Contributors: Hartmann, Martin, Müller, Peter J, Suess, Erwin, van der Weijden, Cornelis H

Date: 1976-11-14

Abstract: In the sediments of the NW African continental margin the mainly biogenic carbonate constituents become increasingly diluted with terrigenous material as one approaches the coast, as indicated by the carbonate-CO2 content, the Al2O3/SiO2-ratios, and the presence of ammonia fixed to alumino-silicates, predominantly to illites. In the norther area of the investigation – off Cape Blanc and Cape Bojador . the terrigenous constituents are mainly quartz from the Sahara Desert, whereas in the south – off Senegal – more alumino-silicates as clay minerals are admixed with the carbonate constituents. The organic carbon content of the continental slope sediments off Senegal is higher than in samples of the continental rise or of the preservation of organic matter as a result of high production and relatively rapid sedimentation. The zone of manganese-oxide enrichment follows the redox potential of + 330 mV from the surface (0-5 cm) into the sediments (20-30 cm deep) at 2000--3000 m and 3700 m of water depths, respectively. At shallower water depths, low redox potentials preclude deposition of manganese oxides and cause their mobilization from the sediments. About 1/3 of the total sedimentary Zn and 1/4 of the Cu is associated with the carbonate mineral fraction, probably in calcium phosphate overgrowths as a result of the mineralization of phosphorus-containing organic matter. Besides the precipitation of calcium phosphate, the mineralization of organic matter mediated by bacterial sulfate reduction also results in calcium carbonate precipitation and the exchange of ammonia for potassium on illites. Because of these simultaneous reactions, the depth distribution of all mineralization constituents in the interstitial water can be determined using the actual molar carbon-to-nitrogen-to phosphorus ratios of the sedimentary organic matter. The amount of sulfide sulfur in this process indicates the predominance of bacterial sulfate reduction in the sediments off NW Africa. This process also preferentially decomposes nitrogen- and phosphorus-containing organic compounds so organic matter deficient in these elements is characteristic for the rapidly accumulating sediments than today, indicating there was increased production of organic carbon compounds and more favorable conditions of their preservations. During the last interglacial times conditions were similar to those to today. This differentiation with time has also been observed in sediments from the Argentine Basin and from slope off South India indicating perhaps world-wide environmental changes throughout Late Quaternary times. Category: geoscientificInformation Source: Supplement to: Hartmann, Martin; Müller, Peter J; Suess, Erwin; van der Weijden, Cornelis H (1976): Chemistry of Late Quaternary sediments and their interstitial waters from the northwest African continental margin. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C24, 1-67 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 26.645000 * LONGITUDE: -15.053333 * DATE/TIME: 1971-10-31T00:00:00 * ELEVATION: -2085.0 m * Recovery: 0.4 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 26.838330 * LONGITUDE: -15.110000 * DATE/TIME: 1971-10-31T00:00:00 * ELEVATION: -2820.0 m * Recovery: 3.5 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 23.498333 * LONGITUDE: -18.716667 * DATE/TIME: 1971-11-02T00:00:00 * ELEVATION: -3076.0 m * Recovery: 0.4 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 23.498333 * LONGITUDE: -18.716667 * DATE/TIME: 1971-11-02T00:00:00 * ELEVATION: -3080.0 m * Recovery: 5.57 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 23.131667 * LONGITUDE: -17.735000 * DATE/TIME: 1971-11-06T00:00:00 * ELEVATION: -2037.0 m * Recovery: 0.4 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 23.131667 * LONGITUDE: -17.735000 * DATE/TIME: 1971-11-06T00:00:00 * ELEVATION: -2046.0 m * Recovery: 2.84 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 21.145000 * LONGITUDE: -18.573333 * DATE/TIME: 1971-11-08T00:00:00 * ELEVATION: -2798.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 21.145000 * LONGITUDE: -18.573333 * DATE/TIME: 1971-11-08T00:00:00 * ELEVATION: -2778.0 m * Recovery: 6.19 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 19.371700 * LONGITUDE: -19.930000 * DATE/TIME: 1971-11-09T00:00:00 * ELEVATION: -3315.0 m * Recovery: 0.3 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 19.371700 * LONGITUDE: -19.930000 * DATE/TIME: 1971-11-09T00:00:00 * ELEVATION: -3316.0 m * Recovery: 5 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 19.371700 * LONGITUDE: -18.930000 * DATE/TIME: 1971-11-09T00:00:00 * ELEVATION: -3320.0 m * Recovery: 8.45 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Sphincter corer EVENT LABEL: * LATITUDE: 16.548333 * LONGITUDE: -21.970000 * DATE/TIME: 1971-11-11T00:00:00 * ELEVATION: -3573.0 m * Recovery: 0.16 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 16.548333 * LONGITUDE: -21.970000 * DATE/TIME: 1971-11-11T00:00:00 * ELEVATION: -3568.0 m * Recovery: 1.67 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 16.238333 * LONGITUDE: -20.425000 * DATE/TIME: 1971-11-13T00:00:00 * ELEVATION: -3645.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.953333 * LONGITUDE: -18.133333 * DATE/TIME: 1971-11-14T00:00:00 * ELEVATION: -3094.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.953333 * LONGITUDE: -18.133333 * DATE/TIME: 1971-11-14T00:00:00 * ELEVATION: -3082.0 m * Recovery: 1.43 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 15.316667 * LONGITUDE: -17.091667 * DATE/TIME: 1971-11-16T00:00:00 * ELEVATION: -104.0 m * Recovery: 0.2 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.400000 * LONGITUDE: -17.275000 * DATE/TIME: 1971-11-16T00:00:00 * ELEVATION: -508.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.443333 * LONGITUDE: -17.306667 * DATE/TIME: 1971-01-01T00:00:00 * ELEVATION: -711.0 m * LOCATION: Atlantic Ocean * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.443333 * LONGITUDE: -17.306667 * DATE/TIME: 1971-01-01T00:00:00 * ELEVATION: -625.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 15.480000 * LONGITUDE: -17.360000 * DATE/TIME: 1971-11-17T00:00:00 * ELEVATION: -966.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.825000 * LONGITUDE: -17.861667 * DATE/TIME: 1971-11-17T00:00:00 * ELEVATION: -2710.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.825000 * LONGITUDE: -17.861667 * DATE/TIME: 1971-11-17T00:00:00 * ELEVATION: -2576.0 m * Recovery: 6 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 23.135000 * LONGITUDE: -17.745000 * DATE/TIME: 1971-11-30T00:00:00 * ELEVATION: -2066.0 m * Recovery: 7.5 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: (M12392-1) * LATITUDE: 25.171667 * LONGITUDE: -16.845000 * DATE/TIME: 1971-12-03T00:00:00 * ELEVATION: -2575.0 m * Recovery: 9.5 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer...datasets/GIK12327-4_chemistry_sediment.tab...Chemistry of Late Quaternary sediments and their interstitial waters of sediment cores from the Nort-West African continental margin...Abstract: In the sediments of the NW African continental margin the mainly biogenic carbonate constituents become increasingly diluted with terrigenous material as one approaches the coast, as indicated by the carbonate-CO2 content, the Al2O3/SiO2-ratios, and the presence of ammonia fixed to alumino-silicates, predominantly to illites. In the norther area of the investigation – off Cape Blanc and Cape Bojador . the terrigenous constituents are mainly quartz from the Sahara Desert, whereas in the south – off Senegal – more alumino-silicates as clay minerals are admixed with the carbonate constituents. The organic carbon content of the continental slope sediments off Senegal is higher than in samples of the continental rise or of the preservation of organic matter as a result of high production and relatively rapid sedimentation. The zone of manganese-oxide enrichment follows the redox potential of + 330 mV from the surface (0-5 cm) into the sediments (20-30 cm deep) at 2000--3000 m and 3700 m of water depths, respectively. At shallower water depths, low redox potentials preclude deposition of manganese oxides and cause their mobilization from the sediments. About 1/3 of the total sedimentary Zn and 1/4 of the Cu is associated with the carbonate mineral fraction, probably in calcium phosphate overgrowths as a result of the mineralization of phosphorus-containing organic matter. Besides the precipitation of calcium phosphate, the mineralization of organic matter mediated by bacterial sulfate reduction also results in calcium carbonate precipitation and the exchange of ammonia for potassium on illites. Because of these simultaneous reactions, the depth distribution of all mineralization constituents in the interstitial water can be determined using the actual molar carbon-to-nitrogen-to phosphorus ratios of the sedimentary organic matter. The amount of sulfide sulfur in this process indicates the predominance of bacterial sulfate reduction in the sediments off NW Africa. This process also preferentially decomposes nitrogen- and phosphorus-containing organic compounds so organic matter deficient in these elements is characteristic for the rapidly accumulating sediments than today, indicating there was increased production of organic carbon compounds and more favorable conditions of their preservations. During the last interglacial times conditions were similar to those to today. This differentiation with time has also been observed in sediments from the Argentine Basin and from slope off South India indicating perhaps world-wide environmental changes throughout Late Quaternary times. Category: geoscientificInformation Source: Supplement to: Hartmann, Martin; Müller, Peter J; Suess, Erwin; van der Weijden, Cornelis H (1976): Chemistry of Late Quaternary sediments and their interstitial waters from the northwest African continental margin. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C24, 1-67 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 26.645000 * LONGITUDE: -15.053333 * DATE/TIME: 1971-10-31T00:00:00 * ELEVATION: -2085.0 m * Recovery: 0.4 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 26.838330 * LONGITUDE: -15.110000 * DATE/TIME: 1971-10-31T00:00:00 * ELEVATION: -2820.0 m * Recovery: 3.5 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 23.498333 * LONGITUDE: -18.716667 * DATE/TIME: 1971-11-02T00:00:00 * ELEVATION: -3076.0 m * Recovery: 0.4 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 23.498333 * LONGITUDE: -18.716667 * DATE/TIME: 1971-11-02T00:00:00 * ELEVATION: -3080.0 m * Recovery: 5.57 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 23.131667 * LONGITUDE: -17.735000 * DATE/TIME: 1971-11-06T00:00:00 * ELEVATION: -2037.0 m * Recovery: 0.4 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 23.131667 * LONGITUDE: -17.735000 * DATE/TIME: 1971-11-06T00:00:00 * ELEVATION: -2046.0 m * Recovery: 2.84 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 21.145000 * LONGITUDE: -18.573333 * DATE/TIME: 1971-11-08T00:00:00 * ELEVATION: -2798.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 21.145000 * LONGITUDE: -18.573333 * DATE/TIME: 1971-11-08T00:00:00 * ELEVATION: -2778.0 m * Recovery: 6.19 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 19.371700 * LONGITUDE: -19.930000 * DATE/TIME: 1971-11-09T00:00:00 * ELEVATION: -3315.0 m * Recovery: 0.3 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 19.371700 * LONGITUDE: -19.930000 * DATE/TIME: 1971-11-09T00:00:00 * ELEVATION: -3316.0 m * Recovery: 5 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 19.371700 * LONGITUDE: -18.930000 * DATE/TIME: 1971-11-09T00:00:00 * ELEVATION: -3320.0 m * Recovery: 8.45 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Sphincter corer EVENT LABEL: * LATITUDE: 16.548333 * LONGITUDE: -21.970000 * DATE/TIME: 1971-11-11T00:00:00 * ELEVATION: -3573.0 m * Recovery: 0.16 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 16.548333 * LONGITUDE: -21.970000 * DATE/TIME: 1971-11-11T00:00:00 * ELEVATION: -3568.0 m * Recovery: 1.67 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 16.238333 * LONGITUDE: -20.425000 * DATE/TIME: 1971-11-13T00:00:00 * ELEVATION: -3645.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.953333 * LONGITUDE: -18.133333 * DATE/TIME: 1971-11-14T00:00:00 * ELEVATION: -3094.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.953333 * LONGITUDE: -18.133333 * DATE/TIME: 1971-11-14T00:00:00 * ELEVATION: -3082.0 m * Recovery: 1.43 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 15.316667 * LONGITUDE: -17.091667 * DATE/TIME: 1971-11-16T00:00:00 * ELEVATION: -104.0 m * Recovery: 0.2 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.400000 * LONGITUDE: -17.275000 * DATE/TIME: 1971-11-16T00:00:00 * ELEVATION: -508.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.443333 * LONGITUDE: -17.306667 * DATE/TIME: 1971-01-01T00:00:00 * ELEVATION: -711.0 m * LOCATION: Atlantic Ocean * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.443333 * LONGITUDE: -17.306667 * DATE/TIME: 1971-01-01T00:00:00 * ELEVATION: -625.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 15.480000 * LONGITUDE: -17.360000 * DATE/TIME: 1971-11-17T00:00:00 * ELEVATION: -966.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.825000 * LONGITUDE: -17.861667 * DATE/TIME: 1971-11-17T00:00:00 * ELEVATION: -2710.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.825000 * LONGITUDE: -17.861667 * DATE/TIME: 1971-11-17T00:00:00 * ELEVATION: -2576.0 m * Recovery: 6 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 23.135000 * LONGITUDE: -17.745000 * DATE/TIME: 1971-11-30T00:00:00 * ELEVATION: -2066.0 m * Recovery: 7.5 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: (M12392-1) * LATITUDE: 25.171667 * LONGITUDE: -16.845000 * DATE/TIME: 1971-12-03T00:00:00 * ELEVATION: -2575.0 m * Recovery: 9.5 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer...datasets/GIK12336-1_chemistry_sediment.tab...datasets/GIK12328-5_chemistry_sediment.tab...datasets/GIK12338-2_chemistry_sediment.tab...datasets/GIK12379-1_chemistry_sediment.tab ... Abstract: In the sediments of the NW African continental margin the mainly biogenic carbonate constituents become increasingly diluted with terrigenous material as one approaches the coast, as indicated by the carbonate-CO2 content, the Al2O3/SiO2-ratios, and the presence of ammonia fixed to alumino-silicates, predominantly to illites. In the norther area of the investigation – off Cape Blanc and Cape Bojador . the terrigenous constituents are mainly quartz from the Sahara Desert, whereas in the south – off Senegal – more alumino-silicates as clay minerals are admixed with the carbonate constituents. The organic carbon content of the continental slope sediments off Senegal is higher than in samples of the continental rise or of the preservation of organic matter as a result of high production and relatively rapid sedimentation. The zone of manganese-oxide enrichment follows the redox potential of + 330 mV from the surface (0-5 cm) into the sediments (20-30 cm deep) at 2000--3000 m and 3700 m of water depths, respectively. At shallower water depths, low redox potentials preclude deposition of manganese oxides and cause their mobilization from the sediments. About 1/3 of the total sedimentary Zn and 1/4 of the Cu is associated with the carbonate mineral fraction, probably in calcium phosphate overgrowths as a result of the mineralization of phosphorus-containing organic matter. Besides the precipitation of calcium phosphate, the mineralization of organic matter mediated by bacterial sulfate reduction also results in calcium carbonate precipitation and the exchange of ammonia for potassium on illites. Because of these simultaneous reactions, the depth distribution of all mineralization constituents in the interstitial water can be determined using the actual molar carbon-to-nitrogen-to phosphorus ratios of the sedimentary organic matter. The amount of sulfide sulfur in this process indicates the predominance of bacterial sulfate reduction in the sediments off NW Africa. This process also preferentially decomposes nitrogen- and phosphorus-containing organic compounds so organic matter deficient in these elements is characteristic for the rapidly accumulating sediments than today, indicating there was increased production of organic carbon compounds and more favorable conditions of their preservations. During the last interglacial times conditions were similar to those to today. This differentiation with time has also been observed in sediments from the Argentine Basin and from slope off South India indicating perhaps world-wide environmental changes throughout Late Quaternary times. Category: geoscientificInformation Source: Supplement to: Hartmann, Martin; Müller, Peter J; Suess, Erwin; van der Weijden, Cornelis H (1976): Chemistry of Late Quaternary sediments and their interstitial waters from the northwest African continental margin. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C24, 1-67 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 26.645000 * LONGITUDE: -15.053333 * DATE/TIME: 1971-10-31T00:00:00 * ELEVATION: -2085.0 m * Recovery: 0.4 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 26.838330 * LONGITUDE: -15.110000 * DATE/TIME: 1971-10-31T00:00:00 * ELEVATION: -2820.0 m * Recovery: 3.5 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 23.498333 * LONGITUDE: -18.716667 * DATE/TIME: 1971-11-02T00:00:00 * ELEVATION: -3076.0 m * Recovery: 0.4 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 23.498333 * LONGITUDE: -18.716667 * DATE/TIME: 1971-11-02T00:00:00 * ELEVATION: -3080.0 m * Recovery: 5.57 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 23.131667 * LONGITUDE: -17.735000 * DATE/TIME: 1971-11-06T00:00:00 * ELEVATION: -2037.0 m * Recovery: 0.4 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 23.131667 * LONGITUDE: -17.735000 * DATE/TIME: 1971-11-06T00:00:00 * ELEVATION: -2046.0 m * Recovery: 2.84 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 21.145000 * LONGITUDE: -18.573333 * DATE/TIME: 1971-11-08T00:00:00 * ELEVATION: -2798.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 21.145000 * LONGITUDE: -18.573333 * DATE/TIME: 1971-11-08T00:00:00 * ELEVATION: -2778.0 m * Recovery: 6.19 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 19.371700 * LONGITUDE: -19.930000 * DATE/TIME: 1971-11-09T00:00:00 * ELEVATION: -3315.0 m * Recovery: 0.3 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 19.371700 * LONGITUDE: -19.930000 * DATE/TIME: 1971-11-09T00:00:00 * ELEVATION: -3316.0 m * Recovery: 5 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 19.371700 * LONGITUDE: -18.930000 * DATE/TIME: 1971-11-09T00:00:00 * ELEVATION: -3320.0 m * Recovery: 8.45 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Sphincter corer EVENT LABEL: * LATITUDE: 16.548333 * LONGITUDE: -21.970000 * DATE/TIME: 1971-11-11T00:00:00 * ELEVATION: -3573.0 m * Recovery: 0.16 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 16.548333 * LONGITUDE: -21.970000 * DATE/TIME: 1971-11-11T00:00:00 * ELEVATION: -3568.0 m * Recovery: 1.67 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 16.238333 * LONGITUDE: -20.425000 * DATE/TIME: 1971-11-13T00:00:00 * ELEVATION: -3645.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.953333 * LONGITUDE: -18.133333 * DATE/TIME: 1971-11-14T00:00:00 * ELEVATION: -3094.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.953333 * LONGITUDE: -18.133333 * DATE/TIME: 1971-11-14T00:00:00 * ELEVATION: -3082.0 m * Recovery: 1.43 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 15.316667 * LONGITUDE: -17.091667 * DATE/TIME: 1971-11-16T00:00:00 * ELEVATION: -104.0 m * Recovery: 0.2 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.400000 * LONGITUDE: -17.275000 * DATE/TIME: 1971-11-16T00:00:00 * ELEVATION: -508.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.443333 * LONGITUDE: -17.306667 * DATE/TIME: 1971-01-01T00:00:00 * ELEVATION: -711.0 m * LOCATION: Atlantic Ocean * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.443333 * LONGITUDE: -17.306667 * DATE/TIME: 1971-01-01T00:00:00 * ELEVATION: -625.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 15.480000 * LONGITUDE: -17.360000 * DATE/TIME: 1971-11-17T00:00:00 * ELEVATION: -966.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.825000 * LONGITUDE: -17.861667 * DATE/TIME: 1971-11-17T00:00:00 * ELEVATION: -2710.0 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Box corer (Reineck) EVENT LABEL: * LATITUDE: 15.825000 * LONGITUDE: -17.861667 * DATE/TIME: 1971-11-17T00:00:00 * ELEVATION: -2576.0 m * Recovery: 6 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: * LATITUDE: 23.135000 * LONGITUDE: -17.745000 * DATE/TIME: 1971-11-30T00:00:00 * ELEVATION: -2066.0 m * Recovery: 7.5 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer EVENT LABEL: (M12392-1) * LATITUDE: 25.171667 * LONGITUDE: -16.845000 * DATE/TIME: 1971-12-03T00:00:00 * ELEVATION: -2575.0 m * Recovery: 9.5 m * LOCATION: East Atlantic * CAMPAIGN: M25 * BASIS: Meteor (1964) * DEVICE: Kasten corer

Contributors: Arz, Helge W, Pätzold, Jürgen, Wefer, Gerold

Date: 1999-01-23

South Atlantic in Late Quaternary: Reconstruction of Budget and Currents...Abstract: Detailed 14C AMS data and isotope based stratigraphies from high-resolution paleoceanographic records for the last 22 ka of cores from the upper continental slope off NE Brazil reveal sedimentation rates of up to 100 cm per 1000 yr. Variations in the sediment composition relate to changes in the input of terrigenous material. The sedimentation is controlled by sea level and by the climatic regime of the hinterland. Short-term changes in the tropical wind field may act as a climatic trigger. The zonality of the SE trades was probably increased and the monsoonal activity over Africa reduced during the Younger Dryas period. Category: geoscientificInformation Source: Supplement to: Arz, Helge W; Pätzold, Jürgen; Wefer, Gerold (1999): Climatic changes during the last deglaciation recorded in sediment cores from the northeastern Brazilian Continental Margin. Geo-Marine Letters, 19(3), 209-218, https://doi.org/10.1007/s003670050111 Supplemental Information: For data of sediment cores GeoB3104-1 and GeoB3912-1 see Arz et al. (1998) data sets: doi:10.1594/PANGAEA.711735 Coverage: EVENT LABEL: * LATITUDE: -4.295000 * LONGITUDE: -37.091667 * DATE/TIME: 1995-03-16T00:00:00 * ELEVATION: -800.0 m * Recovery: 5.38 m * LOCATION: NE-Brazilian continental margin * CAMPAIGN: JOPSII-6 * BASIS: Victor Hensen * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -4.613333 * LONGITUDE: -36.636667 * DATE/TIME: 1995-03-18T00:00:00 * ELEVATION: -830.0 m * Recovery: 5.5 m * LOCATION: NE-Brazilian continental margin * CAMPAIGN: JOPSII-6 * BASIS: Victor Hensen * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -7.011667 * LONGITUDE: -34.441667 * DATE/TIME: 1995-03-24T00:00:00 * ELEVATION: -1385.0 m * LOCATION: NE-Brazilian continental margin * CAMPAIGN: JOPSII-6 * BASIS: Victor Hensen * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -4.613333 * LONGITUDE: -36.640000 * DATE/TIME: 1996-03-30T00:00:00 * ELEVATION: -828.0 m * Recovery: 7 m * LOCATION: Northeast Brasilian Margin * CAMPAIGN: M34/4 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)...Element concentrations and stable isotope record of planktonic foraminifera of sediment cores from the northeastern Brazilian Continental Margin...Abstract: Detailed 14C AMS data and isotope based stratigraphies from high-resolution paleoceanographic records for the last 22 ka of cores from the upper continental slope off NE Brazil reveal sedimentation rates of up to 100 cm per 1000 yr. Variations in the sediment composition relate to changes in the input of terrigenous material. The sedimentation is controlled by sea level and by the climatic regime of the hinterland. Short-term changes in the tropical wind field may act as a climatic trigger. The zonality of the SE trades was probably increased and the monsoonal activity over Africa reduced during the Younger Dryas period. Category: geoscientificInformation Source: Supplement to: Arz, Helge W; Pätzold, Jürgen; Wefer, Gerold (1999): Climatic changes during the last deglaciation recorded in sediment cores from the northeastern Brazilian Continental Margin. Geo-Marine Letters, 19(3), 209-218, https://doi.org/10.1007/s003670050111 Supplemental Information: For data of sediment cores GeoB3104-1 and GeoB3912-1 see Arz et al. (1998) data sets: doi:10.1594/PANGAEA.711735 Coverage: EVENT LABEL: * LATITUDE: -4.295000 * LONGITUDE: -37.091667 * DATE/TIME: 1995-03-16T00:00:00 * ELEVATION: -800.0 m * Recovery: 5.38 m * LOCATION: NE-Brazilian continental margin * CAMPAIGN: JOPSII-6 * BASIS: Victor Hensen * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -4.613333 * LONGITUDE: -36.636667 * DATE/TIME: 1995-03-18T00:00:00 * ELEVATION: -830.0 m * Recovery: 5.5 m * LOCATION: NE-Brazilian continental margin * CAMPAIGN: JOPSII-6 * BASIS: Victor Hensen * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -7.011667 * LONGITUDE: -34.441667 * DATE/TIME: 1995-03-24T00:00:00 * ELEVATION: -1385.0 m * LOCATION: NE-Brazilian continental margin * CAMPAIGN: JOPSII-6 * BASIS: Victor Hensen * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -4.613333 * LONGITUDE: -36.640000 * DATE/TIME: 1996-03-30T00:00:00 * ELEVATION: -828.0 m * Recovery: 7 m * LOCATION: Northeast Brasilian Margin * CAMPAIGN: M34/4 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) ... Abstract: Detailed 14C AMS data and isotope based stratigraphies from high-resolution paleoceanographic records for the last 22 ka of cores from the upper continental slope off NE Brazil reveal sedimentation rates of up to 100 cm per 1000 yr. Variations in the sediment composition relate to changes in the input of terrigenous material. The sedimentation is controlled by sea level and by the climatic regime of the hinterland. Short-term changes in the tropical wind field may act as a climatic trigger. The zonality of the SE trades was probably increased and the monsoonal activity over Africa reduced during the Younger Dryas period. Category: geoscientificInformation Source: Supplement to: Arz, Helge W; Pätzold, Jürgen; Wefer, Gerold (1999): Climatic changes during the last deglaciation recorded in sediment cores from the northeastern Brazilian Continental Margin. Geo-Marine Letters, 19(3), 209-218, https://doi.org/10.1007/s003670050111 Supplemental Information: For data of sediment cores GeoB3104-1 and GeoB3912-1 see Arz et al. (1998) data sets: doi:10.1594/PANGAEA.711735 Coverage: EVENT LABEL: * LATITUDE: -4.295000 * LONGITUDE: -37.091667 * DATE/TIME: 1995-03-16T00:00:00 * ELEVATION: -800.0 m * Recovery: 5.38 m * LOCATION: NE-Brazilian continental margin * CAMPAIGN: JOPSII-6 * BASIS: Victor Hensen * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -4.613333 * LONGITUDE: -36.636667 * DATE/TIME: 1995-03-18T00:00:00 * ELEVATION: -830.0 m * Recovery: 5.5 m * LOCATION: NE-Brazilian continental margin * CAMPAIGN: JOPSII-6 * BASIS: Victor Hensen * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -7.011667 * LONGITUDE: -34.441667 * DATE/TIME: 1995-03-24T00:00:00 * ELEVATION: -1385.0 m * LOCATION: NE-Brazilian continental margin * CAMPAIGN: JOPSII-6 * BASIS: Victor Hensen * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -4.613333 * LONGITUDE: -36.640000 * DATE/TIME: 1996-03-30T00:00:00 * ELEVATION: -828.0 m * Recovery: 7 m * LOCATION: Northeast Brasilian Margin * CAMPAIGN: M34/4 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)

Contributors: Brathauer, Uta, Abelmann, Andrea

Date: 1999-01-19

Sea surface temperature reconstructions of sediment cores from the Atlantic sector of the Southern Ocean...South Atlantic in Late Quaternary: Reconstruction of Budget and Currents...Abstract: Late Quaternary summer sea surface temperatures (SSTs) have been derived from radiolarian assemblages in the East Atlantic sector of the Southern Ocean. In the subantarctic and the polar frontal zone, glacial SSTs (oxygen isotope stages 2, 4, 6, and 8) were 3°-5°C cooler than today, indicating northward displacements of the isotherms about 2°-4° of latitudes. During interglacials, SSTs almost reached modern levels (oxygen isotope stages 7 and 9) or exceeded them by 2°-3°C (oxygen isotope stages 1 and 5.5). In the subantarctic Atlantic Ocean, changes in SST and calcium carbonate content of the sediment precede variations in global ice volume in the range of the main Milankovitch frequencies. Comparisons with the timing of North Atlantic Deep Water (NADW) proxy records suggests that this early response in the subantarctic Atlantic Ocean is not triggered by the flux of NADW to the Southern Ocean. Category: geoscientificInformation Source: Supplement to: Brathauer, Uta; Abelmann, Andrea (1999): Late Quaternary variations in sea surface temperatures and their relationship to orbital forcing recorded in the Southern Ocean (Atlantic sector). Paleoceanography, 14(2), 135-148, https://doi.org/10.1029/1998PA900020 Supplemental Information: Not Availble Coverage: EVENT LABEL: (PS16/345) * LATITUDE: -49.013330 * LONGITUDE: -12.700000 * DATE/TIME: 1989-11-18T15:44:00 * ELEVATION: -3407.0 m * Recovery: 12.71 m * LOCATION: Atlantic Ridge * CAMPAIGN: ANT-VIII/3 * BASIS: Polarstern * DEVICE: Gravity corer (Kiel type) EVENT LABEL: (PS18/238) * LATITUDE: -43.220160 * LONGITUDE: 11.738330 * DATE/TIME: 1991-04-03T16:03:00 * ELEVATION: -4610.0 m * Penetration: 15 m * Recovery: 13.91 m * LOCATION: Agulhas Basin * CAMPAIGN: ANT-IX/4 * BASIS: Polarstern * DEVICE: Gravity corer (Kiel type)...Paleoenvironmental Reconstructions from Marine Sediments @ AWI ... Abstract: Late Quaternary summer sea surface temperatures (SSTs) have been derived from radiolarian assemblages in the East Atlantic sector of the Southern Ocean. In the subantarctic and the polar frontal zone, glacial SSTs (oxygen isotope stages 2, 4, 6, and 8) were 3°-5°C cooler than today, indicating northward displacements of the isotherms about 2°-4° of latitudes. During interglacials, SSTs almost reached modern levels (oxygen isotope stages 7 and 9) or exceeded them by 2°-3°C (oxygen isotope stages 1 and 5.5). In the subantarctic Atlantic Ocean, changes in SST and calcium carbonate content of the sediment precede variations in global ice volume in the range of the main Milankovitch frequencies. Comparisons with the timing of North Atlantic Deep Water (NADW) proxy records suggests that this early response in the subantarctic Atlantic Ocean is not triggered by the flux of NADW to the Southern Ocean. Category: geoscientificInformation Source: Supplement to: Brathauer, Uta; Abelmann, Andrea (1999): Late Quaternary variations in sea surface temperatures and their relationship to orbital forcing recorded in the Southern Ocean (Atlantic sector). Paleoceanography, 14(2), 135-148, https://doi.org/10.1029/1998PA900020 Supplemental Information: Not Availble Coverage: EVENT LABEL: (PS16/345) * LATITUDE: -49.013330 * LONGITUDE: -12.700000 * DATE/TIME: 1989-11-18T15:44:00 * ELEVATION: -3407.0 m * Recovery: 12.71 m * LOCATION: Atlantic Ridge * CAMPAIGN: ANT-VIII/3 * BASIS: Polarstern * DEVICE: Gravity corer (Kiel type) EVENT LABEL: (PS18/238) * LATITUDE: -43.220160 * LONGITUDE: 11.738330 * DATE/TIME: 1991-04-03T16:03:00 * ELEVATION: -4610.0 m * Penetration: 15 m * Recovery: 13.91 m * LOCATION: Agulhas Basin * CAMPAIGN: ANT-IX/4 * BASIS: Polarstern * DEVICE: Gravity corer (Kiel type)

Contributors: Esper, Oliver, Zonneveld, Karin A F, Höll, Christine, Karwath, Britta, Schneider, Ralph R, Vink, Annemiek, Weise-Ihlo, Ilka, Willems, Helmut

Date: 2000-03-09

South Atlantic in Late Quaternary: Reconstruction of Budget and Currents...Abundance of calcareous dinoflagellates of sediment cores from the South Atlantic Ocean...Abstract: Despite the increasing interest in the South Atlantic Ocean as a key area of the heat exchange between the southern and the northern hemisphere, information about its palaeoceanographic conditions during transitions from glacial to interglacial stages, the so-called Terminations, are not well understood. Herein we attempt to increase this information by studying the calcareous dinoflagellate cysts and the shells of Thoracosphaera heimii (calcareous cysts) of five Late Quaternary South Atlantic Ocean cores. Extremely high accumulation rates of calcareous cysts at the Terminations might be due to a combined effect of increased cyst production and better preservation as result of calm, oligotrophic conditions in the upper water layers. Low relative abundance of Sphaerodinella albatrosiana compared with Sphaerodinella tuberosa in the Cape Basin may be the result of the relatively colder environmental conditions in this region compared with the equatorial Atlantic Ocean with high relative abundance of S. albatrosiana. Furthermore, the predominance of S. tuberosa during glacials and interglacials at the observed site of the western Atlantic Ocean reflects decreased salinity in the upper water layer. Category: geoscientificInformation Source: Supplement to: Esper, Oliver; Zonneveld, Karin A F; Höll, Christine; Karwath, Britta; Schneider, Ralph R; Vink, Annemiek; Weise-Ihlo, Ilka; Willems, Helmut (2000): Reconstruction of palaeoceanographic conditions in the South Atlantic Ocean at the last two Terminations based on calcareous dinoflagllate cysts. International Journal of Earth Sciences, 88(4), 680-693, https://doi.org/10.1007/s005310050297 Supplemental Information: For data of sediment core GeoB1105-4 see Höll et al. (1998) dataset: doi:10.1594/PANGAEA.55381, sediment core GeoB2204-2 see Höll et al. (1999) dataset: doi:10.1594/PANGAEA.55382 Coverage: EVENT LABEL: * LATITUDE: -1.665000 * LONGITUDE: -12.428330 * DATE/TIME: 1989-02-25T00:00:00 * ELEVATION: -3225.0 m * Penetration: 17 m * Recovery: 15.22 m * LOCATION: Equatorial Atlantic * CAMPAIGN: M9/4 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -3.815000 * LONGITUDE: -14.896660 * DATE/TIME: 1989-03-05T00:00:00 * ELEVATION: -3984.0 m * Penetration: 16 m * Recovery: 15.3 m * LOCATION: Brazil Basin * CAMPAIGN: M9/4 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -24.690000 * LONGITUDE: 7.240000 * DATE/TIME: 1990-03-22T00:00:00 * ELEVATION: -3210.0 m * Recovery: 5.08 m * LOCATION: Cape Basin * CAMPAIGN: M12/1 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -8.528333 * LONGITUDE: -34.021667 * DATE/TIME: 1993-03-22T00:00:00 * ELEVATION: -2072.0 m * Recovery: 8.97 m * LOCATION: Brazil Basin * CAMPAIGN: M23/3 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -35.125000 * LONGITUDE: 17.543333 * DATE/TIME: 1996-01-04T00:00:00 * ELEVATION: -2840.0 m * Recovery: 11.3 m * LOCATION: Southern Cape Basin * CAMPAIGN: M34/1 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) ... Abstract: Despite the increasing interest in the South Atlantic Ocean as a key area of the heat exchange between the southern and the northern hemisphere, information about its palaeoceanographic conditions during transitions from glacial to interglacial stages, the so-called Terminations, are not well understood. Herein we attempt to increase this information by studying the calcareous dinoflagellate cysts and the shells of Thoracosphaera heimii (calcareous cysts) of five Late Quaternary South Atlantic Ocean cores. Extremely high accumulation rates of calcareous cysts at the Terminations might be due to a combined effect of increased cyst production and better preservation as result of calm, oligotrophic conditions in the upper water layers. Low relative abundance of Sphaerodinella albatrosiana compared with Sphaerodinella tuberosa in the Cape Basin may be the result of the relatively colder environmental conditions in this region compared with the equatorial Atlantic Ocean with high relative abundance of S. albatrosiana. Furthermore, the predominance of S. tuberosa during glacials and interglacials at the observed site of the western Atlantic Ocean reflects decreased salinity in the upper water layer. Category: geoscientificInformation Source: Supplement to: Esper, Oliver; Zonneveld, Karin A F; Höll, Christine; Karwath, Britta; Schneider, Ralph R; Vink, Annemiek; Weise-Ihlo, Ilka; Willems, Helmut (2000): Reconstruction of palaeoceanographic conditions in the South Atlantic Ocean at the last two Terminations based on calcareous dinoflagllate cysts. International Journal of Earth Sciences, 88(4), 680-693, https://doi.org/10.1007/s005310050297 Supplemental Information: For data of sediment core GeoB1105-4 see Höll et al. (1998) dataset: doi:10.1594/PANGAEA.55381, sediment core GeoB2204-2 see Höll et al. (1999) dataset: doi:10.1594/PANGAEA.55382 Coverage: EVENT LABEL: * LATITUDE: -1.665000 * LONGITUDE: -12.428330 * DATE/TIME: 1989-02-25T00:00:00 * ELEVATION: -3225.0 m * Penetration: 17 m * Recovery: 15.22 m * LOCATION: Equatorial Atlantic * CAMPAIGN: M9/4 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -3.815000 * LONGITUDE: -14.896660 * DATE/TIME: 1989-03-05T00:00:00 * ELEVATION: -3984.0 m * Penetration: 16 m * Recovery: 15.3 m * LOCATION: Brazil Basin * CAMPAIGN: M9/4 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -24.690000 * LONGITUDE: 7.240000 * DATE/TIME: 1990-03-22T00:00:00 * ELEVATION: -3210.0 m * Recovery: 5.08 m * LOCATION: Cape Basin * CAMPAIGN: M12/1 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -8.528333 * LONGITUDE: -34.021667 * DATE/TIME: 1993-03-22T00:00:00 * ELEVATION: -2072.0 m * Recovery: 8.97 m * LOCATION: Brazil Basin * CAMPAIGN: M23/3 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -35.125000 * LONGITUDE: 17.543333 * DATE/TIME: 1996-01-04T00:00:00 * ELEVATION: -2840.0 m * Recovery: 11.3 m * LOCATION: Southern Cape Basin * CAMPAIGN: M34/1 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)

Contributors: Adegbie, Adesina T, Schneider, Ralph R, Röhl, Ursula, Wefer, Gerold

Date: 2003-04-13

South Atlantic in Late Quaternary: Reconstruction of Budget and Currents...Abstract: Evidence of rapid climatic oscillations like those observed in the Greenland ice cores and sediments from high latitudes of the northern Atlantic have been recognized in the pulses of terrigenous material to continental margin sediments off Cameroon. Fe/Ca ratios used as a parameter to quantify the relative proportions of terrigenous fluxes versus marine carbonate monitor the variability of the west African monsoon. They reveal the history of abrupt changes in precipitation over western and central Africa during the past 52 kyr. These rapid changes are particularly pronounced during the last glacial period and occur at timescales of a few thousand years. Stable oxygen isotope (delta18O) records of Globigerinoides ruber (pink) show high negative values reflecting periods of high monsoon precipitation. The Fe/Ca pattern is very similar to the Dansgaard-Oeschger cycles from the Greenland ice cores. The good correspondence between the warm interstadials of the Dansgaard-Oeschger cycles from the GISP2 ice core records and the high pulses of Fe/Ca sedimentation in our core suggest a strong teleconnection between the low-latitude African climate and the high-latitude northern hemisphere climate oscillations during the last glacial. This climatic link is probably vested in the west African monsoonal fluctuation that alters tropical sea surface temperatures, thermohaline circulations and in turn net export of heat from the south to the north Atlantic, coupled with the variability of the low-latitude southeast trade winds. Category: geoscientificInformation Source: Supplement to: Adegbie, Adesina T; Schneider, Ralph R; Röhl, Ursula; Wefer, Gerold (2003): Glacial millennial-scale fluctuations in central African precipitation recorded in terrigenous sediment supply and freshwater signals offshore Cameroon. Palaeogeography, Palaeoclimatology, Palaeoecology, 197(3-4), 323-333, https://doi.org/10.1016/S0031-0182(03)00474-7 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 2.500000 * LONGITUDE: 9.390000 * DATE/TIME: 1998-03-01T06:48:00 * ELEVATION: -1328.0 m * Recovery: 12.18 m * LOCATION: off Cameroon * CAMPAIGN: M41/1 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)...Chemistry and stable isotope record of sediment core GeoB4905-4...Abstract: Evidence of rapid climatic oscillations like those observed in the Greenland ice cores and sediments from high latitudes of the northern Atlantic have been recognized in the pulses of terrigenous material to continental margin sediments off Cameroon. Fe/Ca ratios used as a parameter to quantify the relative proportions of terrigenous fluxes versus marine carbonate monitor the variability of the west African monsoon. They reveal the history of abrupt changes in precipitation over western and central Africa during the past 52 kyr. These rapid changes are particularly pronounced during the last glacial period and occur at timescales of a few thousand years. Stable oxygen isotope (delta18O) records of Globigerinoides ruber (pink) show high negative values reflecting periods of high monsoon precipitation. The Fe/Ca pattern is very similar to the Dansgaard-Oeschger cycles from the Greenland ice cores. The good correspondence between the warm interstadials of the Dansgaard-Oeschger cycles from the GISP2 ice core records and the high pulses of Fe/Ca sedimentation in our core suggest a strong teleconnection between the low-latitude African climate and the high-latitude northern hemisphere climate oscillations during the last glacial. This climatic link is probably vested in the west African monsoonal fluctuation that alters tropical sea surface temperatures, thermohaline circulations and in turn net export of heat from the south to the north Atlantic, coupled with the variability of the low-latitude southeast trade winds. Category: geoscientificInformation Source: Supplement to: Adegbie, Adesina T; Schneider, Ralph R; Röhl, Ursula; Wefer, Gerold (2003): Glacial millennial-scale fluctuations in central African precipitation recorded in terrigenous sediment supply and freshwater signals offshore Cameroon. Palaeogeography, Palaeoclimatology, Palaeoecology, 197(3-4), 323-333, https://doi.org/10.1016/S0031-0182(03)00474-7 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 2.500000 * LONGITUDE: 9.390000 * DATE/TIME: 1998-03-01T06:48:00 * ELEVATION: -1328.0 m * Recovery: 12.18 m * LOCATION: off Cameroon * CAMPAIGN: M41/1 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) ... Abstract: Evidence of rapid climatic oscillations like those observed in the Greenland ice cores and sediments from high latitudes of the northern Atlantic have been recognized in the pulses of terrigenous material to continental margin sediments off Cameroon. Fe/Ca ratios used as a parameter to quantify the relative proportions of terrigenous fluxes versus marine carbonate monitor the variability of the west African monsoon. They reveal the history of abrupt changes in precipitation over western and central Africa during the past 52 kyr. These rapid changes are particularly pronounced during the last glacial period and occur at timescales of a few thousand years. Stable oxygen isotope (delta18O) records of Globigerinoides ruber (pink) show high negative values reflecting periods of high monsoon precipitation. The Fe/Ca pattern is very similar to the Dansgaard-Oeschger cycles from the Greenland ice cores. The good correspondence between the warm interstadials of the Dansgaard-Oeschger cycles from the GISP2 ice core records and the high pulses of Fe/Ca sedimentation in our core suggest a strong teleconnection between the low-latitude African climate and the high-latitude northern hemisphere climate oscillations during the last glacial. This climatic link is probably vested in the west African monsoonal fluctuation that alters tropical sea surface temperatures, thermohaline circulations and in turn net export of heat from the south to the north Atlantic, coupled with the variability of the low-latitude southeast trade winds. Category: geoscientificInformation Source: Supplement to: Adegbie, Adesina T; Schneider, Ralph R; Röhl, Ursula; Wefer, Gerold (2003): Glacial millennial-scale fluctuations in central African precipitation recorded in terrigenous sediment supply and freshwater signals offshore Cameroon. Palaeogeography, Palaeoclimatology, Palaeoecology, 197(3-4), 323-333, https://doi.org/10.1016/S0031-0182(03)00474-7 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 2.500000 * LONGITUDE: 9.390000 * DATE/TIME: 1998-03-01T06:48:00 * ELEVATION: -1328.0 m * Recovery: 12.18 m * LOCATION: off Cameroon * CAMPAIGN: M41/1 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)

Contributors: Pedersen, Thomas F, Nielsen, B, Pickering, Mark

Date: 1991-09-17

Abstract: High-resolution percent Corg and delta18Oforam records obtained from Panama Basin core Atlantis II 54-25PC and additional data from nearby core P7 show that enhanced burial of organic carbon has characterized every major glacial period for the last 500 kyr in that area. Both Corg concentration and mass accumulation rate profiles exhibit a sawtooth pattern with maxima occurring typically in the later stages of glacial periods. Comparison with dust records suggests that the carbon accumulation rate profile reflects both the upwelling history and a variable rate of iron input during the late Quaternary. The sawtooth character may derive from increased wind velocities and rates of upwelling during glacials which are indirectly related to ice volume (Sarnthein et al., 1988). The rapid decline in export production at the end of glacials in the equatorial Pacific may be attributed to the retreat of ice sheets (thus reduced wind velocities and upwelling) coupled with a coincident decline in atmospheric dust load and/or delivery rate. The Corg accumulation rate profiles do not correlate well with atmospheric CO2 records. For example, atmospheric CO2 was already at a minimum 40 kyr ago when production in the Panama Basin began increasing dramatically, commensurate with an increase in global dust levels. Using the relationship between the degree of photosynthetic fractionation and the concentration of free CO2 in the surface ocean postulated by Popp et al. (1989), delta13Corg measurements made on core P7 show that Panama Basin surface waters have been supplying CO2 to the atmosphere continually for at least the last 50 kyr. There is no evidence for a flux of CO2 into the surface ocean in this area at any time during this period despite the higher production. If the Panama Basin cores are representative of the eastern and central equatorial Pacific, then these observations weaken the influence on CO2 drawdown postulated for increased glacial productivity at low latitudes. Category: geoscientificInformation Source: Supplement to: Pedersen, Thomas F; Nielsen, B; Pickering, Mark (1991): Timing of Late Quaternary productivity pulses in the Panama Basin and implications for atmospheric CO2. Paleoceanography, 6(6), 657-677, https://doi.org/10.1029/91PA02532 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: -4.270000 * LONGITUDE: -85.897000 * ELEVATION: -3225.0 m * CAMPAIGN: ATII_USA * BASIS: Atlantis II (1963) * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 2.604333 * LONGITUDE: -83.986333 * ELEVATION: -3085.0 m * LOCATION: Panama Margin * DEVICE: Core...Abstract: High-resolution percent Corg and delta18Oforam records obtained from Panama Basin core Atlantis II 54-25PC and additional data from nearby core P7 show that enhanced burial of organic carbon has characterized every major glacial period for the last 500 kyr in that area. Both Corg concentration and mass accumulation rate profiles exhibit a sawtooth pattern with maxima occurring typically in the later stages of glacial periods. Comparison with dust records suggests that the carbon accumulation rate profile reflects both the upwelling history and a variable rate of iron input during the late Quaternary. The sawtooth character may derive from increased wind velocities and rates of upwelling during glacials which are indirectly related to ice volume (Sarnthein et al., 1988). The rapid decline in export production at the end of glacials in the equatorial Pacific may be attributed to the retreat of ice sheets (thus reduced wind velocities and upwelling) coupled with a coincident decline in atmospheric dust load and/or delivery rate. The Corg accumulation rate profiles do not correlate well with atmospheric CO2 records. For example, atmospheric CO2 was already at a minimum 40 kyr ago when production in the Panama Basin began increasing dramatically, commensurate with an increase in global dust levels. Using the relationship between the degree of photosynthetic fractionation and the concentration of free CO2 in the surface ocean postulated by Popp et al. (1989), delta13Corg measurements made on core P7 show that Panama Basin surface waters have been supplying CO2 to the atmosphere continually for at least the last 50 kyr. There is no evidence for a flux of CO2 into the surface ocean in this area at any time during this period despite the higher production. If the Panama Basin cores are representative of the eastern and central equatorial Pacific, then these observations weaken the influence on CO2 drawdown postulated for increased glacial productivity at low latitudes. Category: geoscientificInformation Source: Supplement to: Pedersen, Thomas F; Nielsen, B; Pickering, Mark (1991): Timing of Late Quaternary productivity pulses in the Panama Basin and implications for atmospheric CO2. Paleoceanography, 6(6), 657-677, https://doi.org/10.1029/91PA02532 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: -4.270000 * LONGITUDE: -85.897000 * ELEVATION: -3225.0 m * CAMPAIGN: ATII_USA * BASIS: Atlantis II (1963) * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 2.604333 * LONGITUDE: -83.986333 * ELEVATION: -3085.0 m * LOCATION: Panama Margin * DEVICE: Core...Age determination of sediment cores from the Panama Basin ... Abstract: High-resolution percent Corg and delta18Oforam records obtained from Panama Basin core Atlantis II 54-25PC and additional data from nearby core P7 show that enhanced burial of organic carbon has characterized every major glacial period for the last 500 kyr in that area. Both Corg concentration and mass accumulation rate profiles exhibit a sawtooth pattern with maxima occurring typically in the later stages of glacial periods. Comparison with dust records suggests that the carbon accumulation rate profile reflects both the upwelling history and a variable rate of iron input during the late Quaternary. The sawtooth character may derive from increased wind velocities and rates of upwelling during glacials which are indirectly related to ice volume (Sarnthein et al., 1988). The rapid decline in export production at the end of glacials in the equatorial Pacific may be attributed to the retreat of ice sheets (thus reduced wind velocities and upwelling) coupled with a coincident decline in atmospheric dust load and/or delivery rate. The Corg accumulation rate profiles do not correlate well with atmospheric CO2 records. For example, atmospheric CO2 was already at a minimum 40 kyr ago when production in the Panama Basin began increasing dramatically, commensurate with an increase in global dust levels. Using the relationship between the degree of photosynthetic fractionation and the concentration of free CO2 in the surface ocean postulated by Popp et al. (1989), delta13Corg measurements made on core P7 show that Panama Basin surface waters have been supplying CO2 to the atmosphere continually for at least the last 50 kyr. There is no evidence for a flux of CO2 into the surface ocean in this area at any time during this period despite the higher production. If the Panama Basin cores are representative of the eastern and central equatorial Pacific, then these observations weaken the influence on CO2 drawdown postulated for increased glacial productivity at low latitudes. Category: geoscientificInformation Source: Supplement to: Pedersen, Thomas F; Nielsen, B; Pickering, Mark (1991): Timing of Late Quaternary productivity pulses in the Panama Basin and implications for atmospheric CO2. Paleoceanography, 6(6), 657-677, https://doi.org/10.1029/91PA02532 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: -4.270000 * LONGITUDE: -85.897000 * ELEVATION: -3225.0 m * CAMPAIGN: ATII_USA * BASIS: Atlantis II (1963) * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 2.604333 * LONGITUDE: -83.986333 * ELEVATION: -3085.0 m * LOCATION: Panama Margin * DEVICE: Core

Contributors: Francois, Roger, Frank, Martin, Rutgers van der Loeff, Michiel M, Bacon, Michael P

Date: 2004-05-03

Abstract: There is increasing evidence indicating that syndepositional redistribution of sediment on the seafloor by bottom currents is common and can significantly affect sediment mass accumulation rates. Notwithstanding its common incidence, this process (generally referred to as sediment focusing) is often difficult to recognize. If redistribution is near synchronous to deposition, the stratigraphy of the sediment is not disturbed and sediment focusing can easily be overlooked. Ignoring it, however, can lead to serious misinterpretations of sedimentary fluxes, particularly when past changes in export flux from the overlying water are inferred. In many instances, this problem can be resolved, at least for sediments deposited during the late Quaternary, by normalizing to the flux of 230Th scavenged from seawater, which is nearly constant and equivalent to the known rate of production of 230Th from the decay of dissolved 234U. We review the principle, advantages and limitations of this method. Notwithstanding its limitations, it is clear that 230Th normalization does provide a means of achieving more accurate interpretations of sedimentary fluxes and eliminates the risk of serious misinterpretations of sediment mass accumulation rates. Category: geoscientificInformation Source: Supplement to: Francois, Roger; Frank, Martin; Rutgers van der Loeff, Michiel M; Bacon, Michael P (2004): 230Th-normalization: an essential tool for interpreting sedimentary fluxes during the late Quaternary. Paleoceanography, 19, PA1018, https://doi.org/10.1029/2003PA000939 Supplemental Information: Not Availble Coverage: EVENT LABEL: (PS22/817) * LATITUDE: -59.788330 * LONGITUDE: -42.683330 * DATE/TIME: 1992-09-13T18:24:00 * ELEVATION: -4323.0 m * Penetration: 18 m * Recovery: 11.54 m * LOCATION: Scotia Sea * CAMPAIGN: ANT-X/5 * BASIS: Polarstern * DEVICE: Gravity corer (Kiel type)...Radionuclide analyses, and sedimentation and accumulation rates of sediment core PS2319-1 ... Abstract: There is increasing evidence indicating that syndepositional redistribution of sediment on the seafloor by bottom currents is common and can significantly affect sediment mass accumulation rates. Notwithstanding its common incidence, this process (generally referred to as sediment focusing) is often difficult to recognize. If redistribution is near synchronous to deposition, the stratigraphy of the sediment is not disturbed and sediment focusing can easily be overlooked. Ignoring it, however, can lead to serious misinterpretations of sedimentary fluxes, particularly when past changes in export flux from the overlying water are inferred. In many instances, this problem can be resolved, at least for sediments deposited during the late Quaternary, by normalizing to the flux of 230Th scavenged from seawater, which is nearly constant and equivalent to the known rate of production of 230Th from the decay of dissolved 234U. We review the principle, advantages and limitations of this method. Notwithstanding its limitations, it is clear that 230Th normalization does provide a means of achieving more accurate interpretations of sedimentary fluxes and eliminates the risk of serious misinterpretations of sediment mass accumulation rates. Category: geoscientificInformation Source: Supplement to: Francois, Roger; Frank, Martin; Rutgers van der Loeff, Michiel M; Bacon, Michael P (2004): 230Th-normalization: an essential tool for interpreting sedimentary fluxes during the late Quaternary. Paleoceanography, 19, PA1018, https://doi.org/10.1029/2003PA000939 Supplemental Information: Not Availble Coverage: EVENT LABEL: (PS22/817) * LATITUDE: -59.788330 * LONGITUDE: -42.683330 * DATE/TIME: 1992-09-13T18:24:00 * ELEVATION: -4323.0 m * Penetration: 18 m * Recovery: 11.54 m * LOCATION: Scotia Sea * CAMPAIGN: ANT-X/5 * BASIS: Polarstern * DEVICE: Gravity corer (Kiel type)

Contributors: Andrews, John T

Date: 1987-07-23

Abstract: Piston cores from fiords, shelf troughs, and the deep-sea off eastern Baffin Island, N.W.T., Canada, have been sampled for texture and detrital carbonate in the sediments consist primarily of silty clays usually containing sediment accumulation (kg/m**2/ka) over the last ca. 10 ka. Three sets, of two cores each, lie on a fiord-shelf transect and thus define variations in sediment accumulation gradients. These continental margin data are compared with cruder estimates of Holocene sediment accumulation at three sites farther offshore in Baffin Bay, Davis Strait and the northern Labrador Sea. Minimum accumulation in a 2 ka interval was 200 kg/m2 with a maximum estimate of 8,800 kg/m2. Detrital carbonate accumulation varies between 0 and 1,300 kg/m**2. Median accumulation for a typical fiord-shelf-deep-sea transect over the last 10 ka have been 10,340, 3493 and 820 kg/m**2. At DSDP Leg, site 645 in central Baffin Bay, the sedimentation rate ranged between 40 and 130 m/Ma (ca. 400 and 1200 kg/m**2/2ka); that is, comparable with the Late Quaternary input into Baffin Bay. Category: geoscientificInformation Source: Supplement to: Andrews, John T (1987): Late Quaternary marine sediment accumulation in fjord-shelf-deep-sea transects, Baffin Island to Baffin Bay. Quaternary Science Reviews, 6(3-4), 231-243, https://doi.org/10.1016/0277-3791(87)90006-0 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 62.766667 * LONGITUDE: -59.366667 * ELEVATION: -1057.0 m * Recovery: 7 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 70.706667 * LONGITUDE: -64.978333 * ELEVATION: -2041.0 m * Recovery: 7.03 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 61.850833 * LONGITUDE: -64.200500 * ELEVATION: -487.0 m * Recovery: 3.15 m * LOCATION: Baffin Shelf * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 62.834167 * LONGITUDE: -67.034000 * ELEVATION: -570.0 m * Recovery: 9.69 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 71.217000 * LONGITUDE: -71.484667 * ELEVATION: -832.0 m * Recovery: 5.81 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 68.250833 * LONGITUDE: -65.201500 * ELEVATION: -457.0 m * Recovery: 5.93 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 71.083330 * LONGITUDE: -71.883330 * ELEVATION: -683.0 m * Recovery: 10.16 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 69.191667 * LONGITUDE: -68.391667 * ELEVATION: -487.0 m * Recovery: 11.41 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 66.555000 * LONGITUDE: -61.710000 * ELEVATION: -146.0 m * Recovery: 7.7 m * LOCATION: Baffin Bay...Abstract: Piston cores from fiords, shelf troughs, and the deep-sea off eastern Baffin Island, N.W.T., Canada, have been sampled for texture and detrital carbonate in the sediments consist primarily of silty clays usually containing sediment accumulation (kg/m**2/ka) over the last ca. 10 ka. Three sets, of two cores each, lie on a fiord-shelf transect and thus define variations in sediment accumulation gradients. These continental margin data are compared with cruder estimates of Holocene sediment accumulation at three sites farther offshore in Baffin Bay, Davis Strait and the northern Labrador Sea. Minimum accumulation in a 2 ka interval was 200 kg/m2 with a maximum estimate of 8,800 kg/m2. Detrital carbonate accumulation varies between 0 and 1,300 kg/m**2. Median accumulation for a typical fiord-shelf-deep-sea transect over the last 10 ka have been 10,340, 3493 and 820 kg/m**2. At DSDP Leg, site 645 in central Baffin Bay, the sedimentation rate ranged between 40 and 130 m/Ma (ca. 400 and 1200 kg/m**2/2ka); that is, comparable with the Late Quaternary input into Baffin Bay. Category: geoscientificInformation Source: Supplement to: Andrews, John T (1987): Late Quaternary marine sediment accumulation in fjord-shelf-deep-sea transects, Baffin Island to Baffin Bay. Quaternary Science Reviews, 6(3-4), 231-243, https://doi.org/10.1016/0277-3791(87)90006-0 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 62.766667 * LONGITUDE: -59.366667 * ELEVATION: -1057.0 m * Recovery: 7 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 70.706667 * LONGITUDE: -64.978333 * ELEVATION: -2041.0 m * Recovery: 7.03 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 61.850833 * LONGITUDE: -64.200500 * ELEVATION: -487.0 m * Recovery: 3.15 m * LOCATION: Baffin Shelf * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 62.834167 * LONGITUDE: -67.034000 * ELEVATION: -570.0 m * Recovery: 9.69 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 71.217000 * LONGITUDE: -71.484667 * ELEVATION: -832.0 m * Recovery: 5.81 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 68.250833 * LONGITUDE: -65.201500 * ELEVATION: -457.0 m * Recovery: 5.93 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 71.083330 * LONGITUDE: -71.883330 * ELEVATION: -683.0 m * Recovery: 10.16 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 69.191667 * LONGITUDE: -68.391667 * ELEVATION: -487.0 m * Recovery: 11.41 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 66.555000 * LONGITUDE: -61.710000 * ELEVATION: -146.0 m * Recovery: 7.7 m * LOCATION: Baffin Bay...Late Quaternary sediment accumulation in the Baffin Bay ... Abstract: Piston cores from fiords, shelf troughs, and the deep-sea off eastern Baffin Island, N.W.T., Canada, have been sampled for texture and detrital carbonate in the <2 mm fraction. The sediments consist primarily of silty clays usually containing <5% sand. Estimates are made for sediment accumulation (kg/m**2/ka) over the last ca. 10 ka. Three sets, of two cores each, lie on a fiord-shelf transect and thus define variations in sediment accumulation gradients. These continental margin data are compared with cruder estimates of Holocene sediment accumulation at three sites farther offshore in Baffin Bay, Davis Strait and the northern Labrador Sea. Minimum accumulation in a 2 ka interval was 200 kg/m2 with a maximum estimate of 8,800 kg/m2. Detrital carbonate accumulation varies between 0 and 1,300 kg/m**2. Median accumulation for a typical fiord-shelf-deep-sea transect over the last 10 ka have been 10,340, 3493 and 820 kg/m**2. At DSDP Leg, site 645 in central Baffin Bay, the sedimentation rate ranged between 40 and 130 m/Ma (ca. 400 and 1200 kg/m**2/2ka); that is, comparable with the Late Quaternary input into Baffin Bay. Category: geoscientificInformation Source: Supplement to: Andrews, John T (1987): Late Quaternary marine sediment accumulation in fjord-shelf-deep-sea transects, Baffin Island to Baffin Bay. Quaternary Science Reviews, 6(3-4), 231-243, https://doi.org/10.1016/0277-3791(87)90006-0 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 62.766667 * LONGITUDE: -59.366667 * ELEVATION: -1057.0 m * Recovery: 7 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 70.706667 * LONGITUDE: -64.978333 * ELEVATION: -2041.0 m * Recovery: 7.03 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 61.850833 * LONGITUDE: -64.200500 * ELEVATION: -487.0 m * Recovery: 3.15 m * LOCATION: Baffin Shelf * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 62.834167 * LONGITUDE: -67.034000 * ELEVATION: -570.0 m * Recovery: 9.69 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 71.217000 * LONGITUDE: -71.484667 * ELEVATION: -832.0 m * Recovery: 5.81 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 68.250833 * LONGITUDE: -65.201500 * ELEVATION: -457.0 m * Recovery: 5.93 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 71.083330 * LONGITUDE: -71.883330 * ELEVATION: -683.0 m * Recovery: 10.16 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 69.191667 * LONGITUDE: -68.391667 * ELEVATION: -487.0 m * Recovery: 11.41 m * LOCATION: Baffin Bay * DEVICE: Piston corer EVENT LABEL: * LATITUDE: 66.555000 * LONGITUDE: -61.710000 * ELEVATION: -146.0 m * Recovery: 7.7 m * LOCATION: Baffin Bay

Contributors: Niewöhner, Christine, Hensen, Christian, Kasten, Sabine, Zabel, Matthias, Schulz, Horst D

Date: 1998-01-13

Methane and hydrogen sulfide in porewater of sediment cores from the upwelling area off Namibia...Abstract: Porewater concentrations of sulfate, methane, and other relevant constituents were determined on four sediment cores from the high productivity upwelling area off Namibia which were recovered from the continental slope at water depths of 1300 and 2000 m. At all four stations a distinct sulfate-methane transition zone was observed several meters below the seafloor in which both sulfate and methane are consumed. Nutrient porewater concentration profiles do not show gradient slope changes at the depths of the transition zones. Flux calculations carried out on the basis of the determined porewater profiles revealed that anaerobic methane oxidation accounts for 100% of deep sulfate reduction within the sulfate-methane transition zone and consumes the total net diffusive sulfate flux. A significant contribution of organic carbon oxidation to the reduction of sulfate at these depths could, therefore, be excluded. We state that porewater profiles of sulfate with constant gradients above the transition zones are indicative for anaerobic methane oxidation controlling sulfate reduction. Category: geoscientificInformation Source: Supplement to: Niewöhner, Christine; Hensen, Christian; Kasten, Sabine; Zabel, Matthias; Schulz, Horst D (1998): Deep sulfate reduction completely mediated by anaerobic methane oxidation in sediments of the upwelling area off Namibia. Geochimica et Cosmochimica Acta, 62(3), 455-464, https://doi.org/10.1016/S0016-7037(98)00055-6 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: -25.518333 * LONGITUDE: 13.230000 * DATE/TIME: 1996-01-31T00:00:00 * ELEVATION: -1369.0 m * Recovery: 11.36 m * LOCATION: Northern Cape Basin * CAMPAIGN: M34/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -21.623333 * LONGITUDE: 12.191667 * DATE/TIME: 1996-02-03T00:00:00 * ELEVATION: -1353.0 m * LOCATION: Northern Cape Basin * CAMPAIGN: M34/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -17.160000 * LONGITUDE: 10.998333 * DATE/TIME: 1996-02-07T00:00:00 * ELEVATION: -2060.0 m * Recovery: 12.41 m * LOCATION: Northern Cape Basin * CAMPAIGN: M34/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -24.893333 * LONGITUDE: 13.163333 * DATE/TIME: 1996-02-11T00:00:00 * ELEVATION: -1312.0 m * Recovery: 13.71 m * LOCATION: Northern Cape Basin * CAMPAIGN: M34/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)...South Atlantic in Late Quaternary: Reconstruction of Budget and Currents ... Abstract: Porewater concentrations of sulfate, methane, and other relevant constituents were determined on four sediment cores from the high productivity upwelling area off Namibia which were recovered from the continental slope at water depths of 1300 and 2000 m. At all four stations a distinct sulfate-methane transition zone was observed several meters below the seafloor in which both sulfate and methane are consumed. Nutrient porewater concentration profiles do not show gradient slope changes at the depths of the transition zones. Flux calculations carried out on the basis of the determined porewater profiles revealed that anaerobic methane oxidation accounts for 100% of deep sulfate reduction within the sulfate-methane transition zone and consumes the total net diffusive sulfate flux. A significant contribution of organic carbon oxidation to the reduction of sulfate at these depths could, therefore, be excluded. We state that porewater profiles of sulfate with constant gradients above the transition zones are indicative for anaerobic methane oxidation controlling sulfate reduction. Category: geoscientificInformation Source: Supplement to: Niewöhner, Christine; Hensen, Christian; Kasten, Sabine; Zabel, Matthias; Schulz, Horst D (1998): Deep sulfate reduction completely mediated by anaerobic methane oxidation in sediments of the upwelling area off Namibia. Geochimica et Cosmochimica Acta, 62(3), 455-464, https://doi.org/10.1016/S0016-7037(98)00055-6 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: -25.518333 * LONGITUDE: 13.230000 * DATE/TIME: 1996-01-31T00:00:00 * ELEVATION: -1369.0 m * Recovery: 11.36 m * LOCATION: Northern Cape Basin * CAMPAIGN: M34/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -21.623333 * LONGITUDE: 12.191667 * DATE/TIME: 1996-02-03T00:00:00 * ELEVATION: -1353.0 m * LOCATION: Northern Cape Basin * CAMPAIGN: M34/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -17.160000 * LONGITUDE: 10.998333 * DATE/TIME: 1996-02-07T00:00:00 * ELEVATION: -2060.0 m * Recovery: 12.41 m * LOCATION: Northern Cape Basin * CAMPAIGN: M34/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -24.893333 * LONGITUDE: 13.163333 * DATE/TIME: 1996-02-11T00:00:00 * ELEVATION: -1312.0 m * Recovery: 13.71 m * LOCATION: Northern Cape Basin * CAMPAIGN: M34/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)

Contributors: Breitzke, Monika, Grobe, Hannes, Kuhn, Gerhard, Müller, Peter J

Date: 1996-03-13

Physical properties and sedimentology on core GeoB1510-1...South Atlantic in Late Quaternary: Reconstruction of Budget and Currents...Abstract: Detailed information about the sediment properties and microstructure can be provided through the analysis of digital ultrasonic P wave seismograms recorded automatically during full waveform core logging. The physical parameter which predominantly affects the elastic wave propagation in water-saturated sediments is the P wave attenuation coefficient. The related sedimentological parameter is the grain size distribution. A set of high-resolution ultrasonic transmission seismograms (ca. 50-500 kHz), which indicate downcore variations in the grain size by their signal shape and frequency content, are presented. Layers of coarse-grained foraminiferal ooze can be identified by highly attenuated P waves, whereas almost unattenuated waves are recorded in fine-grained areas of nannofossil ooze. Color-encoded pixel graphics of the seismograms and instantaneous frequencies present full waveform images of the lithology and attenuation. A modified spectral difference method is introduced to determine the attenuation coefficient and its power law a = kfn. Applied to synthetic seismograms derived using a "constant Q" model, even low attenuation coefficients can be quantified. A downcore analysis gives an attenuation log which ranges from ca. 700 dB/m at 400 kHz and a power of n = 1-2 in coarse-grained sands to few decibels per meter and n sediment cores. Journal of Geophysical Research: Solid Earth, 101(B10), 22123-22142, https://doi.org/10.1029/96JB01891 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 4.723333 * LONGITUDE: -36.511000 * DATE/TIME: 1991-05-07T00:00:00 * ELEVATION: -4391.0 m * Recovery: 9.89 m * LOCATION: Brazil Basin * CAMPAIGN: M16/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -30.451667 * LONGITUDE: -38.801667 * DATE/TIME: 1994-07-30T00:00:00 * ELEVATION: -3927.0 m * Recovery: 8.19 m * LOCATION: Rio Grande Rise * CAMPAIGN: M29/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) ... Abstract: Detailed information about the sediment properties and microstructure can be provided through the analysis of digital ultrasonic P wave seismograms recorded automatically during full waveform core logging. The physical parameter which predominantly affects the elastic wave propagation in water-saturated sediments is the P wave attenuation coefficient. The related sedimentological parameter is the grain size distribution. A set of high-resolution ultrasonic transmission seismograms (ca. 50-500 kHz), which indicate downcore variations in the grain size by their signal shape and frequency content, are presented. Layers of coarse-grained foraminiferal ooze can be identified by highly attenuated P waves, whereas almost unattenuated waves are recorded in fine-grained areas of nannofossil ooze. Color-encoded pixel graphics of the seismograms and instantaneous frequencies present full waveform images of the lithology and attenuation. A modified spectral difference method is introduced to determine the attenuation coefficient and its power law a = kfn. Applied to synthetic seismograms derived using a "constant Q" model, even low attenuation coefficients can be quantified. A downcore analysis gives an attenuation log which ranges from ca. 700 dB/m at 400 kHz and a power of n = 1-2 in coarse-grained sands to few decibels per meter and n <= 0.5 in fine-grained clays. A least squares fit of a second degree polynomial describes the mutual relationship between the mean grain size and the attenuation coefficient. When it is used to predict the mean grain size, an almost perfect coincidence with the values derived from sedimentological measurements is achieved. Category: geoscientificInformation Source: Supplement to: Breitzke, Monika; Grobe, Hannes; Kuhn, Gerhard; Müller, Peter J (1996): Full waveform ultrasonic transmission seismograms: a fast new method for the determination of physical and sedimentological parameters of marine sediment cores. Journal of Geophysical Research: Solid Earth, 101(B10), 22123-22142, https://doi.org/10.1029/96JB01891 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 4.723333 * LONGITUDE: -36.511000 * DATE/TIME: 1991-05-07T00:00:00 * ELEVATION: -4391.0 m * Recovery: 9.89 m * LOCATION: Brazil Basin * CAMPAIGN: M16/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type) EVENT LABEL: * LATITUDE: -30.451667 * LONGITUDE: -38.801667 * DATE/TIME: 1994-07-30T00:00:00 * ELEVATION: -3927.0 m * Recovery: 8.19 m * LOCATION: Rio Grande Rise * CAMPAIGN: M29/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)