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Response of deep-sea benthic foraminifera to Late Quaternary climate changes, southeast Indian Ocean, offshore Western Australia
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Abstract: The ratio between the clay minerals kaolinite and chlorite has been investigated in high resolution in a late Quaternary sediment core from the central Aegean Sea. The record spans the last ca. 105 ka. The kaolinite/chlorite ratio was used to reconstruct the fine-grained aeolian dust influx from the North African deserts, mainly derived from desiccated lake depressions. It therewith can be used as a proxy for wind activity, aridity and vegetation cover in the source area. The data document three major humid phases in North Africa bracketing the formation of sapropel layers S4, S3 and S1. They occur at >105-95 ka, 83.5-72 ka and 14-2 ka. The first two phases are characterised by relatively abrupt lower and upper boundaries suggesting a non-linear response of vegetation to precipitation, with critical hydrological thresholds. In contrast, the onset and termination of the last humid period were more gradual. Highest kaolinite/chlorite ratios indicating strongest aeolian transport and aridity occur during Marine Isotope Stage (MIS) 5b, at ca. 95-84 ka. The long-term decrease in kaolinite/chlorite ratios during the last glacial period indicates a gradual decline of deflatable lake sediments in the source areas. Category: geoscientificInformation Source: Supplement to: Ehrmann, Werner; Seidel, Martin; Schmiedl, Gerhard (2013): Dynamics of Late Quaternary North African humid periods documented in the clay mineral record of central Aegean Sea sediments. Global and Planetary Change, 107, 186-195, https://doi.org/10.1016/j.gloplacha.2013.05.010 Supplemental Information: Not Availble Coverage: EVENT LABEL: (GeoTü SL143) * LATITUDE: 38.261830 * LONGITUDE: 25.103170 * ELEVATION: -665.0 m * LOCATION: Aegean Sea * DEVICE: Gravity corer (Kiel type)
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Response of deep-sea benthic foraminifera to Late Quaternary climate changes, southeast Indian Ocean, offshore Western Australia
Data Types:
  • Tabular Data
South Atlantic in Late Quaternary: Reconstruction of Budget and Currents
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  • Tabular Data
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Response of deep-sea benthic foraminifera to Late Quaternary climate changes, southeast Indian Ocean, offshore Western Australia
Data Types:
  • Tabular Data
Response of deep-sea benthic foraminifera to Late Quaternary climate changes, southeast Indian Ocean, offshore Western Australia
Data Types:
  • Tabular Data
Late Quaternary coccolith assemblages from the south-eastern South Atlantic Ocean: implications for the palaeoceanographic evolution of the Benguela and Agulhas Current systems during the past 250 kyr... South Atlantic in Late Quaternary: Reconstruction of Budget and Currents
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  • Tabular Data
Late Quaternary coccolith assemblages from the south-eastern South Atlantic Ocean: implications for the palaeoceanographic evolution of the Benguela and Agulhas Current systems during the past 250 kyr... South Atlantic in Late Quaternary: Reconstruction of Budget and Currents
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  • Tabular Data
Late Quaternary coccolith assemblages from the south-eastern South Atlantic Ocean: implications for the palaeoceanographic evolution of the Benguela and Agulhas Current systems during the past 250 kyr... South Atlantic in Late Quaternary: Reconstruction of Budget and Currents
Data Types:
  • Tabular Data
Sea-surface Temperature Estimations using a Modern Analog Technique with Foraminiferal Assemblages from Western Atlantic Quaternary Sediments... South Atlantic in Late Quaternary: Reconstruction of Budget and Currents
Data Types:
  • Tabular Data