Paleomagnetic and rock magnetic parameters, biogenic productivity from marine sediment core ANT28/D3-7, Powell Basin, Eastern Antarctic Peninsula
Description
The data set of the marine sediment core D3-7 from Powell Basin(50 o10.71 W, 62o52.55 S), Eastern Antarctic Peninsula, contain data from analyses of 305 cm core covering the age from recent to 11.5 ka BP. The gravity core was retrieved from 2012 during R/V Xuelong cruise CHINREN ANT28. The goal of this data was a study for the construction of relative paleointensity of geomagnetic field in the Powell Basin and establishment of chronology from it. Dataset 1 contains age model from tie points of RPI and biogenic productivity of proxies. Dataset 2 includes elements used for biogenic productivity on depth and ages. Dataset 3 is the paleomagnetic data in depth. Dataset 4 is the rock magnetic data in depth
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Sediment color was measured with quantitative lightness and the visible light spectrum from 400 to 700 nm on the surface of half cores with hand-held Minolta CM-2002 spectrophotometer with 1 cm interval. A total of twenty nine major elements from Al to Ba were measured on an AVAATECH XRF element scanner at the State Key Laboratory of Marine Geology, Tongji University with 1 cm interval. The above data points are cleaned for core break to eliminate the edge effect. Biogenic productivity proxies are calculated from the above elements, Baxs, Sixs, and Caxs. The method assumes four end members for the three elements, i.e., dominant detrital and biogenic origin with negligible hydrothermal and authigenic contributions. Paleomagnetic samples were oriented with the arrow on the cube pointing downcore and inserted along the center of the working half. These samples are restored in 4 oC repository before measurement. The anisotropy of magnetic susceptibility was measured first on Kappabridge magnetic-susceptibility meter. Alternante field demagnetization and remanence measurements were made on 2G Enterprises cryogenic superconducting magnetometer(model 760). The demagnetization step was 5 mT and 10 mT before and after 30 mT, and the maximum alternate field was 80 mT. Anhysteresis remanence was obtained using 100 mT alternate and 0.05 mT steady fields followed by the same demagnetization steps of natural remanence. Saturation isothermal remanent magnetization was imparted at 1 T, followed by application of reverse field of 0.1 and 0.3 T. S ratios were calculated as S-0.1=(IRM-0.1T+IRM1T)/2IRM1T, S-0.3T=(IRM-0.3T+IRM1T)/2IRM1T. Declination and inclination of remanence were calculated using the principal component anlysis of the PMGSC program(by Randy Enkin). The GGF100k model is exercised according to the original papers. The model contains more than 100 continuous sediment records and applies temporal smoothing kernels to fit both high and low-resolution data.
Institutions
- First Institute of Oceanography