Boiteau, Rene; Greaves, Mervyn; Elderfield, Henry (2012): Foraminiferal trace element ratios from South Atlantic sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.825477, Supplement to: Boiteau, R et al. (2012): Authigenic uranium in foraminiferal coatings: A proxy for ocean redox chemistry. Paleoceanography, 27(3), PA3227, https://doi.org/10.1029/2012PA002335
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Abstract:
The rate of uranium accumulation in oceanic sediments from seawater is controlled by bottom water oxygen concentrations and organic carbon fluxes-two parameters that are linked to deep ocean storage of CO2. To investigate glacial-interglacial changes in what is known as authigenic U, we have developed a rapid method for its determination as a simple addition to a procedure for foraminiferal trace element analysis. Foraminiferal calcite acts as a low U substrate (U/Ca < 15 nmol/mol) upon which authigenic U accumulates in reducing sediments. We measured a downcore record of foraminiferal U/Ca from ODP Site 1090 in the South Atlantic and found that U/Ca ratios increase by 70-320 nmol/mol during glacial intervals. There is a significant correlation between U/Ca records of benthic and planktonic foraminiferal species and between U/Ca and bulk sediment authigenic U. These results indicate that elevated U/Ca ratios are attributable to the accumulation of authigenic U coatings in sediments. Foraminiferal Mn/Ca ratios were lower during the glacial intervals, suggesting that the observed U accumulation on the shells is not directly linked to U incorporation into secondary manganese phases. Thus, foraminiferal U/Ca ratios may provide useful information on past changes in sediment redox conditions.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -42.913450 * Median Longitude: 8.750000 * South-bound Latitude: -42.913600 * West-bound Longitude: 8.600000 * North-bound Latitude: -42.913300 * East-bound Longitude: 8.900000
Date/Time Start: 1997-12-28T23:25:00 * Date/Time End: 1997-12-30T00:55:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Boiteau, R; Greaves, M; Elderfield, H (2012): (Table S1) Foraminiferal trace element ratios from ODP 177-1090D and sediment core TTN057-6-PC4. https://doi.org/10.1594/PANGAEA.825475
- Boiteau, R; Greaves, M; Elderfield, H (2012): (Table S2) Foraminiferal U/Ca ratios after different cleaning methods from ODP 177-1090D and sediment core TTN057-6-PC4. https://doi.org/10.1594/PANGAEA.825476