1. Close correlation between Sr/Ca ratios in bulk sediments from the southern Cape Basin and the SPECMAP record.
- Author
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Wien, Katharina, Kölling, Martin, and Schulz, Horst D.
- Subjects
MARINE sediments ,OCEAN ,SEDIMENTATION & deposition ,SUBMARINE geology ,SEDIMENTS - Abstract
High-resolution records of Ca and Sr were obtained from shipboard XRF analyses of bulk sediments in five gravity cores from the southern Cape Basin, South Atlantic Ocean. Sr/Ca ratios display regular glacial/interglacial variations of 14–40% and reveal a close correlation with the SPECMAP record, minimum Sr/Ca ratios appearing during glacial (δ
18 O) maxima, distinct increases during periods of deglaciation, and highest ratios in interstadials. Shifts in carbonate-producing phytoplankton and/or zooplankton assemblages over glacial/interglacial cycles are suggested to be the main cause for the observed variations in Sr/Ca patterns. Quick assessment of the relationship between Sr/Ca ratios and the SPECMAP record made it possible to easily transfer an age model to the newly collected cores already during the cruise. [ABSTRACT FROM AUTHOR]- Published
- 2005
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