The late Neogene 87Sr/86Sr isotopic record in the western Arabian Sea, Site 722

C. J. Beets

The late Neogene ⁸⁷Sr/⁸⁶Sr isotopic record in the western Arabian Sea, Site 722

Earth and Climate

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Abstract

Continuous magnetostratigraphy and biostratigraphy made it possible to construct a detailed late Neogene record of ⁸⁷Sr/⁸⁶Sr isotopic ratios of ocean water, as measured in the tests of planktonic foraminifers. The late Miocene to Recent is marked by rapidly increasing ⁸⁷Sr/⁸⁶Sr ratios in seawater, which results in a chronostratigraphical resolution varying from 0.2 Ma to 1.5 Ma. The ⁸⁷Sr/⁸⁶Sr seawater curve has a stepwise character. Periods of rapid increase in the ⁸⁷Sr/⁸⁶Sr isotopic ratio of seawater are correlated with important changes in tectonic and climatic conditions. Experiments showed that bulk carbonate sediment samples have differing ⁸⁷Sr/⁸⁶Sr ratios from those of planktonic and benthic foraminifers from the same depth. -from Author

Original language	English
Pages (from-to)	459-463
Number of pages	5
Journal	Proceedings of the Ocean Drilling Program. Scientific Results
Publication status	Published - 1 Jan 1991

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AB - Continuous magnetostratigraphy and biostratigraphy made it possible to construct a detailed late Neogene record of 87Sr/86Sr isotopic ratios of ocean water, as measured in the tests of planktonic foraminifers. The late Miocene to Recent is marked by rapidly increasing 87Sr/86Sr ratios in seawater, which results in a chronostratigraphical resolution varying from 0.2 Ma to 1.5 Ma. The 87Sr/86Sr seawater curve has a stepwise character. Periods of rapid increase in the 87Sr/86Sr isotopic ratio of seawater are correlated with important changes in tectonic and climatic conditions. Experiments showed that bulk carbonate sediment samples have differing 87Sr/86Sr ratios from those of planktonic and benthic foraminifers from the same depth. -from Author

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The late Neogene ⁸⁷Sr/⁸⁶Sr isotopic record in the western Arabian Sea, Site 722

Abstract

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