Brachiopod taxa and shell portions reliably recording past ocean environments: Toward establishing a robust paleoceanographic proxy

Details Brachiopod taxa and shell portions reliably recording past ocean environments: Toward establishing a robust paleoceanographic proxy Brachiopod taxa and shell portions reliably recording past ocean environments: Toward establishing a robust paleoceanographic proxy

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3813601y&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 13, CiteID L13601

Computer Science

Sound

1

Biogeosciences: Biosignatures And Proxies, Biogeosciences: Isotopic Composition And Chemistry (1041, 4870), Biogeosciences: Paleoclimatology And Paleoceanography (3344, 4900)

Scientific paper

Fossils of rhynchonelliform brachiopods (marine invertebrates) constitute ˜70% of the samples used for delineating a well-known Phanerozoic trend in oxygen isotope composition (δ18O) of low-Mg calcite shells. The trend represents secular variations in temperature and/or δ18O of ancient seawater. However, the use of brachiopods as a paleoceanographic proxy is based on the presupposition that the shell calcite is precipitated in isotopic equilibrium with ambient seawater. Here, we show that high-resolution time series of the shell δ18O values along the maximum growth axes of two long-lived cool-water brachiopods are identical to, greater than, or less than those of calcite precipitated in isotopic equilibrium with ambient seawater, depending on the difference in shell growth rates. Coupled with δ18O data from subtropical and warm-temperate brachiopod species examined in our previous studies, we provide a sound framework illustrating which taxa and shell portions reliably recorded past ocean environments.

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