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27 avril 2023
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info:eu-repo/semantics/altIdentifier/doi/10.1038/s43247-023-00798-2
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info:eu-repo/semantics/altIdentifier/pissn/2662-4435
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info:eu-repo/semantics/altIdentifier/urn/urn:nbn:ch:serval-BIB_EC16986350DC8
info:eu-repo/semantics/openAccess , CC BY 4.0 , https://creativecommons.org/licenses/by/4.0/
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Foraminifers Thalamophora Foraminiferida Foraminiferea Forams Competitive examinations TestsCiter ce document
Arthur Adams et al., « Rapid grain boundary diffusion in foraminifera tests biases paleotemperature records », Serveur académique Lausannois, ID : 10.1038/s43247-023-00798-2
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The oxygen isotopic compositions of fossil foraminifera tests constitute a continuous proxy record of deep-ocean and sea-surface temperatures spanning the last 120 million years. Here, by incubating foraminifera tests in 18O-enriched artificial seawater analogues, we demonstrate that the oxygen isotopic composition of optically translucent, i.e., glassy, fossil foraminifera calcite tests can be measurably altered at low temperatures through rapid oxygen grain-boundary diffusion without any visible ultrastructural changes. Oxygen grain boundary diffusion occurs sufficiently fast in foraminifera tests that, under normal upper oceanic sediment conditions, their grain boundaries will be in oxygen isotopic equilibrium with the surrounding pore fluids on a time scale of