Calcium isotopes link ocean acidification to Aptian–Albian foraminiferal extinctions
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Jonathan Chen1*, Andrew D. Jacobson1, Brian T. Huber2, Kenneth G. MacLeod3, Chuyan Wan1, Anna R. Waldeck1,4, Barbara Balestra2,5, Bradley B. Sageman1 The second-largest extinction event in the evolutionary history of planktic foraminifera occurred at the Aptian–Albian boundary. This extinction may reflect ocean acidification (OA) associated with Oceanic Anoxic Event 1b. As calcium isotope ratios (δ44/40Ca) can track how biocalcification rates respond to OA, we measured δ44/40Ca records for planktic and benthic foraminifera, bulk carbonates, and authigenic calcite across the Aptian– Albian boundary in the South Atlantic. Benthic and bulk δ44/40Ca data display a distinct sequence of negative and positive excursions, similar to δ44/40Ca variations across other OA events. …
摘自《科学》(Science)第393卷 第6810期 · 2026年7月30日。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。