Calcium isotopes link ocean acidification to Aptian-Albian foraminiferal extinctions

• 成果类型: Article
• 署名作者: Chen, Jonathan; Jacobson, Andrew D.; Huber, Brian T.; MacLeod, Kenneth G.; Wan, Chuyan; Waldeck, Anna R.; Balestra, Barbara; Sageman, Bradley B.
• 署名单位: Northwestern University; Smithsonian Institution; Smithsonian National Museum of Natural History; University of Missouri System; University of Missouri Columbia; Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania State University - University Park; American University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8075; 1095-9203
• DOI: 10.1126/science.aed9359
• 发表日期: 2026-07-30
• 页码: 527-531
• 关键词: CALCIFICATION; fractionation; turnover; france; SEA

摘要

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 (delta 44/40Ca) can track how biocalcification rates respond to OA, we measured delta 44/40Ca records for planktic and benthic foraminifera, bulk carbonates, and authigenic calcite across the Aptian-Albian boundary in the South Atlantic. Benthic and bulk delta 44/40Ca data display a distinct sequence of negative and positive excursions, similar to delta 44/40Ca variations across other OA events. Planktic delta 44/40Ca values increase markedly, tracking a reduction in calcification rates coincident with decreases in the size, diversity, and shell thickness of planktic foraminifera. These results suggest that OA drove extinctions of planktic foraminifera at the Aptian-Albian boundary.