143-million-year seawater osmium isotopic record: Trends, rhythms, and dynamics of volcanism and tectonics

• 成果类型: Article
• 署名作者: Matsumoto, Hironao; Watanabe, Yasuto; Coccioni, Rodolfo; Frontalini, Fabrizio; Yoshimura, Toshihiro; Kuroda, Junichiro; Suzuki, Katsuhiko
• 署名单位: University of Tsukuba; Japan Agency for Marine-Earth Science & Technology (JAMSTEC); National Institute for Environmental Studies - Japan; University of Urbino; University of Urbino; University of Tokyo; Fukushima University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8075; 1095-9203
• DOI: 10.1126/science.adw8301
• 发表日期: 2026-01-22
• 页码: 389-393
• 关键词: MARINE OS-187/OS-188 RECORD; COSMIC DUST FLUX; SEA-WATER; DECCAN VOLCANISM; thermal maximum; ocean; OS; sr; carbon; EVOLUTION

摘要

Tectonic events and volcanic pulses forming large igneous provinces (LIPs) have altered Earth's paleoclimate. Osmium (Os) and strontium (Sr) isotopic ratios are key tracers of past continental weathering and LIP eruptions. However, limited Cretaceous seawater Os and riverine Os-Sr data have hindered quantitative reconstructions. In this study, we present a long-term Os isotopic record from the Cretaceous to the present, revealing similar to 10- to 20-million-year cycles during the Cretaceous that align with rhythmic LIP eruptions. Seawater Os-Sr isotopic trends indicate transitions in continental weathering patterns during the Late Cretaceous [similar to 90 million years ago (Ma)] and Paleogene (similar to 35 Ma) ascribed to intensified weathering of interior Gondwana during the opening of the Atlantic Ocean and the uplift and glaciation of the Himalaya, respectively. Our Os isotopic record highlights its utility in tracing long-term LIP cycles and identifying major paleogeographic turning points.