Mid-Cretaceous marine Os isotope evidence for heterogeneous cause of oceanic anoxic events.

ABSTRACT: During the mid-Cretaceous, the Earth experienced several environmental perturbations, including an extremely warm climate and Oceanic Anoxic Events (OAEs). Submarine volcanic episodes associated with formation of large igneous provinces (LIPs) may have triggered these perturbations. The osmium isotopic ratio (¹⁸⁷Os/¹⁸⁸Os) is a suitable proxy for tracing hydrothermal activity associated with the LIPs formation, but ¹⁸⁷Os/¹⁸⁸Os data from the mid-Cretaceous are limited to short time intervals. Here we provide a continuous high-resolution marine ¹⁸⁷Os/¹⁸⁸Os record covering all mid-Cretaceous OAEs. Several OAEs (OAE1a, Wezel and Fallot events, and OAE2) correspond to unradiogenic ¹⁸⁷Os/¹⁸⁸Os shifts, suggesti

SUBMITTER: Matsumoto H 

PROVIDER: S-EPMC8752794 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature