Earth Sciences

Global ocean redox changes before and during the Toarcian Oceanic Anoxic Event

A. Kunert and B. Kendall

This groundbreaking research by Alexandra Kunert and Brian Kendall explores the expansion of ocean anoxia and euxinia during the Toarcian Oceanic Anoxic Event. Discover how redox trends relate to biodiversity patterns, revealing significant shifts in marine environments. Don't miss the insights on rhenium and molybdenum enrichments in organic-rich mudrocks!

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Abstract

This study investigates the global extent of ocean anoxia and euxinia (anoxic and sulfide-rich conditions) before and during the Toarcian Oceanic Anoxic Event (T-OAE) using rhenium (Re) and molybdenum (Mo) enrichments in organic-rich mudrocks. Mass balance models reveal an expansion of up to ~7% total seafloor anoxia, primarily euxinic, at the T-OAE onset, followed by a contraction before the event's end. These redox trends mirror ammonite and foraminiferal biodiversity patterns.

Publisher

Nature Communications

Published On

Feb 13, 2023

Authors

Alexandra Kunert, Brian Kendall

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