Valanginian climate cooling and environmental change driven by Paraná-Etendeka basalt erosion

Percival, L.M.E.; Ownsworth, E.; Robinson, S.A.; Selby, D.; Goderis, S.; Claeys, P.

Abstract

The Valanginian Weissert Event (ca. 134 Ma) has long been linked to emplacement of the Paraná-Etendeka large igneous province (LIP). Although several Mesozoic crises were triggered by volcanic CO2 emissions and global warming, causing oceanic oxygen depletion, the Weissert Event featured climate cooling and limited marine anoxia. Here, the impact of silicate weathering on environmental change during the Weissert Event is investigated by presenting the first osmium isotope (187Os/188Os) data sets for the late Berriasian–Valanginian interval. These records document a possible rise in weathering and nutrient runoff during the latest Berriasian, followed by a switch to Paraná-Etendeka basalt erosion during the Valanginian. The high weatherability of LIP basalts enhanced global silicate weathering despite limited coeval climate warming. This weathering triggered the documented cooling, with consequent micronutrient runoff potentially aiding ocean fertilization, highlighting a mechanism linking LIP formation with environmental change that was uniquely different than that of other Mesozoic crises.

Citation

Percival, L., Ownsworth, E., Robinson, S., Selby, D., Goderis, S., & Claeys, P. (2023). Valanginian climate cooling and environmental change driven by Paraná-Etendeka basalt erosion. Geology, 51(8), 753-757. https://doi.org/10.1130/g51202.1

• Journal Article Type: Article
• Acceptance Date: May 16, 2023
• Online Publication Date: Jun 2, 2023
• Publication Date: 2023-08
• Deposit Date: Nov 20, 2023
• Publicly Available Date: Nov 20, 2023
• Journal: Geology
• Print ISSN: 0091-7613
• Electronic ISSN: 1943-2682
• Publisher: Geological Society of America
• Peer Reviewed: Peer Reviewed
• Volume: 51
• Issue: 8
• Pages: 753-757
• DOI: https://doi.org/10.1130/g51202.1
• Public URL: https://durham-repository.worktribe.com/output/1944492