Massive methane fluxing from magma–sediment interaction in the end-Triassic Central Atlantic Magmatic Province

Manfredo Capriolo (), Andrea Marzoli (), László E. Aradi, Michael R. Ackerson, Omar Bartoli, Sara Callegaro, Jacopo Dal Corso, Marcia Ernesto, Eleonora M. Gouvêa Vasconcellos, Angelo De Min, Robert J. Newton and Csaba Szabó
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Manfredo Capriolo: University of Padova
Andrea Marzoli: University of Padova
László E. Aradi: Eötvös Loránd University
Michael R. Ackerson: National Museum of Natural History, Smithsonian Institution
Omar Bartoli: University of Padova
Sara Callegaro: University of Oslo
Jacopo Dal Corso: China University of Geosciences
Marcia Ernesto: University of São Paulo
Eleonora M. Gouvêa Vasconcellos: Geology Postgraduate Program of the Federal University of Paraná
Angelo De Min: University of Trieste
Robert J. Newton: University of Leeds
Csaba Szabó: Eötvös Loránd University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Exceptional magmatic events coincided with the largest mass extinctions throughout Earth’s history. Extensive degassing from organic-rich sediments intruded by magmas is a possible driver of the catastrophic environmental changes, which triggered the biotic crises. One of Earth’s largest magmatic events is represented by the Central Atlantic Magmatic Province, which was synchronous with the end-Triassic mass extinction. Here, we show direct evidence for the presence in basaltic magmas of methane, generated or remobilized from the host sedimentary sequence during the emplacement of this Large Igneous Province. Abundant methane-rich fluid inclusions were entrapped within quartz at the end of magmatic crystallization in voluminous (about 1.0 × 106 km3) intrusions in Brazilian Amazonia, indicating a massive (about 7.2 × 103 Gt) fluxing of methane. These micrometre-sized imperfections in quartz crystals attest an extensive release of methane from magma–sediment interaction, which likely contributed to the global climate changes responsible for the end-Triassic mass extinction.

Date: 2021
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DOI: 10.1038/s41467-021-25510-w

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