Deep CO2 in the end-Triassic Central Atlantic Magmatic Province

Manfredo Capriolo (), Andrea Marzoli, László E. Aradi, Sara Callegaro, Jacopo Dal Corso, Robert J. Newton, Benjamin J. W. Mills, Paul B. Wignall, Omar Bartoli, Don R. Baker, Nasrrddine Youbi, Laurent Remusat, Richard Spiess and Csaba Szabó
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Manfredo Capriolo: University of Padova
Andrea Marzoli: University of Padova
László E. Aradi: Eötvös Loránd University
Sara Callegaro: University of Padova
Jacopo Dal Corso: University of Leeds
Robert J. Newton: University of Leeds
Benjamin J. W. Mills: University of Leeds
Paul B. Wignall: University of Leeds
Omar Bartoli: University of Padova
Don R. Baker: McGill University
Nasrrddine Youbi: Cadi Ayyad University
Laurent Remusat: Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie
Richard Spiess: University of Padova
Csaba Szabó: Eötvös Loránd University

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract Large Igneous Province eruptions coincide with many major Phanerozoic mass extinctions, suggesting a cause-effect relationship where volcanic degassing triggers global climatic changes. In order to fully understand this relationship, it is necessary to constrain the quantity and type of degassed magmatic volatiles, and to determine the depth of their source and the timing of eruption. Here we present direct evidence of abundant CO2 in basaltic rocks from the end-Triassic Central Atlantic Magmatic Province (CAMP), through investigation of gas exsolution bubbles preserved by melt inclusions. Our results indicate abundance of CO2 and a mantle and/or lower-middle crustal origin for at least part of the degassed carbon. The presence of deep carbon is a key control on the emplacement mode of CAMP magmas, favouring rapid eruption pulses (a few centuries each). Our estimates suggest that the amount of CO2 that each CAMP magmatic pulse injected into the end-Triassic atmosphere is comparable to the amount of anthropogenic emissions projected for the 21st century. Such large volumes of volcanic CO2 likely contributed to end-Triassic global warming and ocean acidification.

Date: 2020
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DOI: 10.1038/s41467-020-15325-6

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