Exceptional eruptive CO2 emissions from intra-plate alkaline magmatism in the Canary volcanic archipelago
2023; Nature Portfolio; Volume: 4; Issue: 1 Linguagem: Inglês
10.1038/s43247-023-01103-x
ISSN2662-4435
AutoresMike Burton, Alessandro Aiuppa, P. Allard, María Asensio‐Ramos, Ana Pardo Cofrades, Alessandro La Spina, Emma J. Nicholson, Vittorio Zanon, José Barrancos, Marcello Bitetto, Margaret E. Hartley, Jorge E. Romero, Emma C. Waters, Alexander G. Stewart, Pedro A. Hernández, João Lages, Eleazar Padrón, Kieran Wood, Ben Esse, Catherine Hayer, Klaudia Cyrzan, Estelle F. Rose‐Koga, Federica Schiavi, Luca D’Auria, Nemesio M. Pérez,
Tópico(s)earthquake and tectonic studies
ResumoAbstract Alkaline mafic magmas forming intra-plate oceanic islands are believed to be strongly enriched in CO 2 due to low-degree partial melting of enriched mantle sources. However, until now, such CO 2 enhancement has not been verified by measuring CO 2 degassing during a subaerial eruption. Here, we provide evidence of highly CO 2 -rich gas emissions during the 86-day 2021 Tajogaite eruption of Cumbre Vieja volcano on La Palma Island, in the Canary archipelago. Our results reveal sustained high plume CO 2 /SO 2 ratios, which, when combined with SO 2 fluxes, melt inclusion volatile contents and magma production rates at explosive and effusive vents, imply a magmatic CO 2 content of 4.5 ± 1.5 wt%. The amount of CO 2 released during the 2021 eruptive activity was 28 ± 14 Mt CO 2 . Extrapolating to the volume of alkaline mafic magmas forming La Palma alone (estimated as 4000 km 3 erupted over 11 Ma), we infer a maximum CO 2 emission into the ocean and atmosphere of 10 16 moles of CO 2 , equivalent to 20% of the eruptive CO 2 emissions from a large igneous province eruption, suggesting that the formation of the Canary volcanic archipelago produced a CO 2 emission of similar magnitude as a large igneous province.
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