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Long-term magmatic evolution reveals the beginning of a new caldera cycle at Campi Flegrei

Forni, Francesca, Degruyter, Wim ORCID:, Bachmann, Olivier, De Astis, Gianfilippo and Mollo, Silvio 2018. Long-term magmatic evolution reveals the beginning of a new caldera cycle at Campi Flegrei. Science Advances 4 (11) , eaat9401. 10.1126/sciadv.aat9401

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Understanding the mechanisms that control the accumulation of large silicic magma bodies in the upper crust is key to determine the potential of volcanoes to form caldera-forming eruptions. Campi Flegrei is an active and restless volcano, located in one of the most populated regions on Earth, which has produced two cataclysmic caldera-forming eruptions and numerous smaller eruptive events over the last 60,000 years. Here we combine the results of an extensive petrological survey with a thermo-mechanical model to investigate how the magmatic system shifts from frequent, small eruptions to large caldera-forming events. Our data reveal that the most recent eruption of Monte Nuovo is characterized by highly differentiated magmas akin to those that fed the pre-caldera activity and the initial phases of the caldera-forming eruptions. We suggest that this eruption is an expression of a state shift in magma storage conditions, whereby significant amounts of volatiles start to exsolve in the shallow reservoir. The presence of an exsolved gas phase has fundamental consequences for the physical properties of the reservoir and may indicate that a large magma body is currently accumulating underneath Campi Flegrei.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Additional Information: Distributed under a Creative Commons Attribution Non Commercial Licence (CC BY NC)
Publisher: American Association for the Advancement of Science
ISSN: 2375-2548
Date of First Compliant Deposit: 26 October 2018
Date of Acceptance: 12 October 2018
Last Modified: 05 May 2023 14:21

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