Pre‐Eruptive Outgassing and Pressurization, and Post‐Fragmentation Bubble Nucleation, Recorded by Vesicles in Breadcrust Bombs From Vulcanian Activity at Guagua Pichincha Volcano, Ecuador - Laboratoire Magmas et Volcans Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research : Solid Earth Année : 2023

Pre‐Eruptive Outgassing and Pressurization, and Post‐Fragmentation Bubble Nucleation, Recorded by Vesicles in Breadcrust Bombs From Vulcanian Activity at Guagua Pichincha Volcano, Ecuador

Résumé

Introduction Vulcanian eruptions are short-lived, discrete explosive volcanic events that can generate high eruptive plumes, ballistic fallout, as well as pyroclastic flows and surges (Clarke et al., 2015; Druitt et al., 2002). One model for conduit processes that lead to Vulcanian activity involves the formation of a dense plug or dome by outgassing, underneath which gas-rich magma is injected with limited volatile loss. Fragmentation and explosions can then be driven by a combination of (a) dome-collapse causing decompression of magma in the conduit and (b) overpressure and brittle-fragmentation of the magmatic foam beneath this plug/dome (Druitt et al., 2002). A fragmentation front propagates downward through this vertically heterogenous conduit. Due to their low volatile content,
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hal-04304944 , version 1 (24-11-2023)

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M. Colombier, M. Manga, H. Wright, B. Bernard, R. Degraffenried, et al.. Pre‐Eruptive Outgassing and Pressurization, and Post‐Fragmentation Bubble Nucleation, Recorded by Vesicles in Breadcrust Bombs From Vulcanian Activity at Guagua Pichincha Volcano, Ecuador. Journal of Geophysical Research : Solid Earth, 2023, 128 (9), ⟨10.1029/2023jb026775⟩. ⟨hal-04304944⟩
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