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,
Domaines
Planète et Univers [physics]
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JGR Solid Earth - 2023 - Colombier - Pre%E2%80%90Eruptive Outgassing and Pressurization and Post%E2%80%90Fragmentation Bubble Nucleation -1.pdf (3.55 Mo)
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