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Magma ascent and degassing at shallow levels

Burgisser, Alain and Degruyter, Wim 2015. Magma ascent and degassing at shallow levels. In: Sigurdsson, Haraldur, Houghton, Bruce, McNutt, Steve, Rymer, Hazel and Stix, John eds. The Encyclopedia of Volcanoes (Second Edition), Elsevier, pp. 225-236. (10.1016/B978-0-12-385938-9.00011-0)

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Abstract

The most dramatic change that magma undergoes while ascending to the surface is volatile loss because of pressure drop. This chapter reviews the main mechanisms by which magma can lose its volatile components to reach the volcanic vent either as a mostly degassed lava that oozes quietly or as a fragmented mixture of gases and particles that explosively rushes out into the atmosphere. These mechanisms include volatile behavior, the formation and evolution of gas bubbles and crystals during ascent, magma rheology, volcanic conduit geometry, and gas escape. Interactions between these mechanisms are explored thanks to a simplified conduit flow model.

Item Type: Book Section
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Uncontrolled Keywords: Exsolution; Gas bubble; Magma degassing; Magma flow; outgassing; Volatiles; Volcanic conduit
Publisher: Elsevier
ISBN: 9780123859389
Last Modified: 04 Jun 2017 09:14
URI: http://orca.cf.ac.uk/id/eprint/92459

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