Conduit convection, magma mixing and melt inclusion trends at persistently degassing volcanoes

F Witham

Research output: Contribution to journalArticle (Academic Journal)peer-review

29 Citations (Scopus)

Abstract

Magmas progressively exsolve volatiles as they ascend towards the Earth's surface, such that their volatile content is a function of pressure. Water and carbon dioxide concentrations measured in melt inclusions from degassing volcanoes rarely coincide with modelled degassing trends. I show that observed melt inclusion trends can be reproduced through mixing of magmas, either during convection within the volcanic conduit, or within a subterranean magma reservoir. No fluxing gas phase or post-entrapment loss of water need be invoked. A permeable network allowing gas transport is still required to avoid fragmentation of magma at shallow depths.
Translated title of the contributionConduit convection, magma mixing and melt inclusion trends at persistently degassing volcanoes
Original languageEnglish
Pages (from-to)345 - 352
Number of pages8
JournalEarth and Planetary Science Letters
Volume301
DOIs
Publication statusPublished - 2011

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