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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 contribution||Conduit convection, magma mixing and melt inclusion trends at persistently degassing volcanoes|
|Pages (from-to)||345 - 352|
|Number of pages||8|
|Journal||Earth and Planetary Science Letters|
|Publication status||Published - 2011|