Crystal and melt inclusion timescales reveal the evolution of magma migration before eruption

Dawn C.S. Ruth, Costa Fidel, Caroline Bouvet de Maisonneuve, Luis Franco, Joaquin Cortes, Eliza S. Calder

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Abstract

Volatile element concentrations measured in melt inclusions are a key tool used to understand magma migration and degassing, although their original values may be affected by different re-equilibration processes. Additionally, the inclusion-bearing crystals can have a wide range of origins and ages, further complicating the interpretation of magmatic processes. To clarify some of these issues, here we combined olivine diffusion chronometry and melt inclusion data from the 2008 eruption of Llaima volcano (Chile). We found that magma intrusion occurred about 4 years before the eruption at a minimum depth of approximately 8 km. Magma migration and reaction became shallower with time, and about 6 months before the eruption magma reached 3–4 km depth. This can be linked to reported seismicity and ash emissions. Although some ambiguities of interpretation still remain, crystal zoning and melt inclusion studies allow a more complete understanding of magma ascent, degassing, and volcano monitoring data.
Original languageEnglish
Article number2657
JournalNature Communications
Volume9
Issue number1
Early online date9 Jul 2018
DOIs
Publication statusPublished - 1 Dec 2018

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