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Transient shallow reservoirs beneath small eruptive centres: Constraints from Mg-Fe interdiffusion in olivine

Authordc.contributor.authorMorgado, E. 
Authordc.contributor.authorParada Reyes, Miguel 
Authordc.contributor.authorMorgan, D. J. 
Authordc.contributor.authorGutiérrez, F. 
Authordc.contributor.authorCastruccio, A. 
Authordc.contributor.authorContreras, C. 
Cita de ítemdc.identifier.citationJournal of Volcanology and Geothermal Research, Volumen 347, pp. 327-336, 2017
Abstractdc.description.abstractSmall eruptive centres commonly have more primitive lavas than those associated with stratovolcanoes, an observation that has been taken to indicate a short magma residence in the crust relative to those reservoirs below stratovolcanoes. The Caburgua cones of the Andean Southern Volcanic Zone from a basaltic small eruptive centre where this can be tested. Here, we use MELTS simulations, and the available thermobarometry data to determine the conditions of olivine crystal rim formation and the Mg-Fe diffusion modelling to determine the magma residence times of those rims in the crust Results yield timescales varying from a few days to dozens of days, and if freezing is to be avoided, can only be explained by some form of storage or slow transport through at least one shallow magma body. The longest durations of magma residence seen in the olivine rim zones are up to 471 days. These timescales are shorter than those estimated (decadal) from the nearby, more-differentiated, and well-established stratovolcano, Villarrica, which has a dominantly basaltic andesite composition. For Caburgua cones, we propose the existence of a transient reservoir, in contrast to a long-lived reservoir such as that inferred beneath the adjacent Villarrica stratovolcano.
Type of licensedc.rightsAttribution-NonCommercial-NoDerivs 3.0 Chile
Link to Licensedc.rights.uri
Sourcedc.sourceJournal of Volcanology and Geothermal Research
Keywordsdc.subjectGeochemistry and Petrology
Títulodc.titleTransient shallow reservoirs beneath small eruptive centres: Constraints from Mg-Fe interdiffusion in olivine
Document typedc.typeArtículo de revista
Indexationuchile.indexArtículo de publicación SCOPUS

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Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Chile