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Explosive style, magma degassing and evolution in the Chaimilla eruption, Villarrica volcano, Southern Andes

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Abstract

Villarrica (Chile) is a basaltic stratovolcano, currently in an open-conduit condition. It now has relatively frequent Strombolian and effusive eruptions, but it had large explosive eruptions in prehistoric times. Among them, the most recent eruption was Chaimilla, which occurred about 3100 years ago and produced deposits that indicate complex, multiphase eruptive dynamics. Significant differences in mineralogy and glass compositions of the erupted scoria suggest the eruption was fed by two distinct magma batches with similar bulk compositions but distinct crystallization and degassing histories. The lower sequence scoria has a complex crystal assemblage with several crystal populations produced by mixing between a relatively degassed magma containing Fo75-79 olivine, normally or reversely zoned plagioclase (An70-94) and augite (type 1 magma), and a subordinate volume of more-primitive and more volatile-rich magma rising from depth (type 2 magma) and carrying normally zoned plagioclase and higher-Mg (Fo81-85) olivine crystals. Type 2 magma was the main component emitted during the larger and more explosive eruptive phase that deposited the upper sequence. The Chaimilla eruption occurred under closed-vent conditions and was fed by water-rich magmas. When compared with the petrological features of the magma currently erupted at Villarrica, which has slightly more-evolved bulk compositions, lower crystal content and lower water content, these results suggest that the evolution in eruptive style of the volcano from highly explosive to a lava lake/Strombolian activity corresponds to significant changes in the shallow plumbing system (which is now at much shallower depths); these plumbing-system changes were not associated with significant changes in the parental magma compositions.

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Acknowledgments

This work was supported by SNFS grants number 200021-116335 and 200021-122268. The authors are grateful to Oulfa Belhadj for her help in the olivine grains preparation for FTIR and micro-Raman analyses and to C. Bouvet de Maisonneuve and Y. Suzuki for fruitful discussions; R. Avanzinelli, K. Cashman and R. Cioni for constructive comments on a previous version of the manuscript; A. Mc Carthy for assistance during microprobe analyses; A. Martigner for assistance during SEM observations and A. Ulianov for assistance during collection and treatment of LA-ICP-MS data. We are also grateful to an anonymous reviewer and M. Clynne for their constructive comments and J. Fierstein and J. White for editorial handling.

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Authors and Affiliations

  1. Departement des Sciences de la Terre, Universitè de Genéve, Rue des Maraîchers 13, 1205, Genéve, Switzerland

    L. Pioli, L. Scalisi, L. Costantini & C. Bonadonna

  2. Observatoire Volcanologique du Piton de la Fournaise, IPGP, La Plaine des Cafres, La Réunion, France

    A. Di Muro

  3. Escuela de Geologia, Universidad Mayor, Providencia, Santiago, Chile

    J. Clavero

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  1. L. Pioli
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Correspondence to L. Pioli.

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Pioli, L., Scalisi, L., Costantini, L. et al. Explosive style, magma degassing and evolution in the Chaimilla eruption, Villarrica volcano, Southern Andes. Bull Volcanol 77, 93 (2015). https://doi.org/10.1007/s00445-015-0976-1

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