Bulletin of Volcanology

, 75:702 | Cite as

Storage and eruption of near-liquidus rhyolite magma at Cordón Caulle, Chile

  • Jonathan M. Castro
  • C. Ian Schipper
  • Sebastian P. Mueller
  • A. S. Militzer
  • Alvaro Amigo
  • Carolina Silva Parejas
  • Dorrit Jacob
Research Article

Abstract

The last three eruptions at the Cordón Caulle volcanic complex, Chile, have been strikingly similar in that they have started with relatively short pre-eruptive warning and produced chemically homogeneous rhyolite to rhyodacite magma with glassy to aphyric texture. These characteristics collectively call for an understanding of the storage conditions leading to the rise and extraction of crystal-poor silicic magma from volcanoes. We have analyzed and experimentally reproduced the mineral assemblage and glass chemistry in rhyolite magma produced in the most recent eruption of Cordón Caulle, and we use these to infer magma storage and ascent conditions. Fe–Ti oxide mineral geothermometry suggests that the rhyolite was stored at ∼870–920 °C. At these temperatures, the phenocryst assemblage (plag∼An37 > cpx + opx > mag + ilm) can be reproduced under H2O-saturated conditions of between 100 and 50 MPa, corresponding to crustal depths between about 2.5 and 5.0 km. The shallow and relatively hot magma storage conditions have implications for the rapid onset, degassing efficiency, and progression from explosive to mixed pyroclastic-effusive eruption style at Cordón Caulle.

Keywords

Cordón Caulle Explosive-effusive volcanism Magma storage Plinian explosion Rhyolite 

Supplementary material

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Jonathan M. Castro
    • 1
  • C. Ian Schipper
    • 2
    • 3
  • Sebastian P. Mueller
    • 1
  • A. S. Militzer
    • 1
  • Alvaro Amigo
    • 4
  • Carolina Silva Parejas
    • 4
  • Dorrit Jacob
    • 1
  1. 1.University of Mainz, Institute of GeosciencesMainzGermany
  2. 2.School of Geography, Environment and Earth SciencesVictoria UniversityWellingtonNew Zealand
  3. 3.Institut des Sciences de la Terre (ISTO), Centre National de la Recherche Scientifique (CNRS), l’Université d’OrléansOrléans Cedex 2France
  4. 4.Servicio Nacional de Geologia y Mineria, Volcano Hazards ProgramSantiagoChile

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