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

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.
Complete list of metadatas

Cited literature [61 references]  Display  Hide  Download


https://hal-insu.archives-ouvertes.fr/insu-00804471
Contributor : Nathalie Pothier <>
Submitted on : Thursday, March 28, 2013 - 10:42:41 AM
Last modification on : Friday, May 10, 2019 - 1:54:15 PM
Long-term archiving on : Saturday, June 29, 2013 - 4:01:44 AM

Files

Castro_etal_2013_BullVolc.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Jonathan M. Castro, C. Ian Schipper, Sebastian P. Mueller, A.S. Militzer, Alvaro Amigo, et al.. Storage and eruption of near-liquidus rhyolite magma at Cordón Caulle, Chile. Bulletin of Volcanology, Springer Verlag, 2013, 75 (702), pp.1-17. ⟨10.1007/s00445-013-0702-9⟩. ⟨insu-00804471⟩

Share

Metrics

Record views

422

Files downloads

1122