A century of ongoing silicic volcanism at Cordon Caulle, Chile: New constraints on the magmatic system involved in the 1921-1922, 1960 and 2011-2012 eruptions

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dc.contributor.authorSeropian, Gilles
dc.contributor.authorSchipper, C. Ian
dc.contributor.authorHarmon, Lydia J.
dc.contributor.authorSmithies, Sarah L.
dc.contributor.authorKennedy, Ben M.
dc.contributor.authorCastro, Jonathan M.
dc.contributor.authorAlloway, Brent, V
dc.contributor.authorForte, Pablo
dc.date.accessioned2025-01-20T22:04:26Z
dc.date.available2025-01-20T22:04:26Z
dc.date.issued2021
dc.description.abstractCordon Caulle in southern Chile has produced three dacitic to rhyolitic fissure eruptions over the past century (in 1921-1922, 1960 and 2011-2012), and thereby provides an ideal opportunity to examine the architecture of its underlying silicic system. While the 2011-2012 eruption has been extensively studied, comparatively little is known about the 1921-1922 and 1960 events. Major-element matrix glass analyses from the 1960 products (71.5 wt.% SiO2) are indistinguishable from the 2011-2012 data (72.2 wt.% SiO2), but the 1921-1922 analyses form a discrete, slightly less evolved sub-population (69.0 wt.% SiO2). We utilise rhyolite-MELTS geobarometry to estimate both the storage and extraction depths of all three magmas. For all three eruptions, magma was stored in the shallow crust, between 80-150 MPa (3.5-6.6 km). The 2011-2012 magma body spanned this whole depth range but the 1921-1922 and 1960 magma bodies were more confined in pressure, at 90-112 MPa (4.0-5.0 km) and 123-143 MPa (5.4-6.3 km) respectively. Melt extraction from a parental crystal-mush occurred in the range 70-200 MPa (3.1-9.0 km) for all three eruptions, suggesting contiguous melt segregation and storage in the shallow crust. Finally, we discuss whether the deeper magma storage in 1960 reflects the influence of a seismic trigger by events associated with the Mw9.5 Great Chilean earthquake. (C) 2021 The Author(s). Published by Elsevier B.V.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.jvolgeores.2021.107406
dc.identifier.eissn1872-6097
dc.identifier.issn0377-0273
dc.identifier.urihttps://doi.org/10.1016/j.jvolgeores.2021.107406
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94088
dc.identifier.wosidWOS:000723175100005
dc.language.isoen
dc.revistaJournal of volcanology and geothermal research
dc.rightsacceso restringido
dc.subjectCordon Caulle
dc.subjectGeobarometry
dc.subjectRhyolite-MELTS
dc.subjectSilicic volcano
dc.subjectGeochemistry
dc.subjectSeismically-triggered
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleA century of ongoing silicic volcanism at Cordon Caulle, Chile: New constraints on the magmatic system involved in the 1921-1922, 1960 and 2011-2012 eruptions
dc.typeartículo
dc.volumen420
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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