An 18,000 year-long eruptive record from Volcán Chaitén, northwestern Patagonia: Paleoenvironmental and hazard-assessment implications

Show simple item record Alloway, Brent en Pearce, NJG en Moreno, PI en Villarosa, G en Jara, I en De Pol-Holz, R en Outes, V en 2017-08-09T00:56:12Z en 2017-05-12 en 2017-07-15 en
dc.identifier.citation Quaternary Science Reviews, 168:151-181 15 Jul 2017 en
dc.identifier.issn 0277-3791 en
dc.identifier.uri en
dc.description.abstract The 2008 eruption of Volcán Chaitén (VCha) in northwestern Patagonia was the first explosive rhyolitic eruption to have occurred within a century and provided an unprecedented scientific opportunity to examine all facets of the eruption ranging from magma rheology/ascent rates to ash-fall effects on biota and infrastructure. Up to very recently it was thought that the latest eruption prior to the 2008 event occurred c. 9750 cal. a BP. Although a number of researchers have recognised additional eruptive products, but their stratigraphy, age, and geochemical attributes have not been systematically described and/or recorded. In this study, we provide a detailed examination of andic cover-beds and tephra-bearing lake sequences located both proximally and distally to VCha, which record a series of hitherto unknown rhyolitic eruptive products and place all previous observations firmly within a coherent stratigraphic framework. Through major- and trace-element glass shard geochemistry we are able to confidently verify eruptive source. A total of 20 discrete tephra beds are recognised, with at least 10 having widespread areal distributions and/or depositional imprints broadly comparable to, or greater than, the 2008-tephra event. This record indicates that VCha has been continuously but intermittently active as far back as the end of the Last Glacial Maximum (c. 18,000 cal a BP) with two dominant, genetically related magma types and an intermediary ‘mixed’ type. Before this the eruptive record has been largely obscured and/or erased by widespread Andean piedmont glaciation. However, based on the tempo of VCha activity over the last c. 18,000 years, older VCha eruptives can be anticipated to occur as well as future hazardous explosive events. The new eruptive inventory will ultimately be useful for correlating equivalent-aged sequences and refining long-term eruptive tempo as well as corresponding temporal changes in magmatic evolution. en
dc.language English en
dc.publisher Elsevier en
dc.relation.ispartofseries Quaternary Science Reviews en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from en
dc.rights.uri en
dc.title An 18,000 year-long eruptive record from Volcán Chaitén, northwestern Patagonia: Paleoenvironmental and hazard-assessment implications en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.quascirev.2017.05.011 en
pubs.begin-page 151 en
pubs.volume 168 en
dc.rights.holder Copyright: Elsevier en en
pubs.end-page 181 en
pubs.publication-status Published en
dc.rights.accessrights en
pubs.subtype Article en
pubs.elements-id 628622 en
dc.identifier.eissn 1873-457X en
pubs.record-created-at-source-date 2017-08-09 en 2017-05-24 en

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