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Palaeoenvironment reconstruction, volcanic evolution and geochronology of the Cerro Blanco subcomplex, Nevados de Chillán Volcanic Complex, central Chile.

Mee, Katy and Gilbert, Jennie S. and McGarvie, David W. and Naranjo, José A. and Pringle, Malcolm (2009) Palaeoenvironment reconstruction, volcanic evolution and geochronology of the Cerro Blanco subcomplex, Nevados de Chillán Volcanic Complex, central Chile. Bulletin of Volcanology, 71 (8). pp. 933-952. ISSN 1432-0819

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Abstract

Nevados de Chillán Volcanic Complex, central Chile, has been active for at least 640 ka—a period spanning a number of glacial and interglacial periods. Geologic mapping, radiometric dating and geochemical analysis have identified six new volcanic units and produced four new 40Ar/39Ar ages for Cerro Blanco, the northern subcomplex of Nevados de Chillán volcano. Compositions range from dacite to basaltic-andesite and a new geologic map is presented. Examination of lava fracture structures on both newly mapped lavas and those mapped during previous studies has enabled interpretations of former eruptive environments. Palaeoenvironment reconstructions, combined with 40Ar/39Ar ages and comparison with the marine oxygen isotope record, show that at least three phases of volcanic activity have occurred during the evolution of Cerro Blanco: (1) a constructive, pre-caldera collapse period; (2) a period of caldera formation and collapse; and (3) a constructive period of dome growth forming the modern day volcanic centre. This style of volcanic evolution, whereby large-scale caldera collapse is followed by growth of a new stratocone is common at Andean volcanoes.

Item Type: Article
Journal or Publication Title: Bulletin of Volcanology
Uncontrolled Keywords: Volcano–ice interaction - Nevados de Chillán - Cerro Blanco - Palaeoenvironment reconstruction - Snow-contact - Caldera-collapse - 40Ar/39Ar dating
Subjects: Q Science > QE Geology
Departments: UNSPECIFIED
ID Code: 30785
Deposited By: Mr Richard Ingham
Deposited On: 03 Dec 2009 14:24
Refereed?: Yes
Published?: Published
Last Modified: 23 Jul 2014 14:50
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/30785

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