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GEOREF RECORD

Early Holocene collapse of Volcan Parinacota, Central Andes, Chile; volcanological and paleohydrological consequences

Brian R. Jicha, Benjamin J. C. Laabs, John M. Hora, Brad S. Singer and Marc W. Caffee
Early Holocene collapse of Volcan Parinacota, Central Andes, Chile; volcanological and paleohydrological consequences
Geological Society of America Bulletin (May 2015) 127 (11-12): 1681-1688

Abstract

The catastrophic gravitational collapse of the Old Cone of Volcan Parinacota produced a 6 km (super 3) debris avalanche that traveled approximately 22 km and covered more than 150 km (super 2) . The Upper Lauca drainage, a broad high-altitude basin in the Chilean Altiplano, was permanently altered by the collapse. Although the eruptive history of Parinacota before and after the debris avalanche is well known from petrologic and geochronologic studies, previous age limits on the debris avalanche (based on multiple chronometers) span ca. 8-20 ka. New cosmogenic surface-exposure ages from boulders atop the deposit are based on a regionally calibrated production rate of in situ (super 10) Be and indicate that the avalanche occurred at 8.8 + or - 0.5 ka. These data demonstrate that cosmogenic (super 10) Be surface-exposure dating can be successfully applied to quartz-bearing, volcanic debris avalanche deposits, and that this method offers a distinct advantage over (super 14) C chronologies that provide only minimum or maximum age limits. The 8.8 ka exposure age for the debris avalanche (1) agrees with (super 14) C age limits of paleosol material incorporated in the debris avalanche, (2) requires a voluminous initial phase of postcollapse volcanism with an eruptive rate exceeding that of recent cone-building episodes at most continental arc volcanoes, and (3) suggests that volcano collapse did not result in the formation of Lago Chungara, but instead led to a major expansion of a preexisting closed basin.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 127
Serial Issue: 11-12
Title: Early Holocene collapse of Volcan Parinacota, Central Andes, Chile; volcanological and paleohydrological consequences
Affiliation: University of Wisconsin, Madison, Department of Geoscience, Madison, WI, United States
Pages: 1681-1688
Published: 20150507
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Number of pages: unpaginated
References: 42
Accession Number: 2015-049867
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch map
S18°15'00" - S18°10'00", W69°19'60" - W69°10'00"
Secondary Affiliation: State University of New York, Geneseo, USA, United StatesUniversitaet Goettingen, DEU, GermanyPurdue University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201523
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