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The Loma Seca tuff and the Calabozos caldera: a major ash-flow and caldera complex in the southern Andes of central Chile.

Geological Society of America Bulletin
By: , and 

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Abstract

A composite ring-structure caldera of Late Pleistocene age, 26 X 14km in size, has been discovered and mapped near the Andean crest in central Chile (35o 30'S). Rhyolitic to dacitic zoned ashflow sheets, each representing 150-300 km3 of magma, were erupted 0.8, 0.3 and 0.15 m.y. ago; the youngest of the associated collapses was closely followed by resurgent doming of the caldera floor and the development of a longitudinal graben. Post-caldera eruption of dacite and andesite have persisted into Holocene time and active hot springs are abundant along caldera-marginal and resurgent fault systems, suggesting a significant geothermal energy resource. The ash-flow magmatism has been no less important in this segment of the glaciated S Andes than in the arid central Andes and may well be accounted for by the existence of thicker crust in both regions.- L.H.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title The Loma Seca tuff and the Calabozos caldera: a major ash-flow and caldera complex in the southern Andes of central Chile.
Series title Geological Society of America Bulletin
Volume 95
Issue 1
Year Published 1984
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Geological Society of America Bulletin
First page 45
Last page 54
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