Preliminary Geologic Studies Of Sierra El Aguajito (Baja California, Mexico)- A Resurgent-Type Caldera

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Journal Article: Preliminary Geologic Studies Of Sierra El Aguajito (Baja California, Mexico)- A Resurgent-Type Caldera

Abstract
Geologic field studies conducted in the Quaternary volcanic field of Tres Virgenes (State of Baja California Sur, Mexico) revealed the existence of a resurgent caldera. The caldera's eruptive products, the Aguajito sequence, overlie the products of the nearby Reforma caldera (Reforma sequence) whose youngest products have already been dated as Quaternary. The rim of the Aguajito caldera is inferred by the existence of an arcuate alignment of rhyolitic domes. The mean diameter of this subcircular feature is 10 km. The volume of its mapped acidic products is a minimum of 10 km3. Several horizons within the sequence contain shells. K/Ar dates of the ignimbrites and domes of El Aguajito formation confirm that the unit are Pleistocene. The detailed stratigraphy also shows the evolution of a marine regression partly related to the caldera.

Authors 
V. H. Garduno-Monroy, H. Vargas-Ledezma and J. O. Campos-Enriquez








Published Journal 
Journal of Volcanology and Geothermal Research, 1993





DOI 
Not Provided
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Citation

V. H. Garduno-Monroy,H. Vargas-Ledezma,J. O. Campos-Enriquez. 1993. Preliminary Geologic Studies Of Sierra El Aguajito (Baja California, Mexico)- A Resurgent-Type Caldera. Journal of Volcanology and Geothermal Research. (!) .