Calc-alkaline and alkaline miocene and calc-alkaline recent volcanism in the Southernmost Patagonian Cordillera, Chile

A. Puig, M. Herve, M. Suarez, A. D. Saunders

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

In the southernmost Patagonian Cordillera (south of Lat. 54°45′) previously unrecorded calc-alkaline dacites and andesites, and adjacent alkali-basalts, were dated at 21 and 18 Ma (K-Ar), respectively. In the same area post-glacial low-K calc-alkaline andesites, identified at Isla Cook, represent the southernmost Recent volcanism recorded so far in South America, about 400 km south of Monte Burney, previously known as the southernmost Recent volcano. The association of contemporaneous calc-alkaline and alkali volcanics suggests a subduction-related environment for the Miocene volcanism, and the Recent calc-alkaline volcanics indicate that currently there is a small component of subduction of the Antarctic Plate beneath the South American part of the Scotia Plate.

Original languageEnglish
Pages (from-to)149-163
Number of pages15
JournalJournal of Volcanology and Geothermal Research
Volume21
Issue number1-2
DOIs
Publication statusPublished - 1984

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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