Petrologie et geochimie des basaltes de Murta: Une eruption sous-glaciaire dans les Andes patagoniennes (46°lat. S.), Chili. Relation avec la subduction de la ride du Chili

Translated title of the contribution: Petrology and geochemistry of the Murta basalts: A subglacial eruption in the Patagonian Andes (46°lat. S.), Chile. Relationship with the subduction of the Chile Ridge

Alain Demant, Mauricio Belmar, Francisco Hervé, Robert J. Pankhurst, Manuel Suárez

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The Holocene Murta basalts represent a small volume monogenetic centre located in the northern Patagonian Andes at the latitude of the Chile Triple Junction. These basalts show morphological evidence of subglacial eruption. They are locally porphyritic with large plagioclase feldspar, clinopyroxene and olivine megacrysts. The major- and trace-element concentrations, REE patterns, and isotopic data, distinguish them clearly from the other Holocene arc basalts or the Palaeocene back-arc lavas. Their asthenospheric signature is in accordance with a geodynamic context characterised, since the Miocene, by the subduction of the Chile Ridge below the South American Plate and the progressive development of a slab window.

Translated title of the contributionPetrology and geochemistry of the Murta basalts: A subglacial eruption in the Patagonian Andes (46°lat. S.), Chile. Relationship with the subduction of the Chile Ridge
Original languageFrench
Pages (from-to)795-801
Number of pages7
JournalComptes Rendus de l'Academie de Sciences - Serie IIa: Sciences de la Terre et des Planetes
Volume327
Issue number12
DOIs
Publication statusPublished - Dec 1998

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ocean Engineering

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