Volcanic record of the subduction of an active spreading ridge, Taitao Peninsula (southern Chile)

Research Article| June 01, 1994 Volcanic record of the subduction of an active spreading ridge, Taitao Peninsula (southern Chile) Y. Lagabrielle; Y. Lagabrielle 1Unité de Recherche Associée "Domaines Océaniques," Université de Bretagne Occidentale, 6 Avenue Le Gorgeu, BP 809, 29285 Brest, France Search for other works by this author on: GSW Google Scholar J. Le Moigne; J. Le Moigne 1Unité de Recherche Associée "Domaines Océaniques," Université de Bretagne Occidentale, 6 Avenue Le Gorgeu, BP 809, 29285 Brest, France Search for other works by this author on: GSW Google Scholar R. C. Maury; R. C. Maury 1Unité de Recherche Associée "Domaines Océaniques," Université de Bretagne Occidentale, 6 Avenue Le Gorgeu, BP 809, 29285 Brest, France Search for other works by this author on: GSW Google Scholar J. Cotten; J. Cotten 1Unité de Recherche Associée "Domaines Océaniques," Université de Bretagne Occidentale, 6 Avenue Le Gorgeu, BP 809, 29285 Brest, France Search for other works by this author on: GSW Google Scholar J. Bourgois J. Bourgois 2Laboratoire de Géodynamique, Tectonique et Environnement, Université Pierre et Marie Curie, Boîte 119, 4 Place Jussieu, 75252, Paris Cedex 05, France Search for other works by this author on: GSW Google Scholar Geology (1994) 22 (6): 515–518. https://doi.org/10.1130/0091-7613(1994)022<0515:VROTSO>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Y. Lagabrielle, J. Le Moigne, R. C. Maury, J. Cotten, J. Bourgois; Volcanic record of the subduction of an active spreading ridge, Taitao Peninsula (southern Chile). Geology 1994;; 22 (6): 515–518. doi: https://doi.org/10.1130/0091-7613(1994)022<0515:VROTSO>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract During the Pliocene, the Taitao Peninsula was the locus of the subduction of the Chile active spreading ridge beneath the South American margin. New field data allow us to distinguish within the Taitao ophiolite a genuine ophiolitic body of undetermined age and two volcanic and volcaniclastic units. One unit shows evidence for deposition in a shallow-water environment, and it unconformably overlies the Chilean continental basement. Its established Pliocene age demonstrates that it was deposited during the subduction of the Chile ridge. Lavas from both units include enriched mid-oceanic ridge basalts (MORBs) together with Nb-depleted basalts, andesites, and dacites. La/Nb ratios vary randomly from 1 to 4 in both units and are positively correlated with SiO2 content. These chemical characteristics are consistent with upper-crustal contamination of MORB-type basalts by the Chilean crust as already suggested from isotopic data. We consider these volcanic suites to be the result of eruptions of MORB magmas that originated from the downgoing, shallowly buried, active spreading center and were contaminated during their rise through the Chilean continental basement. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.