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<title lang=en>Subduction of an Active Spreading Ridge Beneath Southern South America: A Review of the Cenozoic Geological Records from the Andean Foreland, Central Patagonia (46–47°S)</title>
<creator>Scalabrino, Bruno</creator>
<creator>Lagabrielle, Yves</creator>
<creator>Ruppelle (de La), A.</creator>
<creator>Malavieille, Jacques</creator>
<creator>Polve, M.</creator>
<creator>Espinoza, Felipe</creator>
<creator>Morata, Diego</creator>
<creator>Suarez, Manuel</creator>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>UMS 831 unité mixte de service (UMS 831) ; Université Paul Sabatier - Toulouse 3 (UPS) - Centre National d'Etudes Spatiales (CNES) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire Midi-Pyrénées (OMP) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<source>Subduction Zone Geodynamics</source>
<contributor>S. Lallemand, F. Funiciello</contributor>
<publisher>Springer-Verlag</publisher>
<identifier>hal-00421053</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00421053</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00421053</source>
<source>S. Lallemand, F. Funiciello. Subduction Zone Geodynamics, Springer-Verlag, pp.227-246, 2009, Frontiers in Earth Sciences, 〈10.1007/978-3-540-87974-9_12〉</source>
<identifier>DOI : 10.1007/978-3-540-87974-9_12</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/978-3-540-87974-9_12</relation>
<language>en</language>
<subject lang=en>Geodynamic model</subject>
<subject lang=en>Compressional to extensional tectonics</subject>
<subject lang=en>Subduction</subject>
<subject lang=en>Cenozoic</subject>
<subject lang=en>Geological records</subject>
<subject lang=en>South Chile Ridge</subject>
<subject lang=en>Central Patagonia</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/bookPart</type>
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<description lang=en>The Chile-Argentina Patagonian Cordillera is a natural laboratory to study the interactions between oceanic and continental lithosphere during the subduction of an active spreading ridge beneath a continent. Subduction of the South Chile spreading ridge, which separates the Nazca plate from the Antarctic plate, started around 15–14 Ma at the southern tip of Patagonia. Presently, the southernmost segment of the Chile Ridge enters the Peru-Chile trench at 46°S, at the site of the Chile Triple Junction (CTJ). We review the main events which occurred on land in the CTJ region (46–47°S), related with processes of ridge subduction. We summarize tectonic, sedimentary, and magmatic features in a 30 Ma-to Present chronological table. A preridge subduction stage, from 30 to 15 Ma, is characterized by the onset and growth of Patagonian relief and by a shift from marine to continental detrital sedimentation in the foreland at 20–22 Ma. The change from pre-ridge subduction to ridge subduction is marked on land by a transition from calc-alkaline to alkaline volcanism, at 14–12 Ma, and by the onset of eruption of very large fl ood basalt provinces (future volcanic plateaus) following rapid erosion of the eastern foreland belt. Post-plateau basaltic volcanism (<4 Ma) is coeval with a period of tectonic and morphological rejuvenation during which the eastern foreland of the Cordillera has been affected by extensional/transtensional tectonics. We place these events in the framework of a tectonomagmatic model involving the opening of slab windows due to both slab tear and ridge axis subduction.</description>
<date>2009-04-01</date>
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