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A scenario for late Neogene Andean shortening transfer in the Camisea Subandean zone (Peru, 12 S): Implications for growth of the northern Andean Plateau

2011; Geological Society of America; Volume: 123; Issue: 9-10 Linguagem: Inglês

10.1130/b30165.1

1943-2674

Nicolás Espurt, Jocelyn Barbarand, Martín Roddaz, Stéphane Brusset, Patrice Baby, Marianne Saillard, W. Hermoza,

Geochemistry and Geologic Mapping

Research Article| September 01, 2011 A scenario for late Neogene Andean shortening transfer in the Camisea Subandean zone (Peru, 12°S): Implications for growth of the northern Andean Plateau Nicolas Espurt; Nicolas Espurt † 1Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement, UMR Centre Nationale de la Recherche Scientifique 6635, Aix-Marseille Université, Europôle de l'Arbois, BP80, F-13545 Aix-en-Provence cedex 04, France †E-mail: espurt@cerege.fr Search for other works by this author on: GSW Google Scholar Jocelyn Barbarand; Jocelyn Barbarand 2Université Paris Sud, UMR Centre Nationale de la Recherche Scientifique 8148, Interactions et Dynamique des Environnements de Surface, Bâtiment 504, Orsay cedex, F-91405, France Search for other works by this author on: GSW Google Scholar Martin Roddaz; Martin Roddaz 3Université de Toulouse, Université Paul Sabatier (Sciences de la Vie et de la Terre-Observatoire Midi-Pyrénées), Institut de Recherche pour le Développement, Centre National de la Recherche Scientifique, Géosciences Environnement Toulouse, 14 Avenue Edouard Belin, F-31400 Toulouse, France Search for other works by this author on: GSW Google Scholar Stéphane Brusset; Stéphane Brusset 3Université de Toulouse, Université Paul Sabatier (Sciences de la Vie et de la Terre-Observatoire Midi-Pyrénées), Institut de Recherche pour le Développement, Centre National de la Recherche Scientifique, Géosciences Environnement Toulouse, 14 Avenue Edouard Belin, F-31400 Toulouse, France Search for other works by this author on: GSW Google Scholar Patrice Baby; Patrice Baby 3Université de Toulouse, Université Paul Sabatier (Sciences de la Vie et de la Terre-Observatoire Midi-Pyrénées), Institut de Recherche pour le Développement, Centre National de la Recherche Scientifique, Géosciences Environnement Toulouse, 14 Avenue Edouard Belin, F-31400 Toulouse, France Search for other works by this author on: GSW Google Scholar Marianne Saillard; Marianne Saillard 3Université de Toulouse, Université Paul Sabatier (Sciences de la Vie et de la Terre-Observatoire Midi-Pyrénées), Institut de Recherche pour le Développement, Centre National de la Recherche Scientifique, Géosciences Environnement Toulouse, 14 Avenue Edouard Belin, F-31400 Toulouse, France Search for other works by this author on: GSW Google Scholar Wilber Hermoza Wilber Hermoza § 4PERUPETRO S.A., Avenida Luis Aldana 320, San Boja, Lima 41, Peru §Current address: REPSOL-YPF, Paseo de la Castellana 280, 28046 Madrid, Spain. Search for other works by this author on: GSW Google Scholar GSA Bulletin (2011) 123 (9-10): 2050–2068. https://doi.org/10.1130/B30165.1 Article history received: 08 Sep 2009 received: 03 Mar 2010 accepted: 15 Mar 2010 first online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Nicolas Espurt, Jocelyn Barbarand, Martin Roddaz, Stéphane Brusset, Patrice Baby, Marianne Saillard, Wilber Hermoza; A scenario for late Neogene Andean shortening transfer in the Camisea Subandean zone (Peru, 12°S): Implications for growth of the northern Andean Plateau. GSA Bulletin 2011;; 123 (9-10): 2050–2068. doi: https://doi.org/10.1130/B30165.1 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 SocietyGSA Bulletin Search Advanced Search Abstract Precise knowledge of the timing of deformation in the Subandean zone of the Andean Plateau is a prerequisite for deciphering the late Neogene growth of the Andean Plateau. In this paper, we report new apatite fission-track (AFT) and vitrinite reflectance (Ro) data for a regional balanced cross section of the Camisea Basin in the central Peruvian Subandean zone, adjacent to the northern Andean Plateau. The balanced cross section shows that the structure of this basin is characterized by a broad internal passive roof duplex and external thrust- related anticlines. The balanced cross-section restoration shows 53 km (39%) of total horizontal shortening. We sampled Paleozoic to Cenozoic sedimentary strata for AFT and Ro analyses along the ∼4-km-thick vertical profile of the Mainique back thrust (passive roof thrust), the innermost preserved Subandean structure. Young components of AFT ages are spread between ca. 6 Ma and ca. 24 Ma. A break in the slope in the AFT ages determines the geometry of the Miocene partial annealing zone and the exhumation of the Mainique back thrust at ca. 6 Ma. Sequential restoration calibrated by AFT and Ro data indicates that the last ∼23 km horizontal shortening were accommodated by the Camisea thrust system over the past ∼6 m.y., giving a mean shortening rate of 3.8 mm/yr. Using this shortening rate for the first ∼30 km horizontal shortening, we calculate that the Andean shortening transfer into the Peruvian Subandean zone initially started at ca. 14 Ma. This result suggests that the transfer of shortening from the northern Andean Plateau to the Subandean zone occurred prior to the removal of dense lithosphere previously reported to have occurred between ca. 10 Ma and ca. 7 Ma. We rather propose that the late Neogene growth of the northern Andean Plateau mostly resulted from a continuous crustal shortening combined with lower-crustal flow. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.