Neogene shortening contribution to crustal thickening in the back arc of the Central Andes

Abstract

Research Article| October 01, 1997 Neogene shortening contribution to crustal thickening in the back arc of the Central Andes Patrice Baby; Patrice Baby 1Institut Français de Recherche Scientifique pour le Développement en Coopération, Apartado 17.11.6596, Quito, Ecuador Search for other works by this author on: GSW Google Scholar Philippe Rochat; Philippe Rochat 2Laboratoire de Géodynamique des Chaînes Alpines, 15 rue Maurice Gignoux, 38031 Grenoble, Cedex, France Search for other works by this author on: GSW Google Scholar Georges Mascle; Georges Mascle 2Laboratoire de Géodynamique des Chaînes Alpines, 15 rue Maurice Gignoux, 38031 Grenoble, Cedex, France Search for other works by this author on: GSW Google Scholar Gérard Hérail Gérard Hérail 3Institut Français de Recherche Scientifique pour le Développement en Coopération, Casilla 53390, Correo Central, Santiago 1, Chile Search for other works by this author on: GSW Google Scholar Author and Article Information Patrice Baby 1Institut Français de Recherche Scientifique pour le Développement en Coopération, Apartado 17.11.6596, Quito, Ecuador Philippe Rochat 2Laboratoire de Géodynamique des Chaînes Alpines, 15 rue Maurice Gignoux, 38031 Grenoble, Cedex, France Georges Mascle 2Laboratoire de Géodynamique des Chaînes Alpines, 15 rue Maurice Gignoux, 38031 Grenoble, Cedex, France Gérard Hérail 3Institut Français de Recherche Scientifique pour le Développement en Coopération, Casilla 53390, Correo Central, Santiago 1, Chile Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1997) 25 (10): 883–886. https://doi.org/10.1130/0091-7613(1997)025<0883:NSCTCT>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Patrice Baby, Philippe Rochat, Georges Mascle, Gérard Hérail; Neogene shortening contribution to crustal thickening in the back arc of the Central Andes. Geology 1997;; 25 (10): 883–886. doi: https://doi.org/10.1130/0091-7613(1997)025<0883:NSCTCT>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 To illustrate the Neogene shortening distribution in the back-arc units of the Central Andes and to estimate the contribution of the shortening to crustal thickening, two balanced crustal cross sections have been constructed across the northern and southern branches of the Bolivian orocline. Total Neogene shortening, which varies from 191 to 231 km, is accommodated by a crustal duplex below the Cordillera Oriental, but is insufficient to produce the 70 km of crustal thickness evidenced by geophysical data below the Altiplano. The best explanation for this anomalous thickening seems to be crustal underplating by material tectonically eroded from the continental margin; this process probably caused the Altiplano uplift. The subduction of oceanic lithosphere coupled with this underplating and a brief episode of gravity spreading of the Altiplano constituted the driving forces that produced Neogene shortening and development of the Central Andes. 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.