Ordovician metamorphic event in the carbonate platform of the Argentine Precordillera: Implications for the geotectonic evolution of the proto-Andean margin of Gondwana

Abstract

Research Article| April 01, 2009 Ordovician metamorphic event in the carbonate platform of the Argentine Precordillera: Implications for the geotectonic evolution of the proto-Andean margin of Gondwana Gustavo G. Voldman; Gustavo G. Voldman * 1CONICET—Museo de Paleontología, Universidad Nacional de Córdoba, Córdoba X5000FCO, Argentina *E-mail: gvoldman@efn.uncor.edu Search for other works by this author on: GSW Google Scholar Guillermo L. Albanesi; Guillermo L. Albanesi 1CONICET—Museo de Paleontología, Universidad Nacional de Córdoba, Córdoba X5000FCO, Argentina Search for other works by this author on: GSW Google Scholar Víctor A. Ramos Víctor A. Ramos 2CONICET—Laboratorio de Tectónica Andina, Universidad de Buenos Aires, Buenos Aires C1428EHA, Argentina Search for other works by this author on: GSW Google Scholar Author and Article Information Gustavo G. Voldman * 1CONICET—Museo de Paleontología, Universidad Nacional de Córdoba, Córdoba X5000FCO, Argentina Guillermo L. Albanesi 1CONICET—Museo de Paleontología, Universidad Nacional de Córdoba, Córdoba X5000FCO, Argentina Víctor A. Ramos 2CONICET—Laboratorio de Tectónica Andina, Universidad de Buenos Aires, Buenos Aires C1428EHA, Argentina *E-mail: gvoldman@efn.uncor.edu Publisher: Geological Society of America Received: 27 Sep 2008 Revision Received: 10 Nov 2008 Accepted: 14 Nov 2008 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2009 Geological Society of America Geology (2009) 37 (4): 311–314. https://doi.org/10.1130/G25540A.1 Article history Received: 27 Sep 2008 Revision Received: 10 Nov 2008 Accepted: 14 Nov 2008 First Online: 02 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 Gustavo G. Voldman, Guillermo L. Albanesi, Víctor A. Ramos; Ordovician metamorphic event in the carbonate platform of the Argentine Precordillera: Implications for the geotectonic evolution of the proto-Andean margin of Gondwana. Geology 2009;; 37 (4): 311–314. doi: https://doi.org/10.1130/G25540A.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 SocietyGeology Search Advanced Search Abstract An Ordovician metamorphic event is recorded by means of conodont paleothermometry in the slope sedimentary sequences of the Western Precordillera. Allochthonous conodonts from reworked deposits of the eastern carbonate platform with CAI 4.5–5 and autochthonous conodonts from the olistostrome matrix with CAI 3 allow for constraining the metamorphic age within the Paltodus deltifer and Lenodus variabilis zones (i.e., ca. 480–465 Ma). The conodont data support an Ordovician instead of an alternative Devonian collision for the Cuyania terrane with the proto-Andean margin of Gondwana, which is consistent with the earlier proposed, but still contentious, microcontinent model. In the latter scenario, the collision of the Cuyania terrane caused unroofing and cannibalism of the leading edge of the carbonate succession and basement rocks. The erosion of these rocks supplied detritus and metamorphosed conodonts to the deeper basinal settings of the Western Precordillera. As the deformation front migrated into the peripheral foreland of the Eastern and Central Precordillera, nonmetamorphosed conodonts were eventually incorporated into the west-prograding synorogenic clastic wedge. The occurrence of allochthonous and autochthonous conodonts in the slope facies of the Western Precordillera provides a time constraint for the early accretion of the Cuyania terrane and its transition to an evolving foreland mountain system in the Ordovician period. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.