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Early Neogene unroofing of the Sierra Nevada de Santa Marta, as determined from detrital geothermochronology and the petrology of clastic basin sediments

2017; Geological Society of America; Volume: 130; Issue: 3-4 Linguagem: Inglês

10.1130/b31676.1

1943-2674

Alejandro Piraquive, Edna Pinzón, Andreas Kammer, Matthias Bernet, Albrecht von Quadt,

earthquake and tectonic studies

Research Article| September 06, 2017 Early Neogene unroofing of the Sierra Nevada de Santa Marta, as determined from detrital geothermochronology and the petrology of clastic basin sediments Alejandro Piraquive; Alejandro Piraquive † 1Institut des Sciences de la Terre, Université Grenoble Alpes, 1381, rue de la Piscine, 38400 Saint-Martin d'Hères, France2Grupo de Investigación en Geologia Estructural y Fracturas, Universidad Nacional de Colombia, Apartado Aéreo, 14490 Bogotá, Colombia †Piraquive—alejandro.piraquive-bermudez@univ-grenoble-alpes.fr, apiraquiveb@unal.edu.co; Pinzón—edmpinzonro@unal.edu.co; Kammer—akammer@unal.edu.co; Bernet—matthias.bernet@univ-grenoble-alpes.fr; von Quadt—albrecht.vonquadt@erdw.ethz.ch. Search for other works by this author on: GSW Google Scholar Edna Pinzón; Edna Pinzón † 2Grupo de Investigación en Geologia Estructural y Fracturas, Universidad Nacional de Colombia, Apartado Aéreo, 14490 Bogotá, Colombia †Piraquive—alejandro.piraquive-bermudez@univ-grenoble-alpes.fr, apiraquiveb@unal.edu.co; Pinzón—edmpinzonro@unal.edu.co; Kammer—akammer@unal.edu.co; Bernet—matthias.bernet@univ-grenoble-alpes.fr; von Quadt—albrecht.vonquadt@erdw.ethz.ch. Search for other works by this author on: GSW Google Scholar Andreas Kammer; Andreas Kammer † 2Grupo de Investigación en Geologia Estructural y Fracturas, Universidad Nacional de Colombia, Apartado Aéreo, 14490 Bogotá, Colombia †Piraquive—alejandro.piraquive-bermudez@univ-grenoble-alpes.fr, apiraquiveb@unal.edu.co; Pinzón—edmpinzonro@unal.edu.co; Kammer—akammer@unal.edu.co; Bernet—matthias.bernet@univ-grenoble-alpes.fr; von Quadt—albrecht.vonquadt@erdw.ethz.ch. Search for other works by this author on: GSW Google Scholar Matthias Bernet; Matthias Bernet † 1Institut des Sciences de la Terre, Université Grenoble Alpes, 1381, rue de la Piscine, 38400 Saint-Martin d'Hères, France †Piraquive—alejandro.piraquive-bermudez@univ-grenoble-alpes.fr, apiraquiveb@unal.edu.co; Pinzón—edmpinzonro@unal.edu.co; Kammer—akammer@unal.edu.co; Bernet—matthias.bernet@univ-grenoble-alpes.fr; von Quadt—albrecht.vonquadt@erdw.ethz.ch. Search for other works by this author on: GSW Google Scholar Albrecht von Quadt Albrecht von Quadt † 3Department of Earth Sciences, Institute of Geochemistry and Petrology, ETH Zentrum, Clausiusstrasse 25, 8092 Zurich, Switzerland †Piraquive—alejandro.piraquive-bermudez@univ-grenoble-alpes.fr, apiraquiveb@unal.edu.co; Pinzón—edmpinzonro@unal.edu.co; Kammer—akammer@unal.edu.co; Bernet—matthias.bernet@univ-grenoble-alpes.fr; von Quadt—albrecht.vonquadt@erdw.ethz.ch. Search for other works by this author on: GSW Google Scholar GSA Bulletin (2018) 130 (3-4): 355–380. https://doi.org/10.1130/B31676.1 Article history received: 09 Oct 2016 rev-recd: 16 Jun 2017 accepted: 29 Jul 2017 first online: 06 Sep 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Alejandro Piraquive, Edna Pinzón, Andreas Kammer, Matthias Bernet, Albrecht von Quadt; Early Neogene unroofing of the Sierra Nevada de Santa Marta, as determined from detrital geothermochronology and the petrology of clastic basin sediments. GSA Bulletin 2017;; 130 (3-4): 355–380. doi: https://doi.org/10.1130/B31676.1 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 We used geothermochronologic data from sedimentary rocks, coupled with stratigraphic analyses, to unravel the late Paleogene to early Neogene exhumation of the Sierra Nevada de Santa Marta massif. This fault-bounded triangular northernmost promontory of the Northern Andes exposes Precambrian to Paleozoic metamorphic rocks and a Triassic to Jurassic magmatic arc. We examined the Neogene basin fills of two marginal basins, a western one located along the Santa Marta–Bucaramanga fault, and a northern one occupying the southern hanging-wall block of the Oca fault. The western sequence consists of ∼1200-m-thick conglomeratic gravity deposits that define a progradational Gilbert-type delta emanating from a scarp coinciding with the present Santa Marta–Bucaramanga fault. By its stratigraphic and structural position, this sequence is similar to the northern sequence, which reveals a retrogradational stacking pattern. In order to reconcile these different architectural styles, we propose a regional-scale tilting of the Sierra Nevada de Santa Marta massif toward the NE during the late Paleogene–early Neogene. This model presumes a concomitant evolution of the two sedimentary sequences. Provenance analyses performed on representative units of these sedimentary sections yielded U-Pb age spectra of zircons that correlate with known age data of the underlying basement. Particularly, they lack pre-Grenvillian and Ordovician signals common to Neogene sediments of the wider Miocene Magdalena basin. These marginal basins thus evolved disconnected from the trunk system of the proto–Magdalena River, and they record an initial stage of Oligocene–Miocene segmentation of the South American plate margin. These new findings help to better constrain the paleogeographic setting of the Sierra Nevada de Santa Marta massif and its marginal basins for the late Oligocene–early Neogene during initial breakup of the Caribbean margin. Their sedimentary record depicts an early stage of fault-controlled subsidence of the western margin and a presumably tilt-related transgression of the northern margin that preceded the Miocene expansion of local depocenters and their merging into a wider embayment of the Neogene Lower Magdalena basin. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.