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Pliocene–Pleistocene orographic control on denudation in northwest Argentina

2019; Geological Society of America; Volume: 47; Issue: 4 Linguagem: Inglês

10.1130/g45800.1

1943-2682

Heiko Pingel, Taylor Schildgen, Manfred R. Strecker, Hella Wittmann,

Landslides and related hazards

Research Article| February 26, 2019 Pliocene–Pleistocene orographic control on denudation in northwest Argentina Heiko Pingel; Heiko Pingel 1Institut für Geowissenschaften, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany Search for other works by this author on: GSW Google Scholar Taylor Schildgen; Taylor Schildgen 1Institut für Geowissenschaften, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany2Helmholtz Centre Potsdam–GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany Search for other works by this author on: GSW Google Scholar Manfred R. Strecker; Manfred R. Strecker 1Institut für Geowissenschaften, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany Search for other works by this author on: GSW Google Scholar Hella Wittmann Hella Wittmann 2Helmholtz Centre Potsdam–GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information Heiko Pingel 1Institut für Geowissenschaften, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany Taylor Schildgen 1Institut für Geowissenschaften, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany2Helmholtz Centre Potsdam–GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany Manfred R. Strecker 1Institut für Geowissenschaften, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany Hella Wittmann 2Helmholtz Centre Potsdam–GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany Publisher: Geological Society of America Received: 07 Nov 2018 Revision Received: 01 Feb 2019 Accepted: 04 Feb 2019 First Online: 27 Feb 2019 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2019 Geological Society of America Geology (2019) 47 (4): 359–362. https://doi.org/10.1130/G45800.1 Article history Received: 07 Nov 2018 Revision Received: 01 Feb 2019 Accepted: 04 Feb 2019 First Online: 27 Feb 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Heiko Pingel, Taylor Schildgen, Manfred R. Strecker, Hella Wittmann; Pliocene–Pleistocene orographic control on denudation in northwest Argentina. Geology 2019;; 47 (4): 359–362. doi: https://doi.org/10.1130/G45800.1 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 The intermontane Humahuaca Basin in the Eastern Cordillera of the northwest Argentine Andes lies leeward of an orographic barrier to easterly derived moisture. An average of >2000 mm/yr of rainfall along the eastern flanks of the barrier contrasts with <200 mm/yr in the orogen interior. Paleoenvironmental reconstructions suggest that the basin became disconnected from the foreland during the Miocene–Pliocene by the growth of fault-bounded mountain ranges. Fossil records, sedimentology, and stable isotope data imply that rerouting of the fluvial network by 4.2 Ma and reduced rainfall by ca. 3 Ma were consequences of that range uplift. Here, we present cosmogenic nuclide–derived (10Be) paleodenudation rates from 6 to 2 Ma fluvial deposits collected from the Humahuaca Basin. Despite increased tectonic activity, our 10Be data show a tenfold decrease in denudation rates at ca. 3 Ma, documenting a link between uplift-induced semiarid conditions and decreasing hillslope denudation rates. This new data set thus demonstrates the influence of hydrological change on spatiotemporal denudation patterns in tectonically active mountain areas. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.