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Climatic and glacial impact on erosion patterns and sediment provenance in the Himalayan rain shadow, Zanskar River, NW India

2017; Geological Society of America; Volume: 129; Issue: 7-8 Linguagem: Inglês

10.1130/b31573.1

1943-2674

Tara N. Jonell, Andrew Carter, Philipp Böning, Katharina Pahnke, Peter D. Clift,

Geochemistry and Elemental Analysis

Research Article| July 01, 2017 Climatic and glacial impact on erosion patterns and sediment provenance in the Himalayan rain shadow, Zanskar River, NW India Tara N. Jonell; Tara N. Jonell † 1Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803, USA †tjonel1@lsu.edu Search for other works by this author on: GSW Google Scholar Andrew Carter; Andrew Carter 2Department of Earth and Planetary Sciences, Birkbeck College, London, WC1E 7HX, United Kingdom Search for other works by this author on: GSW Google Scholar Philipp Böning; Philipp Böning 3Max Planck Research Group for Marine Isotope Geochemistry, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, 26129 Oldenburg, Germany Search for other works by this author on: GSW Google Scholar Katharina Pahnke; Katharina Pahnke 3Max Planck Research Group for Marine Isotope Geochemistry, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, 26129 Oldenburg, Germany Search for other works by this author on: GSW Google Scholar Peter D. Clift Peter D. Clift 1Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803, USA4School of Geography Science, Nanjing Normal University, Nanjing 210023, China Search for other works by this author on: GSW Google Scholar Author and Article Information Tara N. Jonell † 1Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803, USA Andrew Carter 2Department of Earth and Planetary Sciences, Birkbeck College, London, WC1E 7HX, United Kingdom Philipp Böning 3Max Planck Research Group for Marine Isotope Geochemistry, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, 26129 Oldenburg, Germany Katharina Pahnke 3Max Planck Research Group for Marine Isotope Geochemistry, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, 26129 Oldenburg, Germany Peter D. Clift 1Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803, USA4School of Geography Science, Nanjing Normal University, Nanjing 210023, China †tjonel1@lsu.edu Publisher: Geological Society of America Received: 13 May 2016 Revision Received: 02 Nov 2016 Accepted: 26 Feb 2017 First Online: 06 Jul 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2017 Geological Society of America GSA Bulletin (2017) 129 (7-8): 820–836. https://doi.org/10.1130/B31573.1 Article history Received: 13 May 2016 Revision Received: 02 Nov 2016 Accepted: 26 Feb 2017 First Online: 06 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Tara N. Jonell, Andrew Carter, Philipp Böning, Katharina Pahnke, Peter D. Clift; Climatic and glacial impact on erosion patterns and sediment provenance in the Himalayan rain shadow, Zanskar River, NW India. GSA Bulletin 2017;; 129 (7-8): 820–836. doi: https://doi.org/10.1130/B31573.1 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 Erosion is a key step in the destruction and recycling of the continental crust, yet its primary drivers continue to be debated. The relative balance between climatic and solid Earth forces in determining erosion patterns and rates, and in turn orogenic architecture, is unresolved. The monsoon-dominated frontal Himalaya is a classic example of how surface processes may drive focused denudation and potentially control structural evolution. We investigate whether there is a clear relationship between climate and erosion in the drier Himalayan rain shadow on the periphery of the Tibetan Plateau, where a coupled climate-erosion relationship is less clear. We present a new integrated data set combining bulk petrography, geomorphometric analysis, detrital U-Pb zircon geochronology, and bulk Nd and Sr isotope geochemistry from modern river sediments that provides constraints on spatial patterns of sediment production and transport in the Zanskar River. Zanskar River sands are dominated by Greater Himalayan detritus sourced from the glaciated Stod River catchment, which represents only 13% of the total basin area. Prevalent zircon peaks from Cambrian–Ordovician (440–500 Ma) and Mississippian–Permian (245–380 Ma) units indicate more abundant pre-Himalayan granitoids in the northwest Indian Himalaya than in the central and eastern Himalaya. Erosion from the widely exposed Tethyan Himalaya, however, appears modest. Spatial patterns of erosion do not correlate with highest channel steepness. Our data demonstrate that Zanskar differs from the monsoon-soaked frontal Himalaya and the arid, extremely slow-eroding Tibetan orogenic interior in that focused erosion and sediment production are driven by glaciers. Subsequent remobilization of glacially derived sediments is likely controlled by monsoonal rainfall, and we suggest sediment reworking plays an important role. These data support a strong climatic control on modern orogenic erosion in the Himalayan rain shadow on the periphery of the Tibetan Plateau. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.