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First field evidence of southward ductile flow of Asian crust beneath southern Tibet

2007; Geological Society of America; Volume: 35; Issue: 8 Linguagem: Inglês

10.1130/g23630a.1

1943-2682

Jess King, Nigel Harris, Tom Argles, R. R. Parrish, B. L. A. Charlier, Sarah C. Sherlock, Hong-Fei Zhang,

High-pressure geophysics and materials

Research Article| August 01, 2007 First field evidence of southward ductile flow of Asian crust beneath southern Tibet Jess King; Jess King 1Department of Earth Sciences, The Open University, Milton Keynes MK7 6AA, UK Search for other works by this author on: GSW Google Scholar Nigel Harris; Nigel Harris 1Department of Earth Sciences, The Open University, Milton Keynes MK7 6AA, UK Search for other works by this author on: GSW Google Scholar Tom Argles; Tom Argles 1Department of Earth Sciences, The Open University, Milton Keynes MK7 6AA, UK Search for other works by this author on: GSW Google Scholar Randy Parrish; Randy Parrish 2Department of Geology, University of Leicester and Natural Environment Research Council Isotope Geosciences Laboratory, British Geological Survey, Keyworth NG12 5GG, UK Search for other works by this author on: GSW Google Scholar Bruce Charlier; Bruce Charlier 3Department of Earth Sciences, The Open University, Milton Keynes MK7 6AA, UK Search for other works by this author on: GSW Google Scholar Sarah Sherlock; Sarah Sherlock 3Department of Earth Sciences, The Open University, Milton Keynes MK7 6AA, UK Search for other works by this author on: GSW Google Scholar Hong Fei Zhang Hong Fei Zhang 4State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China Search for other works by this author on: GSW Google Scholar Author and Article Information Jess King 1Department of Earth Sciences, The Open University, Milton Keynes MK7 6AA, UK Nigel Harris 1Department of Earth Sciences, The Open University, Milton Keynes MK7 6AA, UK Tom Argles 1Department of Earth Sciences, The Open University, Milton Keynes MK7 6AA, UK Randy Parrish 2Department of Geology, University of Leicester and Natural Environment Research Council Isotope Geosciences Laboratory, British Geological Survey, Keyworth NG12 5GG, UK Bruce Charlier 3Department of Earth Sciences, The Open University, Milton Keynes MK7 6AA, UK Sarah Sherlock 3Department of Earth Sciences, The Open University, Milton Keynes MK7 6AA, UK Hong Fei Zhang 4State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China Publisher: Geological Society of America Received: 20 Dec 2006 Revision Received: 08 Mar 2007 Accepted: 23 Mar 2007 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2007) 35 (8): 727–730. https://doi.org/10.1130/G23630A.1 Article history Received: 20 Dec 2006 Revision Received: 08 Mar 2007 Accepted: 23 Mar 2007 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Jess King, Nigel Harris, Tom Argles, Randy Parrish, Bruce Charlier, Sarah Sherlock, Hong Fei Zhang; First field evidence of southward ductile flow of Asian crust beneath southern Tibet. Geology 2007;; 35 (8): 727–730. doi: https://doi.org/10.1130/G23630A.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 There is lively debate on whether Asian plate material was involved in southward flow of mid-lower crust in a ductile channel beneath southern Tibet. One argument against such involvement is the apparent absence of material derived from Asian lithosphere within the High Himalayan Series (Indian plate) that could represent the putative channel. A north-south–trending mid-Miocene dike swarm that intrudes the Tethyan sedimentary cover of the Sakya gneiss dome (Indian plate) yields new Sr-Nd isotopic data (87Sr/86Sr = 0.7071–0.7079; ϵNd −4 to −6) indicating that these melts share the same source as Miocene dacitic dikes from north of the Indus-Tsangpo suture. Moreover, dikes on both sides of this suture represent crustal melts derived largely from mid-lower crust of the Asian plate, exposed today as the Nyainqentanglha gneisses that underlie the Gangdese batholith. We infer that melting of the Asian lithosphere extended south of the surface trace of the suture, requiring southward propagation of anatectic Asian middle crustal material during the Miocene. The emplacement ages of the southern dike swarm (12–9 Ma) thus delimit the timing of active southward ductile flow of Asian material. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.