Cenozoic and Mesozoic metamorphism in the Longmenshan orogen: Implications for geodynamic models of eastern Tibet

Abstract

Research Article| September 01, 2003 Cenozoic and Mesozoic metamorphism in the Longmenshan orogen: Implications for geodynamic models of eastern Tibet Simon Wallis; Simon Wallis 1Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8602, Japan Search for other works by this author on: GSW Google Scholar Tatsuki Tsujimori; Tatsuki Tsujimori 2Research Institute of Natural Sciences, Okayama University of Science, Okayama 700-0005, Japan Search for other works by this author on: GSW Google Scholar Mutsuki Aoya; Mutsuki Aoya 3Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8602, Japan Search for other works by this author on: GSW Google Scholar Tetsuo Kawakami; Tetsuo Kawakami 4Department of Earth Sciences, Faculty of Education, Okayama University, Okayama 700-8530, Japan Search for other works by this author on: GSW Google Scholar Kentaro Terada; Kentaro Terada 5Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, Hiroshima 739-8526, Japan Search for other works by this author on: GSW Google Scholar Kazuhiro Suzuki; Kazuhiro Suzuki 6Nagoya University Center for Chronological Research, Nagoya University, Nagoya 464-8602, Japan Search for other works by this author on: GSW Google Scholar Hironobu Hyodo Hironobu Hyodo 7Research Institute of Natural Sciences, Okayama University of Science, Okayama 700-0005, Japan Search for other works by this author on: GSW Google Scholar Author and Article Information Simon Wallis 1Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8602, Japan Tatsuki Tsujimori 2Research Institute of Natural Sciences, Okayama University of Science, Okayama 700-0005, Japan Mutsuki Aoya 3Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8602, Japan Tetsuo Kawakami 4Department of Earth Sciences, Faculty of Education, Okayama University, Okayama 700-8530, Japan Kentaro Terada 5Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, Hiroshima 739-8526, Japan Kazuhiro Suzuki 6Nagoya University Center for Chronological Research, Nagoya University, Nagoya 464-8602, Japan Hironobu Hyodo 7Research Institute of Natural Sciences, Okayama University of Science, Okayama 700-0005, Japan Publisher: Geological Society of America Received: 01 Feb 2003 Revision Received: 27 May 2003 Accepted: 29 May 2003 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2003) 31 (9): 745–748. https://doi.org/10.1130/G19562.1 Article history Received: 01 Feb 2003 Revision Received: 27 May 2003 Accepted: 29 May 2003 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 Simon Wallis, Tatsuki Tsujimori, Mutsuki Aoya, Tetsuo Kawakami, Kentaro Terada, Kazuhiro Suzuki, Hironobu Hyodo; Cenozoic and Mesozoic metamorphism in the Longmenshan orogen: Implications for geodynamic models of eastern Tibet. Geology 2003;; 31 (9): 745–748. doi: https://doi.org/10.1130/G19562.1 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 New zircon U-Pb and mica 40Ar/39Ar dating combined with structural studies in the Longmenshan orogen confirm that most of the upper crustal deformation in the eastern margin of Tibet is Mesozoic. However, at lower structural levels, apatite U-Pb and monazite electron microprobe dating reveals a previously unknown domain of Cenozoic (ca. 65 Ma) Barrovian-type metamorphism and deformation. This discovery shows that the crust in the eastern margin of Tibet was already a substantial thickness around the time of the India-Asia collision. Associated deformation has a N-S-oriented stretching lineation, implying that deformation was not driven by topographic gradients in the Tibetan Plateau. The observed moderate amounts of distributed postmetamorphic E-W shortening can probably explain the present thickness of the continental crust in the area. These results do not support models of crustal thickening caused by solid-state lateral flow of midcrustal metamorphic rocks. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.