Tectonic mélange records the Silurian–Devonian subduction-metamorphic process of the southern Dunhuang terrane, southernmost Central Asian Orogenic Belt

Research Article| May 01, 2017 Tectonic mélange records the Silurian–Devonian subduction-metamorphic process of the southern Dunhuang terrane, southernmost Central Asian Orogenic Belt Hao Y.C. Wang; Hao Y.C. Wang 1College of Earth Science, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China2State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China Search for other works by this author on: GSW Google Scholar Hong-Xu Chen; Hong-Xu Chen 1College of Earth Science, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China Search for other works by this author on: GSW Google Scholar Qian W.L. Zhang; Qian W.L. Zhang 1College of Earth Science, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China Search for other works by this author on: GSW Google Scholar Meng-Yan Shi; Meng-Yan Shi 1College of Earth Science, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China Search for other works by this author on: GSW Google Scholar Quan-Ren Yan; Quan-Ren Yan 1College of Earth Science, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China2State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China Search for other works by this author on: GSW Google Scholar Quan-Lin Hou; Quan-Lin Hou 1College of Earth Science, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China2State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China Search for other works by this author on: GSW Google Scholar Qing Zhang; Qing Zhang 3Institute of Geomechanics, Chinese Academy of Geological Sciences, 11 South Minzudaxue Road, Beijing 100081, China Search for other works by this author on: GSW Google Scholar Timothy Kusky; Timothy Kusky 4State Key Laboratory of Geological Processes and Mineral Resources, Center for Global Tectonics and School of Earth Sciences, China University of Geosciences, Wuhan 430074, China Search for other works by this author on: GSW Google Scholar Chun-Ming Wu Chun-Ming Wu * 1College of Earth Science, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China2State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China *E-mail: wucm@ucas.ac.cn Search for other works by this author on: GSW Google Scholar Author and Article Information Hao Y.C. Wang 1College of Earth Science, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China2State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China Hong-Xu Chen 1College of Earth Science, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China Qian W.L. Zhang 1College of Earth Science, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China Meng-Yan Shi 1College of Earth Science, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China Quan-Ren Yan 1College of Earth Science, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China2State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China Quan-Lin Hou 1College of Earth Science, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China2State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China Qing Zhang 3Institute of Geomechanics, Chinese Academy of Geological Sciences, 11 South Minzudaxue Road, Beijing 100081, China Timothy Kusky 4State Key Laboratory of Geological Processes and Mineral Resources, Center for Global Tectonics and School of Earth Sciences, China University of Geosciences, Wuhan 430074, China Chun-Ming Wu * 1College of Earth Science, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China2State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China *E-mail: wucm@ucas.ac.cn Publisher: Geological Society of America Received: 24 Nov 2016 Revision Received: 16 Jan 2017 Accepted: 19 Jan 2017 First Online: 28 Jun 2017 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2017 Geological Society of America Geology (2017) 45 (5): 427–430. https://doi.org/10.1130/G38834.1 Article history Received: 24 Nov 2016 Revision Received: 16 Jan 2017 Accepted: 19 Jan 2017 First Online: 28 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Hao Y.C. Wang, Hong-Xu Chen, Qian W.L. Zhang, Meng-Yan Shi, Quan-Ren Yan, Quan-Lin Hou, Qing Zhang, Timothy Kusky, Chun-Ming Wu; Tectonic mélange records the Silurian–Devonian subduction-metamorphic process of the southern Dunhuang terrane, southernmost Central Asian Orogenic Belt. Geology 2017;; 45 (5): 427–430. doi: https://doi.org/10.1130/G38834.1 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 Hongliuxia tectonic mélange of the southern Dunhuang terrane, northwestern China, southernmost Central Asian Orogenic Belt (CAOB), consists of eclogite, mafic granulite, and amphibolite as puddingstones within a matrix of metapelitic gneiss and marble; these rocks are interpreted to be part of an ancient subduction zone setting. Secondary ion mass spectrometry U-Pb dating of metamorphic zircons obtained from the puddingstones and matrix metapelite suggests that the metamorphism occurred at ca. 428–391 Ma. The metamorphic rocks all record similar clockwise metamorphic pressure-temperature-time (P-T-t) paths of the western Alpine type. However, remarkable differences between metamorphic peak P-T conditions ranging from 830 °C and 24.2 kbar for the eclogite puddingstone to 700 °C and 10.2 kbar for the metapelite matrix were found in the mélange rocks. This indicates the mixing of rocks from significantly different depths to create a tectonic mélange in a subduction channel, possibly juxtaposed during the uplift stage. These data suggest that the southernmost CAOB underwent subduction and subsequent exhumation caused by subduction of the Paleozoic Hongliuxia ocean during the middle Silurian to middle Devonian. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.