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- W2103789938 abstract "Research Article| July 01, 2008 Cenozoic tectonic evolution of the Qaidam basin and its surrounding regions (Part 3): Structural geology, sedimentation, and regional tectonic reconstruction An Yin; An Yin * 1Structural Geology Group, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China, Permanent Address: Department of Earth and Space Sciences and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90095-1567, USA *Email: yin@ess.ucla.edu Search for other works by this author on: GSW Google Scholar Yu-Qi Dang; Yu-Qi Dang 2Qinghai Oilfield Company, Dunhuang, Gansu Province, People's Republic of China Search for other works by this author on: GSW Google Scholar Min Zhang; Min Zhang 2Qinghai Oilfield Company, Dunhuang, Gansu Province, People's Republic of China Search for other works by this author on: GSW Google Scholar Xuan-Hua Chen; Xuan-Hua Chen 3Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, People's Republic of China Search for other works by this author on: GSW Google Scholar Michael W. McRivette Michael W. McRivette 4Department of Earth and Space Sciences and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90095-1567, USA Search for other works by this author on: GSW Google Scholar Author and Article Information An Yin * 1Structural Geology Group, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China, Permanent Address: Department of Earth and Space Sciences and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90095-1567, USA Yu-Qi Dang 2Qinghai Oilfield Company, Dunhuang, Gansu Province, People's Republic of China Min Zhang 2Qinghai Oilfield Company, Dunhuang, Gansu Province, People's Republic of China Xuan-Hua Chen 3Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, People's Republic of China Michael W. McRivette 4Department of Earth and Space Sciences and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90095-1567, USA *Email: yin@ess.ucla.edu Publisher: Geological Society of America Received: 24 Mar 2007 Revision Received: 11 Aug 2007 Accepted: 14 Aug 2007 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2008 Geological Society of America GSA Bulletin (2008) 120 (7-8): 847–876. https://doi.org/10.1130/B26232.1 Article history Received: 24 Mar 2007 Revision Received: 11 Aug 2007 Accepted: 14 Aug 2007 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation An Yin, Yu-Qi Dang, Min Zhang, Xuan-Hua Chen, Michael W. McRivette; Cenozoic tectonic evolution of the Qaidam basin and its surrounding regions (Part 3): Structural geology, sedimentation, and regional tectonic reconstruction. GSA Bulletin 2008;; 120 (7-8): 847–876. doi: https://doi.org/10.1130/B26232.1 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 The Qaidam basin is the largest topographic depression inside the Tibetan plateau. Because of its central position, understanding the tectonic origin of the Qaidam basin has important implications for unraveling the formation mechanism and growth history of the Tibetan plateau. In order to achieve this goal, we analyzed regional seismic-reflection profiles across the basin and a series of thickness-distribution patterns of Cenozoic strata at different time slices. The first-order structure of the basin is a broad Cenozoic synclinorium, which has an amplitude ranging from >16 km in the west to <4 km in the east. The synclinorium has expanded progressively eastward across the Qaidam region: from the western basin against the Altyn Tagh fault at 65–50 Ma to the eastern basin at 24 Ma. The half-wavelength of the regional fold complex changes from ~170 km in the west to ~50 km in the east. The formation of the synclinorium was induced by an older thrust system initiated ca. 65–50 Ma in the northern margin and a younger thrust system initiated ca. 29–24 Ma in the southern basin margin. Cenozoic upper-crustal shortening decreases eastward across basin from >48% in the west to <1% in the east; the associated strain rates vary from 3.2 × 10−15 s−1 to 1.3 × 10−17 s−1. The eastward decrease in upper-crustal shortening requires a progressive shift in crustal-thickening mechanisms across Qaidam basin, from dominantly upper-crustal shortening in the west to dominantly lower-crustal shortening in the east. Although sedimentation began synchronously at 65–50 Ma across the entire basin, the initiation ages of the southern and northern basin-bounding structures are significantly different; deformation started at 65–50 Ma in the north and at 29–24 Ma in the south. This information and the existing inference that the uplift of the Eastern Kunlun Range south of Qaidam basin began after 30–20 Ma imply that the Paleogene (65–24 Ma) Qaidam and Hoh Xil basins on both sides of the Eastern Kunlun Range may have been parts of a single topographic depression, >500 km wide in the north-south direction between the Qilian Shan and Fenghuo Shan thrust belts in the north and south. The development of this large Paleogene basin in central Tibet and its subsequent destruction and partitioning by the Neogene uplift of the Eastern Kunlun Range requires a highly irregular sequence of deformation, possibly controlled by preexist-ing weakness in the Tibetan lithosphere. 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- W2103789938 title "Cenozoic tectonic evolution of the Qaidam basin and its surrounding regions (Part 3): Structural geology, sedimentation, and regional tectonic reconstruction" @default.
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