Geochronology and geochemistry of metasedimentary rocks from the Dongnancha Formation in the Huadian area,central Jilin Province,Northeast (NE) China: Implications for the tectonic evolution of the eastern segment of the Paleo-Asian Ocean |
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| Institution: | 1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. University of Chinese Academy of Sciences, Beijing 100039, China;3. Inner Mongolia Nonferrous Geological Mining Limited Liability Company, Hohhot 010010, China;4. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geoscience, Beijing 100083, China;5. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geoscience, Wuhan 430074, China;1. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Radiogenic Isotope Facility, School of Earth and Environment Sciences, University of Queensland, Brisbane, QLD 4072, Australia;3. Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, School of Earth Sciences, Guilin University of Technology, Guilin 541004, China;1. College of Earth Sciences, Jilin University,2199 Jianshe Street, Changchun 130061, PR China;2. Institute of Geologic Survey, Jilin Province, Changchun 130021, PR China;3. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China;4. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, PR China;5. College of Marine Geosciences, Ocean University of China, Qingdao 266100, PR China;1. College of Earth Sciences, Jilin University, Changchun 130061, PR China;2. College of Marine Geosciences, Ocean University of China, Qingdao 266003, PR China;3. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, PR China;4. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, PR China;1. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, Peking University, Beijing 100871, China;2. Université d''Orléans, ISTO, UMR 7327, 45071 Orléans, France;3. National Key Laboratory of Remote Sensing Information and Image Analysis Technology, Beijing Research Institute of Uranium Geology, Beijing 100029, China;4. CNRS/INSU, ISTO, UMR 7327, 45071 Orléans, France;5. BRGM, ISTO, UMR 7327, BP 36009, 45060 Orléans, France |
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| Abstract: | To constrain the tectonic evolution of the eastern segment of the Paleo-Asian Ocean, we conducted zircon U–Pb-Hf dating and whole-rock geochemical analyses for metasedimentary rocks from the Dongnancha Formation in the Huadian area in central Jilin Province, Northeastern (NE) China. Most detrital zircons from the metasedimentary rocks display clear oscillatory zoning and striped absorption in cathodoluminescence (CL) images and have Th/U ratios of 0.1–1.8, thus indicating a magmatic origin. U–Pb isotopic dating using LA-ICP-MS method for zircon samples from the metasedimentary rocks reveals that the depositional age can be constrained to the period between 250 and 222 Ma. Geochemical data reveal low to intermediate degrees of weathering of the source material and compositionally low to intermediate maturity. Detailed analyses of detrital zircon U–Pb-Hf geochronology and geochemistry show that these metasedimentary rocks are derived from a bidirectional provenance. The predominant derivation is from Permian–Early Triassic felsic-intermediate igneous rocks of central Jilin Province and adjacent regions in the northern margin of the North China Craton, although felsic-intermediate igneous rocks and continental material in the eastern segment of the Central Asian Orogenic Belt from the Cambrian–Carboniferous represent additional sources and minor amounts of Paleoproterozoic–Neoproterozoic material have been input from the North China Craton. A number of geochemical indicators and tectonic discrimination diagrams collectively indicate a continental island arc-active continental margin setting for the deposition of the protoliths of the metasedimentary rocks. The results of geochemical and geochronological analyses of the provenance and tectonic setting of the metasedimentary rocks indicate that the Dongnancha Formation was likely deposited in an intermountain basin in a post-orogenic fast uplift setting, suggesting that the final closure of the eastern segment of the Paleo-Asian Ocean in the Huadian area of central Jinlin Province likely occurred between the Early Triassic and Middle Triassic. |
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| Keywords: | Northeastern China Central Asian orogenic belt Detrital zircon U–Pb geochronology Provenance Tectonic evolution |
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