Precambrian geology of the Kazakh Uplands and Tien Shan: An overview |
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| Institution: | 1. Geological Institute, Russian Academy of Sciences, 7 Pyzhevsky Pereulok, Moscow 119017, Russian Federation;2. Institute for Geology and Geochronology of the Precambrian, Russian Academy of Sciences, 2 Makarova Embankment, St.-Petersburg 199034, Russian Federation;1. Laboratory of Isotope Thermochronology, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;3. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;4. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;5. Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;6. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;7. Department of Geology, Northwest University, Xi''an 710069, China;1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, PR China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, PR China;3. Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;4. Department of Earth and Environmental Sciences, California State University, Fresno, CA 93740, USA;1. Geological Faculty, St. Petersburg State University, 7/9 University Embankment, St. Petersburg 199034, Russia;2. Natural History Museum, Centre for Russian and Central EurAsian Mineral Studies (CERCAMS), London SW7 5BD, UK;3. Institute of Geology, Earthquake Engineering and Seismology of the Academy Science of the Republic of Tajikistan, 267 Ainy St., Dushanbe 734063, Tajikistan;4. Deutsches GeoForschungsZentrum (GFZ), Telegrafenberg, D-14473, Potsdam, Germany;5. Institut für Geowissenschaften, Universität Mainz, D-55099 Mainz, Germany;6. Departamento de Ciencias de la Tierra y de la Construcción, Universidad de las Fuerzas Armadas ESPE, Sangolquì, Ecuador;7. Atlantic Branch of the P.P. Shirshov Institute of Oceanology, 1 Prospect Mira, Kaliningrad 236022, Russia;1. Natural History Museum, Department of Earth Sciences, CERCAMS, London SW7 5BD, UK;2. St. Petersburg State University, Geological Faculty, St. Petersburg 199034, Russia;3. All Russian Geological Research Institute (VSEGEI), St. Petersburg 199106, Russia;4. Macquarie University, CCFS/GEMOC, NSW 2109, Sydney, Australia;5. British Geological Survey, Keyworth, Nottingham NG12 5GG, UK;6. National University of Uzbekistan, Department of Geology, Tashkent, Uzbekistan;7. Institute of Mineral Resources, Gozkomgeologiya, Tashkent, Uzbekistan |
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| Abstract: | A comprehensive review of new data on geology and geochronology of Precambrian terranes in the western Central Asian Orogenic Belt reveals new insights into its evolution. At the present surface, these terranes mostly consist of Meso- to Neoproterozoic sedimentary, magmatic and metamorphic assemblages, with insignificant Paleoproterozoic rocks. Archean material is represented exclusively by detrital and xenocrystic zircons in younger strata. Meso- to Neoproterozoic felsic magmatic rocks were mostly sourced from Neoarchean and Paleoproterozoic continental crust, indicating its reworking and potential wider presence at deeper crustal levels. Most Meso- to Neoproterozoic assemblages are of intraplate origin. The supra-subduction assemblages of Neoproterozoic and Mesoproterozoic ages are of limited extent.We propose to recognize the Issedonian and Ulutau-Moyunkum groups of terranes, separated by early Paleozoic Z-shaped ophiolitic suture, based on their different tectono-magmatic evolution in the Mesoproterozoic and Neoproterozoic. Distinctly different are the Mesoproterozoic and early Neoproterozoic assemblages, with lithological variations at the beginning of the late Neoproterozoic and practically no differences at the end of the Neoproterozoic.The Issedonian group of terranes could be part of a Mesoproterozoic (ca. 1100 Ma) orogen between the Siberian, North China and Laurentian cratons. The pre-Mesoproterozoic crust of these terranes was completely reworked during the younger events. The Ulutau-Moyunkum group of terranes appear to be lithologically and geochronologically similar to the Tarim craton. Both the Issedonian and Ulutau-Moyunkum groups of terranes were metamorphosed during the Ulutau-Moyunkum event at 700 ± 25 Ma.The breakup into currently mappable Precambrian terranes took place during end-Ediacaran to early Paleozoic times after opening of oceanic basins, whose relics are preserved in numerous Paleozoic ophiolitic sutures. |
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