U-Pb detrital zircon geochronology and provenance of Neoproterozoic sedimentary rocks in southern Siberia: New insights into breakup of Rodinia and opening of Paleo-Asian Ocean |
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| Affiliation: | 1. Institute of the Earth''s Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk 664033, Russia;2. Earth Dynamics Research Group, ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS), Curtin University, GPO Box U1987, WA 6845, Australia;3. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China;4. Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China;5. The Institute for Geoscience Research (TIGeR), Department of Applied Geology, Curtin University, GPO Box U1987, WA 6845, Australia;1. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 3 Prosp, Akad. Koptyuga, Novosibirsk, 630090, Russia;2. Department of Geological Engineering, Faculty of Engineering, Muğla University, TR-48000, Muğla, Turkey;3. Centre for Tectonics, Exploration and Resources, Department of Earth Sciences, University of Adelaide, SA 5005, Australia;4. School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, China;5. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi''an 710069, China;1. Czech Geological Survey, Klárov 3, 11821 Praha 1, Czech Republic;2. Ecole et Observatoire des Sciences de la Terre, Institut de Physique du Globe de Strasbourg — CNRS UMR7516, Université de Strasbourg, 1 rue Blessig, F-67084 Strasbourg Cedex, France;3. Institut für Geowissenschaften, J. W. Goethe Universität, Altenhöferallee 1, 60438 Frankfurt am Main, Germany;4. Institute of Petrology and Structural Geology, Charles University, 12843 Praha 2, Czech Republic;1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Xinjiang Research Center for Mineral Resources, Chinese Academy of Sciences, Urumqi 830011, China;3. Xinjiang Bureau of Geology and Mineral Resources, Urumqi, Xinjiang 830000, China;1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi''an 710069, China;2. Xi''an Center of Geological Survey, CGS, Xi''an 710054, Shaanxi, China |
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| Abstract: | We present the synthesis of new data on detrital zircon geochronology of the Neoproterozoic strata of the southern part of the Siberian craton as well as a comprehensive analysis of previously published stratigraphic, sedimentological and geochronological (LA-ICP-MS) data obtained for key sections in this area that allows us to trace the process of birth and early stages of development of the Paleo-Asian Ocean (PAO). Before the break-up of Rodinia and opening of PAO, Tonian – Cryogenian intracontinental sedimentary basin existed between southern Siberia and northern Laurentia. The detachment of the southern flank of the Siberian craton from northern Laurentia and opening of the PAO between these cratons took place in Cryogenian. The detrital zircon ages from lower parts of Neoproterozoic successions suggest the Siberian craton as the sole provenance area right after the opening of the PAO. The age constraints on the lower parts of the studied Neoproterozoic successions, which are based on correlation of their tillite horizons with the Marinoan glaciation, suggest the late Cryogenian age for these sedimentary rocks. A clear change in the age spectra of detrital zircons from “unimodal” (Early Precambrian only) in older sedimentary rocks to “bimodal” (Early Precambrian as well as Neoproterozoic) in younger sequences of the studied successions marks the next stage of the PAO evolution. The abundance of youngest (630–610 Ma) detrital zircons in the upper parts of the studied sequences reflects a shrinkage of the oceanic basin as a result of the convergence of the craton with the microcontinents and island arcs within the Paleo-Asian Ocean. We suggest that a passive oceanic margin along the southern margin of the Siberian craton has been transformed into a series of foreland basins at ~610 Ma. |
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