Precambrian basement,provenance implication,and tectonic evolution of the Gargan block of the Tuva-Mongolia terranes,Central Asian Orogenic Belt |
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| Institution: | 1. Department of Research and Cooperation, Mongolian University of Science and Technology, 8th khoroo, Baga toiruu 34, Sukhbaatar district, Ulaanbaatar 14191, Mongolia;2. Department of Earth Sciences and Astronomy, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan;3. Department of Biosphere-Geosphere Science, Faculty of Biosphere-Geosphere Science, Okayama University of Science, 1-1 Ridaicho, Kita-ku, Okayama-shi 700-0005, Japan;4. Department of Chemistry, Gakushuin University, 1-5-1, Mejiro, Toshima-ku, Tokyo 171-8588, Japan;5. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8550, Japan;1. Earth Dynamics Research Group, The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia;2. Department of Geosciences, Eberhard Karls University Tübingen, Sigwartstr. 10, 72076 Tübingen, Germany;3. School of Earth Sciences and Resources, China University of Geosciences, 29 Xueyuan Road, Beijing 100083, China;4. St. Francis Xavier University, Antigonish, Nova Scotia, B2G 2W, Canada;1. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, 210023 Nanjing, China;2. Univ. Orléans, CNRS, BRGM, ISTO, UMR 7327, F-45071 Orléans, France;1. Czech Geological Survey, Klárov 3, 118 21 Prague 1, Czech Republic;2. Institute of Petrology and Structural Geology, Faculty of Science, Charles University, Albertov 6, 128 43 Prague 2, Czech Republic;3. Institute of Geology of the CAS, v. v. i., Rozvojová 269, 165 00 Prague 6, Czech Republic;4. Plagioclase LLC, 16th khoroo-19, Bayanzurkh district, Ulaanbaatar, Mongolia |
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| Abstract: | Although the Phanerozoic geology of the Central Asian Orogenic Belt is extensively studied, there is still much to reveal about the initiation and early stages of tectonism. The Gargan block of the Tuva-Mongolia terranes at the Mongolian-Russian border is one of the Archean-Proterozoic continental crustal fragments that record the earliest evolutionary history of the belt. To better constrain the age of its basement, extent, and provenance in regional tectonic framework, we present new zircon U Pb geochronologic data from previously undated basement gneisses and the overlying Neoproterozoic meta-sedimentary rocks of southern part of the Gargan block. Comparison of available basement ages and Precambrian detrital zircon spectra from nearby Archean-Proterozoic continental crustal fragments show complex relationship amongst them. We propose that the Gargan block travelled by itself in most of the Proterozoic or was derived from an unknown continental block. Obtained age confirms the existence of Neoarchean-Neoproterozoic basement in the region; however, for the first time, the 2749–814 Ma Salig Complex reveals multiple stages of Neoproterozoic metamorphic events within the Central Asian Orogenic Belt. Older of which, at ～1 Ga, may relate to an assembly of several of the pre-existing continental crustal fragments in Mongolia. |
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