Continental crust of Gorny Altai: stages of formation and evolution; indicative role of granitoids |
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| Institution: | 1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;1. Institut für Geologie und Paläontologie, Westfälische Wilhelms-Universität Münster, Corrensstraße 24, 48149 Münster, Germany;2. Institut für Geowissenschaften, Friedrich Schiller Universität Jena, Wöllnitzer Straße 7, 07749 Jena, Germany;3. Now at: Geowissenschaftliches Zentrum, Georg-August-Universität Göttingen, Goldschmidtstraße 3, 37077 Göttingen, Germany;1. Department of Geology, College of Science, Salahaddin University, Erbil, Iraq;2. Department of Earth Sciences, Dalhousie University, Halifax, NS, B3H 4J1, Canada;3. Department of Geology, St. Mary''s University, Halifax, NS B3H-3C3, Canada;1. A.P. Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, ul. Favorskogo 1a, Irkutsk, 664033, Russia;2. Institute of Earth’s Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia;3. Far Eastern Federal University, ul. Sukhanova 8, Vladivostok, 690950, Russia;4. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;5. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;6. Institute of Earth Sciences, Academia Sinica, 128, Academia Road, Sec. 2, Nangang, Taipei, 11529, Taiwan;7. Institute of Geology, Komi Science Center, Ural Branch of the Russian Academy of Sciences, ul. Pervomaiskaya 54, Syktyvkar, 167982, Russia;1. Dipartimento di Fisica e Scienze della Terra “Macedonio Melloni”, Università di Parma, Viale Parco Area delle Scienze 157/A, 43124 Parma, Italy;2. Dipartimento di Scienze della Terra, della Vita e dell''Ambiente, Università di Urbino “Carlo Bo”, Campus Scientifico E. Mattei, 61029 Urbino, Italy;1. University of British Columbia, 2020-2207 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada;2. Klondike Gold Corporation, 3123 - 595 Burrard St., Vancouver, British Columbia V7X 1J1, Canada |
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| Abstract: | The composition and mechanisms of formation of continental crust in Gorny Altai and the role of granitoid magmatism in its evolution are considered. Geochemical and isotope data for major types of rocks of primary crust and for Early–Middle Paleozoic granitoids of the region are presented. The role of granitoids as indicators of the different stages of the continental-crust evolution is discussed. A review of the main models of continental crust formation is maid, and their applicability to the Gorny Altai segment of the Central Asian Fold Belt is shown. Based on the complex of geological, geochemical, isotope, and geochronological data, it has been established that the formation of continental crust in the Early and Late Caledonian terranes of Gorny Altai proceeded nearly synchronously (in the Middle–Late Devonian).In the Early Caledonian terranes, this process was the consequence of the multistage fractionation of primary juvenile crust of basic composition, and in the Late Caledonian ones it was the result of one-cycle intracrustal melting of hybrid andesitic crust rich in recycled material. |
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