Neoproterozoic collisional S-type granitoids of the Yenisei Ridge: petrogeochemical composition and U-Pb,Ar-Ar,and Sm-Nd isotope data |
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| Affiliation: | 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. A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;3. Krasnoyarskgeols''emka Enterprise, ul. Berezina 3a, Krasnoyarsk, 660022, Russia;4. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;1. A.A. Trofimuk Institute of Petroleum Geology and Geophysics, 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. Department of Earth Sciences, Carleton University, Ottawa, ON, K1S 5B6, Canada;2. Faculty of Geology and Geography, Tomsk State University, pr. Lenina 36, Tomsk, 634050, Russia;3. Diamond & Precious Metal Geology Institute, Russian Academy of Sciences, pr. Lenina 39, Yakutsk, 677000, Russia;4. Institute of Physics of the Earth, Russian Academy of Sciences, ul. Bol’shaya Gruzinskaya 10, build. 1, 123995, Moscow, Russia;5. Geological Department, Lomonosov Moscow State University, ul. Leninskie Gory 1, 119991, Moscow, Russia;6. Jack Satterly Geochronology Laboratory, University of Toronto, Toronto, ON, M5S 3B1, Canada;7. Kazan Federal University, ul. Kremlevskaya 18, Kazan, 420000, Russia;8. Department of Geology, Lund University, Lund, 223 62, Sweden;9. Department of Geology and Geophysics, University of Wyoming, Laramie, WY, 82071, USA;1. Applied Research in Ichnology and Sedimentology (ARISE) Group, Department of Earth Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada;2. Ichnology Research Group, Department of Earth and Atmospheric Sciences, 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB T6G 2E3, Canada;3. Alberta Geological Survey, 402 Twin Atria Building, 4999 98 Avenue, Edmonton, AB T6B 2X3, Canada |
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| Abstract: | Collisional granitoid magmatism caused by the Early Neoproterozoic orogeny in the west of the Siberian craton is considered. New data on the petrogeochemical composition, U-Pb (SHRIMP II), Ar-Ar, and Sm-Nd isotopic ages of the Middle Tyrada granitoid massif in the northwestern Yenisei Ridge are presented. Plagiogranites, granodiorites, and quartz diorites of the massif are of calcareous and calc-alkalic composition. The elevated alumina contents and presence of accessory garnet permit them to be assigned to S-type granitoids. Their spidergrams show Rb, Ba, and Th enrichment, minimum Nb, P, and Ti contents, and no Sr depletion. The granitoids formed through the melting of plagioclase-enriched graywacke source, obviously Paleoproterozoic metaterrigenous rocks of the Garevka Formation and Teya Group (TNd(DM) = 2.0-2.5 Ga), judging from the isotope composition of the granitoids (TNd(DM-2st) = 2200 Ma and 8Nd(T) = − 6.0) and the presence of ancient zircon cores (1.80-1.85 Ga). Formation of granitoids took place in the final epoch of the Grenville collision events in the late Early Neoproterozoic (U-Pb zircon age is 857.0 ± 9.5 Ma). In the Late Neoproterozoic, the granitoids underwent tectonothermal reworking caused by Vendian accretion and collision events on the southwestern margin of the Siberian craton, which explain the younger K-Ar biotite age, 615.5 ± 6.3 Ma. |
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