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Russian Geology and Geophysics

2019 year, number 5

EARLY PALEOZOIC GRANITOID MAGMATISM IN THE EAST TANNU-OLA SECTOR OF THE TUVINIAN MAGMATIC BELT: GEODYNAMIC SETTING, AGE, AND METALLOGENY

E.V. Vetrov1,2, A.I. Chernykh3, and G.A. Babin1,4

1 Siberian Research Institute of Geology, Geophysics and Mineral Resources, Krasnyi pr. 67, Novosibirsk, 630091, Russia

2 V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences,
pr. Koptyuga 3, Novosibirsk, 630090, Russia

3 Central Research Institute of Geological Prospecting for Base and Precious Metals, Varshavskoe shosse 129, korp. 1, Moscow, 117545, Russia

4 A.P. Karpinsky Russian Geological Research Institute, Srednii pr. 7, St. Petersburg, 199026, Russia
Keywords: Granitoid magmatism, U/Pb (SHRIMP-II) zircon dating, petrogeochemical and isotope-geochemical (Sm/Nd and Rb/Sr) studies, gold, copper, lead, zinc, metallogeny, Republic of Tyva, East Tannu-Ola sector, Tuvinian magmatic belt

Abstract

The East Tannu-Ola sector of the Tuvinian magmatic belt is composed of Early Cambrian volcanosedi-mentary rocks of an island-arc association (Kadvoi, Serlig, and Irbitei Formations), which are intruded by granit-oid massifs of different ages (from Cambrian to Devonian) of the Tannu-Ola areal pluton. We analyzed the structural and geologic position, chemical composition, metallogenic signatures, and ge-ochronological (U/Pb) and isotope-geochemical (Sm/Nd and Rb/Sr) characteristics of Early Paleozoic granitoids of the Ungesh pluton (western part of the Tannu-Ola areal pluton). The available and our new data made it possi-ble to establish the specific chemical parameters, age sequence, duration, intensity, and metallogeny of granitoid magmatism in the East Tannu-Ola sector of the Tuvinian magmatic belt. An early Cambrian (534518 Ma) gabbroplagiogranite complex similar to the Maina complex in West Sayan has been recognized in the Ungesh pluton. The age and metallogeny of the middlelate Cambrian (508492 Ma) Tannu-Ola dioritegranodioriteplagiogranite and Late Ordovician (451447 Ma) Argolik graniteleucogranite complexes have been refined. Granitoids of the early Cambrian complex formed probably at the initial stage of formation of an island arc, in association with the KadvoiSerlig basaltandesiterhyolite complex. It is in these granitoids that early low-productivity goldsulfidequartz veins and veinlets originated. Granitoids of the Tannu-Ola complex formed at the initial stage of evolution of the accretioncollision system. Magnetite-containing skarns and numerous veinveinlet zones of late high-productivity gold-sulfide-quartz mineralization evolved in these granitoids. Granitoid massifs of the Argolik complex formed at the final stage of evolution of the accretioncollision system and probably played a crucial role in the regeneration of ore mineralization in some areas.

DOI: 10.15372/RGG2019047