GEOCHEMISTRY AND Rb-Sr AGE OF GRAPHITE-BEARING GRANITOIDS IN THE SOUTHEAST OF THE MAIN SAYAN FAULT
V.B. Savel'eva, Yu.A. Kostitsyn*, A.V. Travin**, V.A. Ponomarchuk**, and A.S. Moshchenko*
Institute of the Earth's Crust, Siberian Branch of the RAS,
128 ul. Lermontova, Irkutsk, 664033, Russia
* Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences,
19 ul. Kosygina, Moscow, 119991, Russia
** United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS,
3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Granites, leucogranites, pegmatites, graphite, carbon, Main Sayan Fault
Pages: 218-236
Abstract
The paper deals with the petrography and geochemistry of graphite-bearing granitoids (garnet-biotite granites, leucogranites, pegmatoid granites, pegmatites, plagioclasites, and syenites) composing up to 2 m thick veins among blastomylonites and blastocataclasites in the southeast of the Main Sayan Fault, at the boundary between the Sharyzhalgai uplift of the basement of the Siberian Platform and the Caledonian Slyudyanka crystalline complex. The granitoids are the products of crystallization of low-temperature (760-710
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