THE AGE AND GEODYNAMIC INTERPRETATION OF THE KITOI GRANITOID COMPLEX (southern Siberian craton)
D.P. Gladkochub, T.V. Donskaya, A.M. Mazukabzov, E.B. Sal'nikova*, E.V. Sklyarov, and S.Z. Yakovleva*
Institute of the Earth's Crust, Siberian Branch of the RAS, 128 ul. Lermontova, Irkutsk, 664033, Russia
* Institute of the Precambrian Geology and Geochronology, Russian Academy of Sciences,
2 nab. Makarova, St. Petersburg, 199034, Russia
Keywords: Granitoids, terrane, supercontinent, Late Archean, Siberian craton
Pages: 1121-1133
Abstract
Study was given to granitoids of the Kitoi complex on the southern flank of the Siberian craton (Sharyzhalgai uplift). The granitoids are regarded as syntectonic in accordance with their regional occurrence, geology, and structure. Their U-Pb zircon age is 2532 ± 12 Ma. Petrological, geochemical, and isotopic data obtained suggest that the Kitoi granitoids might have been produced from the enclosing metamorphosed sedimentary rocks. The intrusion of these granitoids proceeded synchronously with the formation of the Late Archean Urik-Kitoi collision zone, which originated during the accretion of the Irkut and Oka superterranes of the Sharyzhalgai uplift. Granitoids of the Kitoi complex and coeval granulites of the Urik-Kitoi collision zone are indicators of Late Archean collision processes running within the Sharyzhalgai uplift. These collision and accretion processes correlate well with similar events that took place in the Aldan Shield and in some ancient cratons. On a global scale, these events proceeded during the formation of the Late Archean Pangea 0 supercontinent (Arctic).
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