【摘 要】
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The first data on P-T metamorphic conditions coupled with U-Pb monazite and zircon age obtained for the Neoarchean Kitoy granulite-gneiss terrane (SW Siberian C
【机 构】
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V.S. Sobolev Institute of Geology and Mineralogy SB RAS, 3 Koptyuga Av., Novosibirsk, 630090, Russia
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The first data on P-T metamorphic conditions coupled with U-Pb monazite and zircon age obtained for the Neoarchean Kitoy granulite-gneiss terrane (SW Siberian Craton). Alumina gneisses of the Kitoy terrane indicate two-staged metamorphic evolution. The first stage of regional metamorphism (M1) occurred at high-amphibolite facies conditions at T = 780–800 ℃ and P = 8–9 kbar. The second stage (M2) belongs to MT-HT/LP type of metamorphism with the wide temperature interval 600–750 ℃ and pressure 2–4 kbar. Two age peaks were established on the basis of U-Pb monazite and zircon dating in gaet-anthophyllite gneisses. Both of them correspond to the Neoarchean age:the age of M1 falls into the interval of ca. 2489–2496 Ma, the age of M2–ca. 2446–2456 Ma. The high-temperature metamorphism of the Kitoy block and nearly coeval granitoid magmatism can be an evidence for the Neoarchean collision in SW Siberian craton.
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