P-T path of metamorphism and U-Pb monazite and zircon age of the Kitoy
terrane: Implication for Neoarchean collision in SW Siberian Craton
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Abstract
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 ¼ 780–800 C and P ¼ 8–9 kbar. The second stage (M2) belongs to MT-HT/LP type of
metamorphism with the wide temperature interval 600–750 C and pressure 2–4 kbar. Two age peaks were
established on the basis of U-Pb monazite and zircon dating in garnet-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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