P-T path of metamorphism and U-Pb monazite and zircon age of the Kitoy terrane: Implication for Neoarchean collision in SW Siberian Craton

作者：Vasiliy P.Sukhorukov,Valentina B.Savel’eva,Yingde Jiang,Zhiyong Li

摘要：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 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.

发文机构：V.S.Sobolev Institute of Geology and Mineralogy SB RAS Novosibirsk State University Institute of the Earth Crust SB RAS State Key Laboratory of Isotope Geochemistry

关键词：SiberiancratonNEOARCHEANKitoyterraneMETAMORPHISMP-Tpath

分类号： P59[天文地球—地球化学]