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- W2367024199 abstract "Thin layer and veinlet of granitic leucosomes are widely distributed within felsic gneiss in Xitieshan area of the North Qaidam ultrahigh-pressure(UHP) metamorphic terrane,western China. Anatexis of the felsic gneiss is evidenced by petrological study in field and thin section:(1) mineral assemblage of Kfs + Qz + Pl within garnet;(2) cuspate wedge-shaped pockets consisting of Kfs + Qz + Pl ± Mus along boundary of plagioclases;(3) microcline recognized along grain boundary of irregular muscovite;(4)string of beads along boundary of quartz,plagioclase or K-feldspar. A combined study of cathoduluminescence(CL) images and U-Pb dating results indicate that the zircons from granitic leucosome show obvious core,mantle and rim with distinct ages. High-luminescent inherited magmatic cores record a Neoproterozoic age of approximately 910Ma,with high Th /U ratios. The low-luminescent unzoning metamorphic mantle record eclogite-facies metamorphic age of approximately 450Ma. The overgrowth rims are similar to typical anatectic zircon in terms of pronounced oscillatory zoning and low Th /U ratios,which gave a U-Pb age of 432 ±3Ma. A combined study of field observation,microscopic textures and zircon U-Pb dating indicates that the granitic leucosome could be drived from parital melting of the host felsic gneiss at HP granulite-facies conditions,probably triggered by breakdown of muscovite. These data together with previous research imply that the deeply subducted continental crust could have experienced multiply anatexis during subduction /collision and exhumation." @default.
- W2367024199 created "2016-06-24" @default.
- W2367024199 creator A5047327727 @default.
- W2367024199 date "2014-01-01" @default.
- W2367024199 modified "2023-09-24" @default.
- W2367024199 title "Partial melting of subducted continental plate during exhumation from the North Qaidam UHP terrane,western China" @default.
- W2367024199 hasPublicationYear "2014" @default.
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