Zircon U-Pb SHRIMP ages of high-pressure granulite in Yushugou ophiolitic terrane in southern Tianshan and their tectonic implications  

作　　者：ZHOUDingwu SULi JIANPing WANGRunsan LIUXiaoming LUGuanxiang WANGJuli 

机构地区：[1]KeyLaboratoryofContinentalDynamicsoftheMinistryofEducationandDepartmentofGeology,NorthwestUniversity,Xi'an710069,China [2]BeijingSHRIMPCenter,Beijing100037,China

出　　处：《Chinese Science Bulletin》2004年第13期1415-1419,共5页

摘　　要：Zircons from two high-pressure granulite samples from the Yushugou ophiolitic terrane, southern Tianshan have been investigated by cathodoluminescence, LAICPMS and ion microprobe (SHRIMP) for their internal textures, trace elemental compositions and in situ dating. Theweighted mean ages of these two samples are 392±7 and 390±11 Ma, respectively, representing the granulite-facies metamorphic age of the ophiolitic terrane, and indicating that the southern Tianshan ocean initiated its northward subduction since the early Devonian.Zircons from two high-pressure granulite samples from the Yushugou ophiolitic terrane, southern Tian shan have been investigated by cathodoluminescence, LA ICPMS and ion microprobe (SHRIMP) for their internal textures, trace elemental compositions and in situ dating. The weighted mean ages of these two samples are 392±7 and 390±11 Ma, respectively, representing the granulite-facies meta morphic age of the ophiolitic terrane, and indicating that the southern Tianshan ocean initiated its northward subduction since the early Devonian.

关 键 词：锆石 SHRIMP U-PB 年代测定 高压麻粒岩 表面形态 天山 

分 类 号：P618.85[天文地球—矿床学] P588.34[天文地球—地质学]