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High-pressure granulite from Western Kunlun,northwestern China:Its metamorphic evolution,zircon SHRIMP U-Pb ages and tectonic implication

查看全文 作　　者：QU [1]JunFeng;ZHANG [1]LiFei;AI [2]YongLiang;L [1]Zeng;WANG [3]JianPing;ZHOU [1]Hui;WANG [3]ShiYan 高影响力作者 机构地区：[1]MOE Key Laboratory of Orogenic Belts and Crustal Evolution,School of Earth and Space Science,Peking University,Beijing 100871,China;[2]Henan Polytechnic University,Jiaozuo 454100,China;[3]Geological Survey of Henan Province,Zhengzhou 450007,China高影响力机构 出　　处：《Science China Earth Sciences》索引2007年第50卷第7期,共11页高影响力期刊 基　　金：Supported by Geological Survey of Henan Province and the National Natural Sci-ence Foundation of China (Grant No. 40325005) 摘　　要：High-pressure mafic granulites occurring as lenticular bodies within garnet-amphibolites in Kangxiwar Fault have been first reported in this paper. The P-T conditions of two metamorphic stages were ob-tained using calibrated geothermal barometers and ThermoCalc Program. The peak metamorphic con-dition of these high-pressure granulites is about 760―820℃,1.0―1.2 GPa and the retrograde meta-morphic condition is about 620―720℃,0.7―0.8 GPa. The petrological studies show that they have a near-isobaric cooling P-T path which suggests that the Western Kunlun underwent initial crustal thickening,subsequent exhumation and cooling. The SHRIMP zircon U-Pb dating gives two groups of ages for high-pressure granulites. One is 177±6 Ma which is obtained from the rim of the zircon. We consider this age should be the metamorphic age. And the other is 456±30 Ma which is obtained from the core of the zircon and should be the protolith age. The formation of these high-pressure granulites in western Kunlun is closely correlated with the evolution of the Paleo-Tethys and has important im-plications for the research on Tethys and Paleo-Asian tectonic zone. 关 键 词：WESTERN KUNLUN Kangxiwar Fault high-pressure GRANULITE P-T path SHRIMP U-PB DATING of ZIRCON
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