Subduction of Continental Crust in the Early Palaeozoic North Qaidam Ultrahigh-Pressure Metamorphic Belt, NW China:Evidence from the Discovery of Coesite in the Belt

查看全文 作　　者：[1]杨经绥;[1]许志琴;[1]宋述光;[1]张建新;[1]吴才来;[1]史仁灯;[1]李海兵;Maurice [2]BRUNEL;Paul [3]TAPPONNIER

机构地区：[1]Institute of Geology, Chinese Academy of Geological Science, 26 Baiwanzhuang Rd., Beijing 100037, China;[2]Department of Earth Sciences, University of Montpellier II, Montpellier, France;[3]Institut de Physique du Globe, 75252 Paris Cedex 05, France;

出　　处：《Acta Geologica Sinica(English Edition)》索引2002年第76卷第1期,共6页

基　　金：the National Natural Science Foundation of China grant 49732070 ; the Chinese National Key Project for Fundamental Research on the TibetanPlateau(G1998040805). 摘　　要：Coesite was discovered as inclusions in zircon separates from pelitic gneiss associated with a large eclogite body in the North Qaidam ultrahigh-pressure (UHP) terrane. Some graphite inclusions were also found. This finding suggested the occurrence of in-situ UHP metamorphism and that the terrane was most likely recrystallized at pressures below the diamond stability field. It supported other previous indirect UHP evidence, such as polycrystalline quartz inclusions in eclogitic garnet, quartz lamellae in omphacite and P-T estimates for both eclogite and garnet peridotite. The U-Pb and Sm-Nd ages of the North Qaidam eclogite indicated that subduction of continental crust occurred in the Early Palaeozoic, which probably recorded a collision between the Sino-Korean and Yangtze plates. 关键词：UHP metamorphism, coesite, eclogite, Qinghai-Tibet plateau, North Qaidam Mountains

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Subduction of Continental Crust in the Early Palaeozoic North Qaidam Ultrahigh-Pressure Metamorphic Belt, NW China:Evidence from the Discovery of Coesite in the Belt

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