| 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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| 作者姓名： | YANG Jingsui XU Zhiqin SONG Shuguang ZHANG Jianxin WU Cailai SHI Rendeng LI Haibing Maurice BRUNEL and Paul TAPPONNIER Institute of Geology Chinese Academy of Geological Science Baiwanzhuang Rd. Beijing China |
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| 作者单位： | YANG Jingsui，XU Zhiqin，SONG Shuguang，ZHANG Jianxin，WU Cailai，SHI Rendeng，LI Haibing，Maurice BRUNEL and Paul TAPPONNIER Institute of Geology，Chinese Academy of Geological Science，26 Baiwanzhuang Rd.，Beijing 100037，China Department of Earth Sciences，University of Montpellier II，Montpellier，France Institut de Physique du Globe，75252 Paris Cedex 05，France |
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| 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.
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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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| Authors: | YANG Jingsui XU Zhiqin SONG Shuguang ZHANG Jianxin WU Cailai SHI Rendeng LI Haibing Maurice BRUNEL and Paul TAPPONNIER Institute of Geology Chinese Academy of Geological Science Baiwanzhuang Rd Beijing China |
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| Institution: | YANG Jingsui,XU Zhiqin,SONG Shuguang,ZHANG Jianxin,WU Cailai,SHI Rendeng,LI Haibing,Maurice BRUNEL and Paul TAPPONNIER Institute of Geology,Chinese Academy of Geological Science,Baiwanzhuang Rd.,Beijing,China Department of Earth Sciences,University of Montpellier II,Montpellier,France Institut de Physique du Globe,Paris Cedex,France |
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| Abstract: | 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. |
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| Keywords: | UHP metamorphism coesite eclogite Qinghai-Tibet plateau North Qaidam Mountains |
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