| Caledonian Low-Temperature Granulite-Facies Metamorphism in the West Kunlun Orogenic Belt-SHRIMP Chronological Evidence from Zircon |
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| 作者姓名： | 张传林 沈加林 王爱国 赵宇 郭坤一 李春海 |
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| 作者单位： | Institute of Geochemistry，Chinese Academy of Sciences，Institute of Geochemistry，Chinese Academy of Sciences，Institute of Geochemistry，Chinese Academy of Sciences，Institute of Geochemistry，Chinese Academy of Sciences，Institute of Geochemistry，Chinese Academy of Sciences，Institute of Geochemistry，Chinese Academy of Sciences Guiyang 550002，China Nanjing Institute of Geology and Mineral Resources，Nanjing 210016，China，Guiyang 550002，China，Guiyang 550002，China，Guiyang 550002，China，Guiyang 550002，China，Guiyang 550002，China |
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| 基金项目： | Partoftheresultsfromtheresearchproject“ResearchontheWestKunlunpre \|Cambriantectonicevents”undertheprogram“ResearchontheimportantgeologicalproblemsofChina’spre Cambrian” (No .2 0 0 1 1 390 0 0 70 )sponsoredbytheChinaNationalGeologicalSurveyingBureau |
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| 摘 要： | 1IntroductionTheWestKunlunorogenicbeltbordersontheTarimplateinthenorth ,linkswiththeKarakorum Qiangtangblockinthesouth ,iscutbytheAltunfaultintheeast,andextendswest wardstothePamirPlateau (BureauofGeologyandMineralResources,Xinjiang ,1 999;JiangChunfaetal.,2 0 0 0 ) .OnthebasisofthediscoveryoftheKudaophioliteandaseriesofstudies(DingDaoguietal.,1 996 ;PanYushengetal.,1 994 ,1 999;WangZhihongetal.,2 0 0 0 ;PanYushengetal.,2 0 0 0 ) ,thepreviousgeologicalworkerscommonlyacceptedthatthereh…
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Caledonian Low-Temperature Granulite-Facies Metamorphism in the West Kunlun Orogenic Belt-SHRIMP Chronological Evidence from Zircon |
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| ZHANG Chuanlin \\{,\},SHEN Jialin \\{\},WANG Aiguo \\{\},ZHAO Yu \\{\},GUO Kunyi \\{\},and LI Chunhai \\{\}.Caledonian Low-Temperature Granulite-Facies Metamorphism in the West Kunlun Orogenic Belt-SHRIMP Chronological Evidence from Zircon[J].Chinese Journal of Geochemistry,2003,22(4). |
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| Authors: | ZHANG Chuanlin \\{ \} SHEN Jialin \\{\} WANG Aiguo \\{\} ZHAO Yu \\{\} GUO Kunyi \\{\} and LI Chunhai \\{\} |
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| Institution: | ZHANG Chuanlin \+\{1,2)\},SHEN Jialin \+\{1)\},WANG Aiguo \+\{1)\},ZHAO Yu \+\{1)\},GUO Kunyi \+\{1)\},and LI Chunhai \+\{1)\} 1) |
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| Abstract: | The West Kunlun orogenic belt is located at the conjunction of the paleo-Asian tectonic system and the Tethys tectonic system. Petrological and mineralogical studies of the Early Cambrian metamorphic surface crust in this region have shown that in case the metamorphism reached low-temperature granulate facies,the typical mineral assemblage is biotite-garnet-silimanite-K feldspar-plagioclase-quartz. The peak metamorphic temperatures are within the range of 720 - 740℃ and the pressure is 0.6 GPa +. Three types of metamorphic zircon have been detected in the metamorphic rocks: the complex inclusion-bearing type; the early relic zircon inclusion-bearing type; and the inclusion-free type. SHRIMP age determination of these three types of metamorphic zircon have revealed that these zircons were formed principally during 400-460 Ma,indicating that pre-Cambrian metamorphic surface crust rocks underwent low-temperature granulite facies metamorphism during the Caledonian. In combination with the geological characteristics of this region,it is considered that when the oceanic basin was closed,there occurred intense intracontinental subduction ( type A),bringing part of the Early Cambrian metamorphic basement in this region downwards to the lower crust. Meanwhile,there were accompanied with tectonic deformation at deep levels and medium- to high-grade metamorphism. This study provided important chronological and mineralogical evidence for the exploration of the evolutionary mechanism and process of the West Kunlun Early Paleozoic. |
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| Keywords: | West Kunlun Caledonian tectonic event zircon SHRIMP age tectonic implication |
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