| Formation Environment of the High-Pressure Metamorphic Rocks, Western Tianshan, Xinjiang, China |
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| 作者姓名： | GAO Jun WANG Zongxiu |
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| 作者单位： | GAO Jun;WANG Zongxiu (Institute of Geology，Chinese Academy of Geological Sciences，Beijing 100037，China) ZHANG Lifei;Akebaier SHADEKE (Department of Geology，Peking University，Beijing 100871，China) |
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| 摘 要： | 1.IntroductionFromexperimefltalphaseequilibrium,stableisotOPe,andthermo-barometricstudies,ProgradebineschistdineralparageneseshavebeenproducedexclusivelyatrelativelyhighPadratios(DeRoever,1956;Miyashiro,1961;DobretsovandSobolev,1984;Emst,1973,1988;Maruyamaetal.,1996).InthelastthreedeCades,withtheadvanceofplatetectonics,manygeologistssuggestedthatblueschists,representinghigh-Pressurelow-tCmperamre~rphism,areformedbysubductionofoceanicplate(Emst,1973).Blueschistshavealsobeenregardedasoneof…
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Formation Environment of the High-Pressure Metamorphic Rocks, Western Tianshan, Xinjiang, China |
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| GAO Jun,WANG Zongxiu.Formation Environment of the High-Pressure Metamorphic Rocks, Western Tianshan, Xinjiang, China[J].大陆动力学(英文版),1997(1). |
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| Authors: | GAO Jun WANG Zongxiu |
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| Abstract: | The western Tianshan high-pressure metamorphic rocks occur within the greenschist facies country rocks as small discrete blocks, lenses, bands, laminae or intercalated slabs. The protoliths of blueschists and eclogites include N-MORB, E-MORB, OIB, gabbro, basic volcanidastic rock, greywacke and other rock types. Metamorphic assemblages and geochemical dais of major, trace and rare earth elements indicate that the high-pressure rocks were formed within a B-type subduction zone along the north margin of the Early Paleozoic South Tianshan Ocean between the Tarim and the Yili-Central Tianshan plates. |
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| Keywords: | high-pressure metamorphic rocks B-type subduction zone western Tianshan |
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