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- W2348832178 abstract "The paper reports a new discovery of the late Triassic blueschists and glaucophanes in Caiduo Caka,Shuanghu area,central Qiangtang,northern Tibet,China and its geological significance. Based on the field survey and measurement of the tectonic m langes geological section in the Caiduo Caka,Shuanghu region,the middle-high pressure metamorphic rocks (glaucophanes-bearing blueschists) were found to occur in the grey-green metamorphic basic volcanic rocks(green schist) along the sixth bed of this section. The petrology of the blueschists,and the mineralogy and petrochemistry of the glaucophanes have been researched in detail. Glaucophanes minerals were collected from the blueschists for 40Ar/39Ar isotopic dating. The testing yielded a plateau age of 209±4 Ma and an isochronal age of 216±4 Ma,both of which are basically consistent with each other,suggesting that they formed at the Norian stage of the late Triassic. The ages couple with regional middle-high pressure metamorphic event of the Gangmar-Hongjishang-Shuanghu blueschists belts in central Due to the particular tectonic settings and geological significance of glaucophanes and blueschists occurrence,the discovery of the Caiduo Caka blueschists in eastern Shuanghu area and the 40Ar/39Ar isotopic chronological research have not only provided new important data to the Shuanghu tectonic m lange composition and the glaucophanes isotopic chronology,and but also solved the key geological problem about the extension of the Longmucuo-Shuanghu tectonic m lange zone in central Qiangtang. Research also indicates that the middle-high pressure blueschist metamorphic rocks zone extending discontinuously over 600 km from Gangmacuo-Hongjishan-Rongma-Gaercuo,sequentially eastward to Caidaocaka in central Qiangtang northern Tibet are bound up with the deep subduction orogenesis of the Longmucuo-Shuanghu tectonic m lange zone during the late Triassic." @default.
- W2348832178 created "2016-06-24" @default.
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- W2348832178 date "2010-01-01" @default.
- W2348832178 modified "2023-09-23" @default.
- W2348832178 title "~(40)Ar/~(39)Ar Isotopic Dating of the Glaucophane in Caiduo Caka,Central Qiangtang Area,Northern Tibet,China and Its Geological Significance" @default.
- W2348832178 hasPublicationYear "2010" @default.
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