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    中国百强科技报刊

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    Volume 38 Issue 4
    Jul.  2013
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    Article Contents
    RUAN Lin-sen, ZHAO Peng-da, HU Guang-dao, YANG Xiao-yong, HOU Li-wei, CHEN Ling-kang, ZHAO Shan-lan, 2013. SHRIMP U-Pb Dating of Greenschist from Dashuigou Schiefer, Shimian County, Shichuan Province and Its Geological Significance. Earth Science, 38(4): 663-676. doi: 10.3799/dqkx.2013.067
    Citation: RUAN Lin-sen, ZHAO Peng-da, HU Guang-dao, YANG Xiao-yong, HOU Li-wei, CHEN Ling-kang, ZHAO Shan-lan, 2013. SHRIMP U-Pb Dating of Greenschist from Dashuigou Schiefer, Shimian County, Shichuan Province and Its Geological Significance. Earth Science, 38(4): 663-676. doi: 10.3799/dqkx.2013.067

    SHRIMP U-Pb Dating of Greenschist from Dashuigou Schiefer, Shimian County, Shichuan Province and Its Geological Significance

    doi: 10.3799/dqkx.2013.067
    • Received Date: 2013-02-23
    • Publish Date: 2013-07-01
    • Located at the central of the Anning River discordogenic fault, the binding site of the Songpan-Ganze orogenic belt and the Yangtze block, Dashuigou schiefer has attracted increasing attention of researchers regarding to its special tectonic site and the occurred tellurium deposit. In order to provide chronologic evidences for reconstructing tectonic and magmatic geochronic evolution of areas around Dashuigou and the western margin of the Yangtze block in Shichuan, as well as for locating time of Dashuigou schiefer, zircon ages of the greenschist from Dashuigou were determined by SHRIMP U-Pb dating technique. Five age groups of the zircons with different characteristics of inner texture and cosmetics are obtained and subdivided from the greenschist of Dashuigou schiefer which should contain great proportions of sediments in the protolith. Ages of 2467-2430Ma from remained detrital magma zircons shows the mass transportation of Archaean-early proterozoic basement, whereas ages of 790.5-762.5Ma probably represent the magmatic event around Dashuigou on the background of Rodinia crack and upwelling mantle in early neoproterozoic. Metamorphism and magmation generated by orogenics and post orogenics are documented by ages of 696.8-642.9Ma from the magmatic zircons. Zircons of 262.0-220.0Ma ages are inferred to have been originated from alkalic rock nearby related to the Emeishan movement.216.5-167.1Ma ages of typical new growth and re-crystallized zircons caused by hydrothermal alteration reveal the post-magmatic hydrothermal activity. Dashuigou schiefer is probably allochthonic thrust sheet, and ages from magma zircons and those thermal genetics bound its general locating time to the interval from 220.0Ma to 167.1Ma.

       

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