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- W2384700596 abstract "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 2 467-2 430 Ma from remained detrital magma zircons shows the mass transportation of Archaean-early proterozoic basement, whereas ages of 790.5-762.5 Ma 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 696.8-642.9 Ma from the magmatic zircons. Zircons of 262.0-220.0 Ma ages are inferred to have been originated from alkalic rock nearby related to the Emeishan movement.216.5-167.1 Ma 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 220.0 Ma to 167.1 Ma." @default.
- W2384700596 created "2016-06-24" @default.
- W2384700596 creator A5055186160 @default.
- W2384700596 date "2013-01-01" @default.
- W2384700596 modified "2023-09-28" @default.
- W2384700596 title "SHRIMP U-Pb Dating of Greenschist from Dashuigou Schiefer, Shimian County, Shichuan Province and Its Geological Significance" @default.
- W2384700596 hasPublicationYear "2013" @default.
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