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HE Shi-ping, LI Rong-she, WANG Chao, YU Pu-sheng, GU Ping-yang, SHI Chao. 2010: Geochronology of gneissic plagioclase-amphibolite from Beidahe Group-complex in western segment of Qilian Mountains, China.. Geological Bulletin of China, 29(9): 1275-1280.
Citation: HE Shi-ping, LI Rong-she, WANG Chao, YU Pu-sheng, GU Ping-yang, SHI Chao. 2010: Geochronology of gneissic plagioclase-amphibolite from Beidahe Group-complex in western segment of Qilian Mountains, China.. Geological Bulletin of China, 29(9): 1275-1280.
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Geochronology of gneissic plagioclase-amphibolite from Beidahe Group-complex in western segment of Qilian Mountains, China.

  • Xi'an Institute of Geology and Mineral Resources,China Geological Survey, Xi'an 710054，Shaanxi，China;2. Chinese University of Geosciences, Beijing 100083，China

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  • SHRIMP U-Pb dating of detrital zircons from Beidahe Group-complex, one of the oldest metamorphic series in western segment of Qilian orogenic belt, shows the deposition occurred from 1400Ma to 863Ma rather than Paleoproterozoic previously studied. High resolution LA-ICP-MS in situ dating yields the age of 724.4±3.7 Ma from gneissic amphibolite in Beidahe Group-complex located in Dang River, Subei County, Gansu Province, which indicates the protolith age of gabbro. The age equals to the geological record of Rodinia supercontinent break-down event. Furthermore, the ages of 1949～1184 Ma for captured zircons also are yielded in Beidahe Group-complex. The study is of great significance to the existence of Rodinia supercontinent break-down event in the Qilian orogenic belt, and has further restricted the formation age of Beidahe Group-complex between 1400 and 724Ma.
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