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Disintegration and age of basement metamorphic rocks in Qiangtang, Tibet, China

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Abstract

Comprehensive studies on lithologic association, provenance of metacongelometre, characteristics of metamorphism and deformation, and207Pb/206Pb-dating of single-zircon for metamorphic rocks distributed in Chabu-Chasang areas in Qiangtang block indicate that most of them belong to Middle Proterozoic metamorphic basement except silicilith member ascribed to Triassic. Disintegrated basement strata are called Gemuri group and Guoganjianianri group; they are different in histories of metamorphism and deformation. The single-zircon207Pb/206Pb-ages provide excellent evidence for the existence of an Archean continent nucleus around study areas. Some thermal event ages such as 929–1016 and 509–548 Ma are recorded in Gemuri group.

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Authors and Affiliations

  1. State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation, Chengdu University of Technology, 610059, Chengdu, China

    Wang Guozhi & Wang Chengshan

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  1. Wang Guozhi
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  2. Wang Chengshan
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Correspondence to Wang Guozhi.

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Wang, G., Wang, C. Disintegration and age of basement metamorphic rocks in Qiangtang, Tibet, China. Sci. China Ser. D-Earth Sci. 44 (Suppl 1), 86–93 (2001). https://doi.org/10.1007/BF02911975

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  • DOI: https://doi.org/10.1007/BF02911975

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