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Provenance and tectonic settings of Permian turbidites from the Beishan mountains,NW China:Implications for the Late Paleozoic accretionary tectonics of the southern Altaids

Provenance and tectonic settings of Permian turbidites from ...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Qianqian Guo Wenjiao Xiao Brian F.Windley Qigui Mao Chunming Han Junfeng Qu Songjian Ao Jiliang Li Dongfang Song Yong Yong State Key Laboratory of Lithosphenc Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Department of Geology University of Leicester Beijing Institute of Geology for Mineral Resources State Key laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences

The Beishan orogenic belt,which connects the Tianshan suture on the west and Solonker suture on the east,contains key evidence for the termination time of the southern *** for evaluating different controversial tectonic models are Permian marine volcaniclastic arenites in the Liuyuan and Heishankou areas,which are dominated by greywackes and lenticular pebbly litharenites that contain grading,groove marks,and erosional bases,which provide evidence of turbidity *** from the Liuyuan section are dominated by angular basaltic,andesitic,and feldspar fragments,but sandstones from the Heishankou section mainly consist of andesitic and felsic volcanic *** relations suggest derivation from two different *** element compositions suggest that the source rocks of the Heishankou litharenites were more SiO-rich than those at *** at Heishankou are characterized by lower Ni-Co-Cr-V and slightly higher Th and La contents than those at *** indicates that the litharenites in the Liuyuan and Heishankou areas were derived from intermediatemafic and intermediate-felsic source rocks,*** setting discrimination plots suggest that the Liuyuan sandstones were deposited as detritus from an oceanic island arc,but the Heishankou sediments from an Andean continental *** petrological and geochemical data from these two types of Permian turbidites suggest that an arc-continent collision took place in the Early Permian,and this is consistent with the Permian termination of the southern Altaids.

关键词： eeishan mountains Permian turbidites Geochemistry Provenance Tectonic setting Southern Altaids

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