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Discussion on the Tectonic Setting and Geochemical Characteristics of Sandstones from Carboniferous to Triassic in Zhidoi-Zadoi Area,Southern Qinghai

ZHAO Xiao-ming WANG Jian-xiong NIU Zhi-jun TANG Zhao-yang YAO Hua-zhou(Yichang Institute of Geology and Mineral Resources,Yichang Hubei 443003)  
The major element geochemical analysis of sandstone and siltstones samples were performed for tectonic setting discrimination and discussion the nature and evolution of northern Qiangtang basin in Zhidoi-Zadoi area,southern Qinghai.The result of study indicates that the tectonic settings of provenances are passive continental margin in the Early Carboniferous,passive continental margin,active continental margin and continental island arc in the Early and Middle Permian,passive continental margin,active continental margin and continental island arc in the Late Triassic.Along with the stratigraphy,sedimentology and petrology,the nature of basin evolved from craton basin in the Early Carboniferous to rift-basin in the Early and Middle Permian and passive continental margin basin in the Early and Middle Triassic to back-arc basin in the Late Triassic,and this is sedimentation responding to evolvement of Jinshajiang suture belt and Garze-Litang suture belt in study area.
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