【摘 要】
：
The South Qinling terrain is located at the northern margin of the Yangtze Block.Neoproterozoic volcanic-sedimentary sequences of the Yaolinghe Group play the most significant role in studying the tec
【机 构】
：
Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,
【出 处】
：
The International Conference on Continental Dynamics(2014年大陆
论文部分内容阅读
The South Qinling terrain is located at the northern margin of the Yangtze Block.Neoproterozoic volcanic-sedimentary sequences of the Yaolinghe Group play the most significant role in studying the tectono-magmatic evolution of the South Qinling.Based on temporal and spatial geochemical variations,the Yaolinghe Group can be divided into three volcanic cycles.Basaltic lavas of cycle 1 crystallized at 847 ±8 Ma and exhibit typical island arc basalt characteristics with enrichment of LILEs (Th,U) and LREEs,depletion of HFSEs (Nb,Ta,Zr,Hf,Ti) and homogeneous initial 143Nd/144Nd ratios ranging from 0.51162 to 0.51172 corresponding to initial εNd values of +1.6 to +3.5.
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