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《Acta Geoscientica Sinica》 2009-03
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Isotopic Dating of Basalt from Gongpoquan Group in Yingmaotuo Area of the Beishan Mountain,Gansu Province,and Its Geological Significance

WANG Li-she1), YANG Jian-guo1), WANG Yu-xi1), LEI Yong-xiao1) , XIE Chun-lin1), CAO Hong-xia2), YANG Peng-fei1), QI Ya-lin3), GAO Ming4) 1) Xi’an Institute of Geology and Mineral Resources, Xi’an, Shannxi 710054; 2) Research Institute of Shannxi YanChang Petroleum Group, CO., LTD, Xi’an, Shannxi 710075; 3) Research Institute of Changqing Oil Field, Xi’an, Shannxi 710021; 4) No. 224 Geological Party, Shannxi Geological Bureau of Nuclear Industry, Xi’an, Shannxi 710024  
The U-Pb isotopic dating of zircon from basalt of Gongpoquan Group in Yingmaotuo area of the Beishan Mountain yields the ages of (333.1±9.8) Ma and (358±17) Ma. The former indicates that the basic rocks were formed in Early Carboniferous and the latter suggests that the Gongpoquan Group included some Devonian events. A comparative study of this discovery and fossils of Gongpoquan Group has led the authors to believe that this group is composed of Silurian, Devonian and Lower Carboniferous strata instead of merely Silurian strata. In other words, the effect of subduction and collision between the Tarim plate and the Kazakhstan plate probably continued into Lower Carboniferous.
【Fund】: 中国地质地调查局战略性矿产远景调查项目(编号:矿调[2004]8-2号);; 中央地质勘查基金2007年度地质矿产勘查项目(编号:2007651139)联合资助
【CateGory Index】: P588.145;P597.3
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