| 甘肃北山营毛沱地区公婆泉群中玄武岩
同位素定年及其地质意义 |
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| 关键词:Beishan Mountain Gongpoquan Group basalt isotopic age |
| 基金项目: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)和中央地质勘查基金2007年度地质矿产勘查项目(编号: 2007651139) |
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| Isotopic Dating of Basalt from Gongpoquan Group in Yingmaotuo Area of the Beishan Mountain, Gansu Province, and Its Geological Significance |
| 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. |
| WANG Li-she,YANG Jian-guo,WANG Yu-x,LEI Yong-xiao,XIE Chun-lin,CAO Hong-xia,YANG Peng-fei,QI Ya-lin,GAO Ming.2009.Isotopic Dating of Basalt from Gongpoquan Group in Yingmaotuo Area of the Beishan Mountain, Gansu Province, and Its Geological Significance[J].Acta Geoscientica Sinica,30(3):363-368. |
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