| 内蒙古东乌旗地区格根敖包组火山岩锆石LA-MC-ICP-MS U-Pb年龄及其地质意义 |
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| 关键词:Gegen Obo Formation Baoligaomiao Formation East Ujimqin Banner |
| 基金项目:中国地质调查局地质调查项目“中国及邻区海陆大地构造研究”(编号: 12120113013700);“中国及邻区小比例尺地质图和大地构造图的编制”(编号: 12120113013800); 国土资源调查项目(编号: 1212011121078) |
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| LA-MC-ICP-MS Zircon U-Pb Dating of the Volcanic Rocks from the Gegen Obo Formation in East Ujimqin Banner Area, Inner Mongolia, and Its Significance |
| The Gegen Obo Formation consists of intermediate-acidic lava and volcaniclastic as well as terrigenous clastic rocks, and is considered to be marine-continental alternative facies according to its abundant fossils and petrogenetic features. However, its age is still under discussion. The authors have obtained zircon LA-MC-ICP-MS U-Pb ages of (307.3±0.99) Ma and (311.6±1.3) Ma from volcanic rocks of the Gegen Obo Formation, suggesting Late Carboniferous. Combined with previous fossil evidence and stratigraphic studies of related rocks，the authors assigned the upper sediments of Gegen Obo Formation (member 3, 4 and 5) to Early Permian, and the lower part (member 1 and 2) to Late Carboniferous. Thus the age of Gegen Obo Formation is confined to late Carboniferous-early Permian. The lower parts (member 1 and 2) of Gegen Obo Formation and Baoligaomiao Formation have the same upper limit of age, both belonging to late Carboniferous. |
| ZHU Jun-bin,SUN Li-xin,REN Ji-shun,LI Shan.2015.LA-MC-ICP-MS Zircon U-Pb Dating of the Volcanic Rocks from the Gegen Obo Formation in East Ujimqin Banner Area, Inner Mongolia, and Its Significance[J].Acta Geoscientica Sinica,36(4):466-472. |
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