| 鄂尔多斯盆地西缘汝箕沟大岭－鼓鼓台玄武岩锆石U-Pb定年及其构造意义 |
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| 关键词:western margin of Ordos basin Daling-Gugutai basalt U-Pb zircon dating trace elements tectonic implication |
| 基金项目:国家重点基础研究发展规划项目(编号: 2001CB409801)和中国石油长庆油田分公司 |
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| 摘要: |
| U-Pb Zircon Dating of the Daling-Gugutai Basalt in Rujigou on the Western Margin of Ordos Basin |
| Based on an analysis of data obtained by such means as microscope observation, geochemistry and ELA-ICPMS, the authors studied the Daling-Gugutai basalt in such aspects as the internal structure, element composition and original location dating of its zircons. It is shown that the Daling-Gugutai basalt is a typical tholeiitic basalt, with its zircon ages being 1966±15Ma, 344±22 Ma and 241±7Ma, respectively. Of these data, 1966±15Ma is the age of inherited zircon, 344±22Ma is the first fractional crystallization age of magma, and 241±7Ma is the age of zircon crystallization during the last eruption of basaltic magma. It is thus suggested that the Helan Mountain area was probably a rift under an extending condition in Middle-Late Triassic period. |
| YANG Hua,FU Jin-hua,OUYANG Zheng-jian,SUN Liu-yi,MA Zhan-rong.2010.U-Pb Zircon Dating of the Daling-Gugutai Basalt in Rujigou on the Western Margin of Ordos Basin[J].Acta Geoscientica Sinica,31(2):229-236. |
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