| 湘南西山花岗质火山-侵入杂岩形成时代的确定 |
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| 关键词:volcanic-intrusive complex SHRIMP U-Pb age whole-rock Rb-Sr age Hunan Province |
| 基金项目:宜昌地质矿产研究所科技发展基金(编号:K200302)，中国地质调查局基础地质综合研究项目(编号:200113900018) |
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| 摘要: |
| The Determination of the Formation Ages of the Xishan Volcanic-Intrusive Complex in Southern Hunan Province |
| The occurrences, geochemistry and trace element and isotopic characteristics of three representative rock units, namely granite, clastoporphyritic lava and rhyolite, in Xishan granitic volcanic-intrusive complex of southern Hunan, indicate that they have identical space and material resources. The whole rock Rb-Sr dating shows that the ages of these three units are 156±6 Ma,159±2 Ma and 154±11 Ma, respectively, and the zircon SHRIMP age of the clastoporphyritic lava is 156±2 Ma. These age data show that the Xishan complex was formed almost at the same time, and might have been the late stage product of the Middle Jurassic magmatism. |
| FU Jian-ming,MA Chang-qian,XIE Cai-fu,ZHANG Ye-ming,PENG Song-bai.2004.The Determination of the Formation Ages of the Xishan Volcanic-Intrusive Complex in Southern Hunan Province[J].Acta Geoscientica Sinica,25(3):303-308. |
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