| 湘南西山花岗质火山-侵入杂岩形成时代的确定 |
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| 引用本文：付建明,马昌前,谢才富,张业明,彭松柏.2004.湘南西山花岗质火山-侵入杂岩形成时代的确定[J].地球学报,25(3):303-308. |
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| 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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| 中文摘要:湖南南部西山火山侵入杂岩中3个代表性岩石单元(花岗岩、碎斑熔岩和流纹岩 )的产状、岩石化学、微量元素和同位素地球化学特征显示 ,它们同空间、同物质来源。全岩Rb Sr定年结果表明 :花岗岩、碎斑熔岩和流纹岩的形成时代分别为156±6Ma、159±2Ma和154±11Ma ,87Sr/86Sr初始值分别为0.71779、0.71738和0.71774 ,其中碎斑熔岩的锆石SHRIMP定年结果为156±2Ma ,它们在误差范围内基本相同 ,为中侏罗世晚期同一构造岩浆事件中陆壳活化的产物。 |
| 中文关键词:火山-侵入杂岩 离子探针UPb年龄 全岩Rb-Sr年龄 湖南 |
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| The Determination of the Formation Ages of the Xishan Volcanic-Intrusive Complex in Southern Hunan Province |
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| Abstract: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. |
| keywords:volcanic-intrusive complex SHRIMP U-Pb age whole-rock Rb-Sr age Hunan Province |
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