| 黄勇,陈能松,戴传固,韩颖平,白龙,邓小杰.罗甸玉矿区基性岩床内中性岩的锆石U-Pb定年及意义[J].贵州地质,2017,34(2):90-96 |
| 罗甸玉矿区基性岩床内中性岩的锆石U-Pb定年及意义 |
| Zircon U-Pb Dating and Its significance of Intermediate Intrusive Rocks Within the Basic Sill in Luodian Nephrite Deposit, Guizhou province |
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| DOI： |
| 中文关键词: 中酸性侵入岩 锆石U-Pb定年 罗甸玉矿 贵州 |
| 英文关键词:Intermediate-acid intrusive rocks LA-ICP-MS zircon U-Pb dating Luodian nephrite deposit Guizhou province |
| 基金项目:贵州省科技厅重大科技专项“罗甸玉开发利用关键技术研究与产业化”项目（编号：黔科合重大专项字[2014]6003号）。 |
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| 中文摘要: |
| 近几年笔者等在贵南的罗甸玉矿区发现了较多中酸性岩脉和岩囊。应用 LA-ICP-MS U-Pb法测定其中的二长闪长岩的锆石年龄为255.2 Ma±3.1 Ma，为晚二叠世吴家坪晚期。中酸性岩的年龄与罗甸辉绿岩及区域上峨眉山大岩浆岩省岩浆侵位年龄一致，因而共同形成于拉张构造环境，可能是基性岩浆结晶分异的产物。 |
| 英文摘要: |
| No Paleozoic intermediate-acid intrusive rocks have been reported in Guizhou province in the past years. Recent work of the authors indentified some intermediate-acid dykes or porkets in Luodian nephrite deposit, southern Guizhou. U-Pb dating on zircons from one of the monzonitic diorites yielded 255.2±3.1 Ma, indicating the dyke formed in late Wujiaping period of the Late Permian. This age is consistent with the emplacement ages of the Luodian diabase and Emeishan Large Igneous Province, and therefore, suggests that the intermediate-acid intrusive rocks jointly formed in an extensional tectonic environment. The Intermediate-acid intrusive rocks might produc via differentiation crystallization of the basic magma. |
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