| 南蒙古地区西南欧玉花岗岩LA-MC-ICP-MS锆石U-Pb定年及其地质意义 |
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| 引用本文： | 陈正,李俊建.南蒙古地区西南欧玉花岗岩LA-MC-ICP-MS锆石U-Pb定年及其地质意义[J].地质通报,2016,35(4):578-582. |
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| 作者姓名： | 陈正 李俊建 |
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| 作者单位： | 1. 中国地质调查局发展研究中心, 北京 100037;2. 中国地质调查局天津地质调查中心, 天津 300170 |
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| 基金项目： | 中国地质调查局项目(编号:1212010561510、1212010811061、1212011120330) |
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| 摘 要： | 对蒙古国南戈壁省东部的西南欧玉岩体黑云母花岗岩锆石进行了阴极发光照相,结果显示,其具有明显的振荡环带,为典型的岩浆锆石特征。对22颗锆石进行了LA-MC-ICP-MS U-Pb年龄测定,结果显示,21个测点的~(206)Pb/~(238)U年龄介于334±2~335±2Ma之间,年龄加权平均值为335±1Ma,表明西南欧玉岩体形成于早石炭世。
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LA-MC-ICP-MS zircon U-Pb dating of granite of southwestern Oyu Tolgoi region in South Mongolia and its geological significance |
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| CHEN Zheng and LI Junjian.LA-MC-ICP-MS zircon U-Pb dating of granite of southwestern Oyu Tolgoi region in South Mongolia and its geological significance[J].Geologcal Bulletin OF China,2016,35(4):578-582. |
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| Authors: | CHEN Zheng and LI Junjian |
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| Institution: | 1. Development and Research Center, China Geological Survey, Beijing 100037, China;2. Tianjin Center of Geological Survey, China Geological Survey, Tianjin 300170, China |
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| Abstract: | The zircons from biotite granite in southwestern Oyu Tolgoi region show clear oscillatory zoning, indicating that they were formed by normal crystallization of magma. U-Pb dating of 22 zircons was conducted by LA-MC-ICP-MS method. The re-sults show that the data of 21 zircons are clustered around the concordia of 334±2~335±2Ma, yielding a weighted mean 206Pb/238U age of 335.6±1Ma, which implies that the crystallization of biotite granite in southwestern Oyu Tolgoi region occurred in Early Car-boniferous. |
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| Keywords: | porphyry copper belt LA-MC-ICP-MS zircon U-Pb dating Omno Govi Mongolia |
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