| 金沙江-哀牢山断裂带几个富碱斑岩体的锆石U-Pb定年及地质意义 |
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| 引用本文： | 李勇,莫宣学,喻学惠,黄行凯,和文言.金沙江-哀牢山断裂带几个富碱斑岩体的锆石U-Pb定年及地质意义[J].现代地质,2011,25(2):189-200. |
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| 作者姓名： | 李勇 莫宣学 喻学惠 黄行凯 和文言 |
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| 作者单位： | 地质过程与矿产资源国家重点实验室,中国地质大学地球科学与资源学院,北京,100083 |
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| 基金项目： | 国家重点基础研究发展计划"973"项目，国家自然科学基金 |
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| 摘 要： | 运用LA-ICP-MS锆石U-Pb同位素定年方法测定了金沙江-哀牢山断裂带内4个富碱斑岩的年龄.结果表明:剑川地区角闪正长斑岩形成时间为(37.6±2.2)Ma,姚安地区黑云母二长斑岩具有2组锆石U-Pb年龄数据,较年轻的一组为(36.86±0.63)Ma,较老的一组为(40.41±0.24)Ma,姚安黑云母角闪正长斑...
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| 关 键 词： | 富碱斑岩 金沙江-哀牢山断裂带 LA-ICP-MS锆石U-Pb定年 新生代 岩浆作用 |
Zircon U-Pb Dating of Several Selected Alkali-rich Porphyries from the Jinshajiang-Ailaoshan Fault Zone and Geological Significance |
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| LI Yong,MO Xuan-xue,YU Xue-hui,HUANG Xing-kai,HE Wen-yan.Zircon U-Pb Dating of Several Selected Alkali-rich Porphyries from the Jinshajiang-Ailaoshan Fault Zone and Geological Significance[J].Geoscience——Journal of Graduate School,China University of Geosciences,2011,25(2):189-200. |
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| Authors: | LI Yong MO Xuan-xue YU Xue-hui HUANG Xing-kai HE Wen-yan |
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| Institution: | LI Yong,MO Xuan-xue,YU Xue-hui,HUANG Xing-kai,HE Wen-yan(State Key Laboratory of Geological Processes and Mineral Resources,School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China) |
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| Abstract: | By using LA-ICP-MS zircon U-Pb dating,the ages of four alkali-rich porphyries from the Jinshajiang-Ailaoshan fault zone have been determined.The results show that the age of the Jianchuan hornblende syenite porphyry is(37.6±2.2) Ma,the age of Yaoan biotite hornblende syenite porphyry is(31.8±2.6)Ma and that of Jiudingshan porphyritic biotite adamellite is(37.93±0.82) Ma.There are,however,two ages for Yaoan biotite monzonitic porphyry,(36.86±0.63)Ma and(40.41±0.24)Ma,respectively.The formation ages of these four porphyries are consistent with the peak timing of formation of the Cenozoic alkali-rich prophyries in western Yunnan,and all in the time frame of the post-collision magmatism of the Tibetan Plateau.It is believed that the emplacement of the porphyries was a magmatic response to India-Eurasia collision. |
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| Keywords: | alkali-rich porphyry Jinshajiang-Ailaoshan fault zone LA-ICP-MS zircon U-Pb dating Cenozoic magmatism |
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