| 滇西梁河地区钾长花岗岩锆石LA-ICP-MS U-Pb定年及其地质意义 |
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| 引用本文： | 谢韬,林仕良,丛峰,李再会,邹光富,李军敏,梁婷.滇西梁河地区钾长花岗岩锆石LA-ICP-MS U-Pb定年及其地质意义[J].大地构造与成矿学,2010,34(3). |
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| 作者姓名： | 谢韬 林仕良 丛峰 李再会 邹光富 李军敏 梁婷 |
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| 作者单位： | 中国地质调查局,成都地质调查中心,四川,成都,610082;中国地质大学(武汉)地质过程与矿产资源国家重点实验室,湖北,武汉,430074 |
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| 基金项目： | 云南1:5万梁河县、江东、帕底幅区域地质调查项目( |
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| 摘 要： | 在详细区域地质调查的基础上,对滇西梁河地区具有代表性的两件钾长花岗岩样品中的锆石进行了阴极发光图像、微区原位LA-ICP-MS微量元素分析和U-Pb定年。结果表明,梁河地区钾长花岗岩锆石显示振荡环带的内部结构,指示其岩浆成因;两件样品的锆石具有较高的Th、U含量,稀土元素总量较高,轻稀土亏损、重稀土富集,明显的的Ce正异常和Eu负异常的稀土配分模式,说明其壳源岩浆锆石特征;两件样品的锆石206Pb/238U加权平均年龄分别是(60.7±0.6)Ma和(115.8±1.0)Ma,属古新世和早白垩世花岗岩。结合区域地质特征,腾冲地块在中生代晚期-新生代早期发生多期岩浆作用,揭示滇西三江地区特提斯演化的岩浆响应,为青藏高原东缘地区地质演化的动力过程提供约束。
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| 关 键 词： | 滇西 梁河 钾长花岗岩 锆石U-Pb年龄 |
LA-ICP-MS Zircon U-Pb Dating for K-feldspar Granites in Lianghe Region, Western Yunnan and Its Geological Significance |
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| XIE Tao,LIN Shiliang,CONG Feng,LI Zaihui,ZOU Guangfu,LI Junmin,LIANG Ting.LA-ICP-MS Zircon U-Pb Dating for K-feldspar Granites in Lianghe Region, Western Yunnan and Its Geological Significance[J].Geotectonica et Metallogenia,2010,34(3). |
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| Authors: | XIE Tao LIN Shiliang CONG Feng LI Zaihui ZOU Guangfu LI Junmin LIANG Ting |
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| Institution: | XIE Tao1,LIN Shiliang1,CONG Feng1,LI Zaihui1,ZOU Guangfu1,LI Junmin1 and LIANG Ting2(1.Chengdu Center,China Geological Survey,Chengdu 610081,Sichuan,China,2.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,Hubei,China) |
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| Abstract: | CL imaging,LA-ICP-MS U-Pb dating and trace element analysis were carried out for the zircons from two representative K-feldspar granites in the Lianghe region,western Yunnan.The results show that the zircons display oscillatory zoning which suggests a magmatic origin.Zircons from two samples show similar REE patterns,which are high in Th,U,and REE,relative enrichment of HREE,and significant Ce positive anomalies and Eu negative anomalies.These are the characteristics of magmatic zircon of crustal origin.The... |
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| Keywords: | western Yunnan Lianghe K-feldspar granite zircon U-Pb age |
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