| 西藏班戈地区青龙花岗闪长岩SHRIMP锆石U-Pb年龄及其地球化学特征 |
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| 引用本文： | 黄瀚霄,李光明,董随亮,刘波,张晖,张丽,李应栩,石洪召.西藏班戈地区青龙花岗闪长岩SHRIMP锆石U-Pb年龄及其地球化学特征[J].中国区域地质,2012(6):852-859. |
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| 作者姓名： | 黄瀚霄 李光明 董随亮 刘波 张晖 张丽 李应栩 石洪召 |
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| 作者单位： | [1]中国地质调查局成都地质矿产研究所,四川成都610081 [2]北京科技大学,北京100083 |
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| 基金项目： | 国家重点基础发展计划项目《青藏高原南部大陆聚合与成矿作用》（编号：2011CB403100）; 中国地质调查局地质矿产调查评价专项《西藏铜铅锌国家级接替基地综合研究》（编号：1212011121239）、《西藏大型矿床成矿专属性研究》（编号：1212011221073）
致谢：在成文过程中得到成都地质矿产研究所雍永源研究员、袁四化博士的支持和指导,在此表示感谢. |
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| 摘 要： | 青龙岩体位于冈底斯带北麓,是班戈-嘉黎岩浆岩带的重要组成部分。该岩体主要岩性为花岗闪长岩,形成于白垩纪早期,SHRIMP锆石U-Pb 206Pb/238U年龄加权平均值为123.1Ma±3.4Ma,该年龄反映了青龙花岗闪长岩体的侵位或结晶年龄。花岗闪长岩地球化学数据表明,该岩体具有正常的SiO2含量,较低的K2O/Na2O比值,为弱过铝质岩石。该岩体轻稀土元素较重稀土元素富集,负Eu异常较弱。在微量元素蛛网图上,该岩体表现出强烈的Nb、Ta、Ti、Y负异常,具有岛弧花岗岩的地球化学特征。通过初步研究,认为青龙花岗闪长岩形成于俯冲背景,为与板片俯冲作用有关的同熔型花岗岩。
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| 关 键 词： | 冈底斯 西藏班戈地区 SHRIMP锆石U-Pb定年 |
SHRIMP zircon U-Pb age and geochemical characteristics of Qinglung granodiorite in Baingoin area,Tibet |
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| HUANG Han-xiao,LI Guang-ming,DONG Sui-liang,LIU Bo,ZHANG Hui,ZHANG Li,LI Ying-xu,SHI Hong-zhao.SHRIMP zircon U-Pb age and geochemical characteristics of Qinglung granodiorite in Baingoin area,Tibet[J].Regional Geology of China,2012(6):852-859. |
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| Authors: | HUANG Han-xiao LI Guang-ming DONG Sui-liang LIU Bo ZHANG Hui ZHANG Li LI Ying-xu SHI Hong-zhao |
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| Institution: | 1.Chengdu Institute of Geology and Mineral Resources,China Geological Survey,Chengdu 610081,Sichuan,China; 2.University of Science and Technology of Beijing,Beijing 100083,China |
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| Abstract: | Located in the middle of Baingoin-Nujiang suture zone,the Qinglung rock mass is an important component part of the Baingoin-Lhari magmatic zone.The rock mass is composed mainly of granodiorite formed in Early Cretaceous.Zircon SHRIMP UPb age is 123.1±3.4 Ma,which reflects the age of pluton emplacement or crystallization.Geochemical data indicate that the rock mass has high SiO2 content and relatively low K2O/Na2O ratios,belonging to weakly peraluminous rocks.Qinglung rock mass is enriched in HREE and depleted in LREE,with relatively weak negative Eu anomaly.In the trace element spider diagram,granodiorite shows strong negative Nb,Ta,Ti and Y anomalies,similar to the island arc granite in geochemical characteristics.The tectonic setting of Qinglung rock mass was a subduction environment,mainly formed by the melting of the subduction slab. |
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| Keywords: | Gangdise Baingoin area of Tibet SHRIMP zircon U-Pb dating |
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