| 新疆西天山阿拉套山东部孔吾萨依A型花岗岩成岩年代、地球化学特征及成因 |
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| 引用本文： | 林涛,邓宇峰,陈斌,王志强,孙克克,赵冰冰.新疆西天山阿拉套山东部孔吾萨依A型花岗岩成岩年代、地球化学特征及成因[J].地质学报,2019,93(5):1020-1036. |
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| 作者姓名： | 林涛 邓宇峰 陈斌 王志强 孙克克 赵冰冰 |
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| 作者单位： | 合肥工业大学资源与环境工程学院;安徽省地质矿产局第二水文工程地质勘查院;安徽省矿产资源与矿山环境工程技术研究中心;南方科技大学地球与空间科学系;中国地质大学(北京)地球科学与资源学院 |
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| 基金项目： | 本文为国家自然科学基金项目（编号 41530206, 4153000177，U1803113）和中央高校基本科研业务费专项资金（编号 JZ2018HGTB0246）资助成果。 |
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| 摘 要： | 孔吾萨依花岗岩体位于新疆西天山阿拉套山南坡东侧,岩体主要由碱长花岗岩、粗粒钾长花岗岩、细粒钾长花岗岩组成。碱长花岗岩的~(206)Pb/~(238)U加权平均年龄值为293.1±3.6Ma,细粒钾长花岗岩的年龄为293±3.7Ma。三类花岗岩具相似的地球化学特征,属准铝质—弱过铝质的高钾钙碱性系列花岗岩。从碱长花岗岩到粗粒钾长花岗岩再到细粒钾长花岗岩,其Eu负异常程度越来越高,元素Ba、Sr、P、Ti等的亏损及Rb、Th、U等的富集程度逐步增高,显示三者的岩浆之间具有结晶分异趋势。碱长花岗岩、粗粒钾长花岗岩及细粒钾长花岗岩均富Ga(10~4Ga/Al比值2.6～3.5)、高Fe~*值(=FeO~T/(FeO~T+MgO),0.88～0.97)和具较高的TiO_2/MgO比值(0.51～1.25),显示出典型A型花岗岩的特征。研究区A型花岗岩具有高的锆石饱和温度(853.86～931.56℃)和低的锆石Ce(Ⅳ)/Ce(Ⅲ)比值(1.9～77),暗示该A型花岗岩岩浆形成于高温和低氧逸度条件下。三类花岗岩具较高的Y含量(43.3×10~(-6)～106×10~(-6))、较高的ε_(Nd)(t)(+3.0～+5.2)和较低的(~(87)Sr/~(86)Sr)_i值(0.7027～0.7069),表明孔吾萨依A型花岗岩可能源于玄武质地壳的部分熔融。但与西天山石炭纪玄武岩相比,孔吾萨依花岗岩的ε_(Nd)(t)值较低,而(~(87)Sr/~(86)Sr)_i值较高,因此孔吾萨依花岗岩的岩浆源区应有古老地壳物质的加入。
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| 关 键 词： | 阿拉套山 A型花岗岩 锆石U- Pb年代学 岩石成因 氧逸度 |
| 收稿时间： | 2018/4/23 0:00:00 |
| 修稿时间： | 2018/10/22 0:00:00 |
Geochronology, geochemistry and petrogenesis of the Kongwusayi A- type granites in the eastern Alataw Mountain, West Tianshan, Xinjiang |
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| LIN Tao,DENG Yufeng,CHEN Bin,WANG Zhiqiang,SUN Keke and ZHAO Bingbing.Geochronology, geochemistry and petrogenesis of the Kongwusayi A- type granites in the eastern Alataw Mountain, West Tianshan, Xinjiang[J].Acta Geologica Sinica,2019,93(5):1020-1036. |
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| Authors: | LIN Tao DENG Yufeng CHEN Bin WANG Zhiqiang SUN Keke and ZHAO Bingbing |
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| Institution: | 1) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009;2) The Second Institute of Hydrology and Engineering Geological Prospecting of Anhui Geological Prospecting Bureau, Wuhu, Anhui, 241000,1) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009;3) Anhui Province Engineering Research Center for Mineral Resources and Mine Environments, Hefei, 230009,1) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009;Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, Guangdong, 518055,1) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009;3) Anhui Province Engineering Research Center for Mineral Resources and Mine Environments, Hefei, 230009,School of Earth Scienes and Resources, China University of Geosciences, Beijing, 100083 and 1) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009 |
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| Abstract: | |
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| Keywords: | Alataw Mountain A- type granite U- Pb chronology of zircon petrogenesis oxygen fugacity |
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