| 东昆仑祁漫塔格地区晚三叠世正长花岗岩岩石成因及构造意义 |
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| 引用本文： | 张明玉,丰成友,王辉,李大新,瞿泓滢,刘建楠,周建厚. 东昆仑祁漫塔格地区晚三叠世正长花岗岩岩石成因及构造意义[J]. 岩石矿物学杂志, 2018, 37(2): 197-210 |
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| 作者姓名： | 张明玉 丰成友 王辉 李大新 瞿泓滢 刘建楠 周建厚 |
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| 作者单位： | 中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室;长安大学地球科学与资源学院; |
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| 基金项目： | 国土资源部公益性行业科研专项经费项目（201411025）；中国地质调查局地质调查项目（1212011085528）；中国地质调查局高层次地质人才培养计划（201309）；青年地质英才计划（201112） |
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| 摘 要： | 青海省东昆仑祁漫塔格地区肯德可克矿区外围东部发育一正长花岗岩体,主要矿物组合为正长石(50%~60%)+石英(20%~30%)+斜长石(10%~20%)+黑云母(1%~5%)。其LA-ICP-MS锆石U-Pb加权平均年龄为217.9±1.7 Ma(MSWD=0.74,n=20),形成时代为晚三叠世,与祁漫塔格地区铁多金属矿床基本同时形成。岩石地球化学组成具有高硅(Si O2=74.53%~75.28%)、富碱(K2O+Na2O=8.81%~8.95%)、富铁贫镁(Fe OT/Mg O=18.02~31.48)的特征,并具强烈的负Eu异常(δEu=0.04~0.05),富集Rb、Th、U、K、Ga,亏损Sr、Ba、Ta、P、Ti,显示其为准铝质A型花岗岩。正长花岗岩锆石εHf(t)为2.0~12.4,平均6.4,显示其源区具有壳幔混合作用的特征,壳幔物质交换为区内铁多金属矿化提供了大量成矿物质。该正长花岗岩属A2型花岗岩,暗示其形成于造山后的伸展构造体制,反映了祁漫塔格地区晚华力西-印支期造山旋回于晚三叠世由造山后期转为伸展阶段。
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| 关 键 词： | 地球化学 锆石U-Pb年代学 Hf同位素 A型花岗岩 祁漫塔格 |
| 收稿时间： | 2017-02-14 |
Petrogenesis and tectonic implications of the Late Triassic syenogranite in Qimantag area, East Kunlun Mountains |
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| ZHANG Ming-yu,FENG Cheng-you,WANG Hui,LI Da-xin,QU Hong-ying,LIU Jian-nan and ZHOU Jian-hou. Petrogenesis and tectonic implications of the Late Triassic syenogranite in Qimantag area, East Kunlun Mountains[J]. Acta Petrologica Et Mineralogica, 2018, 37(2): 197-210 |
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| Authors: | ZHANG Ming-yu FENG Cheng-you WANG Hui LI Da-xin QU Hong-ying LIU Jian-nan ZHOU Jian-hou |
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| Affiliation: | MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China,MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China,School of Earth Sciences and Resources, Chang''an University, Xi''an 710054, China,MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China,MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China,MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China and MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | |
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| Keywords: | geochemistry zircon U-Pb geochronology Hf isotope A-type granite Qimantag |
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