| 西天山阿吾拉勒西段群吉萨依花岗斑岩地球化学特征及其成因 |
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| 引用本文： | 闫永红,薛春纪,张招崇,丁振信,杨伟海,韩宗华.西天山阿吾拉勒西段群吉萨依花岗斑岩地球化学特征及其成因[J].岩石矿物学杂志,2013,32(2):139-153. |
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| 作者姓名： | 闫永红 薛春纪 张招崇 丁振信 杨伟海 韩宗华 |
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| 作者单位： | 1. 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
2. 新疆维吾尔自治区有色地质勘查局七零三队,新疆伊犁,835000 |
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| 基金项目： | "十二五"国家科技支撑计划资助项目，中国地质调查局工作项目 |
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| 摘 要： | 西天山阿吾拉勒西段群吉萨依花岗斑岩侵入于群吉萨依背斜北西侧伏端下二叠统乌朗组火山岩中,具似斑状结构,斑晶为斜长石、钾长石、角闪石、黑云母,基质具花岗质半自形微晶粒状结构,主要由斜长石、钾长石、石英等组成.群吉萨依花岗斑岩具有高SiO2 (71.17％ ～72.59％)、富Na2O(8.86％～9.39％)、贫K2O(0.07％～0.28％)的特点,铝饱和指数(A/CNK)为0.87～0.92,A/NK为0.97～1.01,富集Th、U和Pb,亏损Nb、Ta、sr、P、Ti,相对于Th和U亏损Rb、Ba和K等,属过碱质-弱准铝质的分异Ⅰ型花岗岩类.锆石SHRIMP U-Pb法测得花岗斑岩成岩年龄302±4Ma,即形成于石炭纪末—二叠纪初.岩石具有低的Isr(0.70512～ 0.70536)和正的εNd(t)值(+2.1～+2.7),样品的fSm/Nd值为-0.43～-0.56,单阶段模式年龄tDM为713～863 Ma,和该区早石炭世分布的玄武质岩石具有相似的Sr-Nd同位素特征.结合区域构造背景,推测该岩体形成于后碰撞伸展阶段,是由底侵的玄武质岩石在角闪石-石榴石相的条件下发生部分熔融形成的.
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| 关 键 词： | 花岗斑岩 岩石学 Ⅰ型花岗岩 U-Pb测年 岩石成因 |
| 收稿时间： | 2012/10/21 0:00:00 |
| 修稿时间： | 2012/12/12 0:00:00 |
Geochemistry and genesis of the Qunjisayi granite porphyry in the west of Awulale area, Western Tianshan Mountains |
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| YAN Yong-hong,XUE Chun-ji,ZHANG Zhao-chong,DING Zhen-xin,YANG Wei-hai and HAN Zong-hua.Geochemistry and genesis of the Qunjisayi granite porphyry in the west of Awulale area, Western Tianshan Mountains[J].Acta Petrologica Et Mineralogica,2013,32(2):139-153. |
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| Authors: | YAN Yong-hong XUE Chun-ji ZHANG Zhao-chong DING Zhen-xin YANG Wei-hai and HAN Zong-hua |
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| Institution: | State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;No. 703 Geological Party, Xinjiang Geoexploration Bureau for Nonferrous Metals, Yili 835000, China;No. 703 Geological Party, Xinjiang Geoexploration Bureau for Nonferrous Metals, Yili 835000, China |
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| Abstract: | |
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| Keywords: | porphyry granite petrology I-type granite zircon U-Pb age magmatic origin |
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