| 峨眉山大火成岩省太和花岗岩的成因及构造意义 |
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| 引用本文： | 钟宏,徐桂文,朱维光,胡瑞忠,何德锋.峨眉山大火成岩省太和花岗岩的成因及构造意义[J].矿物岩石地球化学通报,2009,28(2):99-110. |
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| 作者姓名： | 钟宏 徐桂文 朱维光 胡瑞忠 何德锋 |
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| 作者单位： | 1. 矿床地球化学国家重点实验室,中国科学院,地球化学研究所,贵阳,550002
2. 矿床地球化学国家重点实验室,中国科学院,地球化学研究所,贵阳,550002;中国科学院,研究生院,北京,100049 |
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| 基金项目： | 国家重点基础研究发展规划(973计划)，国家自然科学基金 |
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| 摘 要： | 攀西地区的太和花岗质岩体和赋存超大型钒钛磁铁矿矿床的辉长岩体在空间上共生,成因上均与峨眉山地幔柱头的上升密切相关.太和花岗质岩体主要由超碱质花岗岩和石英正长岩及少量正长岩组成;富含高场强元素并具高Ga/Al值(3.74～5.63),显示典型A型花岗岩的特征.花岗岩、正长岩和辉长岩的Nb/Ta和Zr/Hf值与洋岛玄武岩(OIB)的相应比值近似.花岗质岩石具较低的87Sr/86Sr初始值(0.7025～0.7049)和正的εNd(t)值(1.9～3.5),与辉长岩的值相近(87Sr/86Sr)i =0.7049～0.7052; εNd(t) =2.4～3.3].太和花岗质岩体的εNd(t)为正值,显示地幔柱来源的底侵玄武质岩浆对其形成起主要作用.辉长质和花岗质岩石具相似的钕同位素组成,表明其母岩浆来自于同一源区.我们认为太和花岗质侵入体主要由底侵于下地壳的玄武质岩浆分异出的花岗质熔体侵位及随后经结晶分异而形成.因此,晚古生代时幔源岩浆底侵造成的地壳增生在峨眉山大火成岩省中表现极为显著.
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| 关 键 词： | A型花岗岩 Sr-Nd同位素 岩石成因 峨眉山大火成岩省 |
Petrogenesis of the Taihe Granites in the Emeishan Large Igneous Province and Its Tectonic Implications |
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| ZHONG Hong,XU Gui-wen,ZHU Wei-guang,HU Rui-zhong,HE De-feng.Petrogenesis of the Taihe Granites in the Emeishan Large Igneous Province and Its Tectonic Implications[J].Bulletin of Mineralogy Petrology and Geochemistry,2009,28(2):99-110. |
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| Authors: | ZHONG Hong XU Gui-wen ZHU Wei-guang HU Rui-zhong HE De-feng |
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| Institution: | ZHONG Hong1,XU Gui-wen1,2,ZHU Wei-guang1,HU Rui-zhong1,HE De-feng1,21.State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China,2.Graduate School of Chinese Academy of Sciences,Beijing 100049 |
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| Abstract: | The late Permian Taihe granitic stock in the Pan-Xi area,SW China,showing spatial association with the giant Fe-Ti-V deposit-bearing gabbroic intrusion,is genetically related to the upwelling Emeishan plume head.This granitic intrusion consists mainly of peralkaline alkali-feldspar granite and quartz syenite with subordinate syenite.These granitic rocks have a distinctive A-type chemistry characterized by elevated high-field-strength elements(HFSE) contents and high Ga/Al ratios(3.74 to 5.63).Nb/Ta and Zr/H... |
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| Keywords: | A-type granite Sr-Nd isotope petrogenesis Emeishan large igneous province |
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