| 内蒙古西部额济纳旗及邻区上石炭统—下二叠统阿木山组火山岩的地球化学特征 |
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| 引用本文： | 姜 亭,李玉宏,陈高潮,魏建设,李金超.内蒙古西部额济纳旗及邻区上石炭统—下二叠统阿木山组火山岩的地球化学特征[J].地质通报,2011,30(6):932-942. |
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| 作者姓名： | 姜 亭 李玉宏 陈高潮 魏建设 李金超 |
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| 作者单位： | 中国地质调查局西安地质调查中心,陕西西安,710054 |
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| 基金项目： | 中国地质调查局国土资源大调查项目 |
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| 摘 要： | 分析了上石炭统小独山阶—下二叠统紫松阶阿木山组玄武岩地球化学特征，对玄武岩类型、岩石特征、构造环境等进行了探讨，结合前人的研究成果，阐述了石炭纪—二叠纪盆地的基本性质。Zr/TiO2-Nb/Y、SiO2-TFeO/MgO和Zr-Y-Nb图解显示，玄武岩类型主要为亚碱性的拉斑玄武岩；稀土元素球粒陨石配分模式为右倾曲线，(La/Yb）N值较高，轻重稀土元素分馏较强，(Gd/Lu）N值相对较低，重稀土元素分馏较弱，δEu在0.87~1.11之间，无明显Eu异常；N-MORB标准化的微量元素蛛网图显示，K2O、Rb、Ba、Th等不相容元素富集，Hf、Nb、Y等亏损。Zr-Zr/Y和Ta/Hf-Th/Hf构造环境图解表明，该玄武岩产于陆内裂谷，指示晚石炭世—早二叠世额济纳旗及其邻区已进入了陆内演化阶段，为拉张作用下的陆内裂谷（裂陷）盆地。
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| 关 键 词： | 额济纳旗及其邻区 上石炭统小独山阶—下二叠统紫松阶 火山岩地球化学特征 裂谷盆地 |
Geochemical characteristics of Carboniferous-Permian Amushan Formation volcanic rocks in Ejin Banner and its vicinities, western Inner Mongolia |
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| JIANG Ting,LI Yu-hong,CHEN Gao-chao,WEI Jian-she,LI Jin-chao.Geochemical characteristics of Carboniferous-Permian Amushan Formation volcanic rocks in Ejin Banner and its vicinities, western Inner Mongolia[J].Geologcal Bulletin OF China,2011,30(6):932-942. |
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| Authors: | JIANG Ting LI Yu-hong CHEN Gao-chao WEI Jian-she LI Jin-chao |
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| Abstract: | Based on an analysis of basalt geochemical characteristics of Amushan Formation(western Ganquan Formation) of Upper Carboniferous Xiaodushan Stage-Lower Permian Zisong Stage and the basalt type,this paper deals with the rock characteristics and tectonic environment.Previous studies have already revealed the basic type of Carboniferous-Permian basin.The Zr/TiO2-Nb/Y,SiO2-TFeO/MgO and Zr-Y-Nb diagrams show that the basalt in Ejin Banner and its vicinities is mainly of the sub-alkaline tholeiite series.Chondri... |
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| Keywords: | Ejin Banner and its vicinities Upper Carboniferous-Lower Permian geochemical characteristics of volcanic rocks rift basin |
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