| 北祁连水洞峡蛇绿岩地球化学特征及构造环境 |
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| 引用本文： | 黄增保,张有奎,吕菊蕊,李葆华,刘明强.北祁连水洞峡蛇绿岩地球化学特征及构造环境[J].甘肃地质学报,2010,19(2):1-7. |
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| 作者姓名： | 黄增保 张有奎 吕菊蕊 李葆华 刘明强 |
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| 作者单位： | [1]成都理工大学地球科学学院,四川成都610059 [2]甘肃省地质调查院,甘肃兰州730000 |
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| 基金项目： | 本文为甘肃1：25万武威幅区域地质调查（项目编号1212010510407）的部分成果. |
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| 摘 要： | 水洞峡蛇绿岩主要由辉石岩、辉长岩和玄武岩组成。玄武岩的Sm-Nd年龄值为492.9±22.6Ma,表明为早奥陶世岩浆产物。玄武岩具有较高的SiO2和TiO2含量,LREE富集,基本无铕异常,具有较低的Th/Ta比值,和较高的Ta/Hf的值,主要地球化学特征与WPB相似,与OIB有区别,在构造环境判别图解中,玄武岩均投入WPB区域。根据上述特征并结合区域地质构造特征,认为可能形成于板内拉张环境。
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| 关 键 词： | 蛇绿岩 地球化学 构造环境 水洞峡 |
Geochemical Features and Tectonic Setting of Shuidongxia Ophiolite in North Qilian |
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| HUANG Zeng-bao,ZHANG You-kui,LU Ju-rui,LI Bao-hua and LIU Ming-qiang.Geochemical Features and Tectonic Setting of Shuidongxia Ophiolite in North Qilian[J].Acta Geologica Gansu,2010,19(2):1-7. |
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| Authors: | HUANG Zeng-bao ZHANG You-kui LU Ju-rui LI Bao-hua and LIU Ming-qiang |
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| Institution: | 1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China; 2.Geological Survey of Gansu Province ,Lanzhou 735000, China) |
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| Abstract: | The Shuidongxia Ophiolite is mainly composed of peridotite gabbro and basalt. Sm-Nd age of the basalt is 492.9 ±22.6Ma indicating it is product of early Ordovician magmatic activity. The basalt show highter SiO2 and TiO2 contents,and The light REE enriched, essentially no Eu anomaly. In the incompatible elements.the basalt have low Th/Ta ratios.higher Ta/Hf ratios These geochemical characteristics of the basahs are similar to the WPB, but evidently differently from OIB. On the identification diagram of setting, the basahs are all ploted in the area of WPB. According to the regional geological characteristics and geochemistry, the ophiolite be formed with plate tholeiites. |
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| Keywords: | ophiolite geochemistry tectonic setting Shuidongxia |
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