| 阿尔金红柳沟蛇绿岩研究进展 |
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| 引用本文： | 吴峻,李继亮,兰朝利,俞良军.阿尔金红柳沟蛇绿岩研究进展[J].地质科学,2001,36(3):342-349. |
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| 作者姓名： | 吴峻 李继亮 兰朝利 俞良军 |
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| 作者单位： | 中国科学院地质与地球物理研究所岩石圈构造演化开放研究实验室, 北京, 100029 |
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| 基金项目： | 国家“九五”科技攻关“30 5”项目( 96-91 5-0 6-0 3)资助 |
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| 摘 要： | 实测了2条阿尔金地区红柳沟蛇绿混杂带的地质剖面.地球化学的研究发现混杂带中含有2种基性火山岩:MORB型和OIB型,其稀土配分型式分别为平坦型和轻稀土富集型,结合同位素εNd值,推断混杂带中变基性火山岩来自于不同的岩浆源.变质橄榄岩稀土总量低,具有亏损型和平坦型2种不同的稀土配分型式.这种MORB和OIB的组合代表了地幔柱物质与洋壳物质的混合作用.
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| 关 键 词： | 红柳沟蛇绿岩 洋中脊玄武岩 洋岛玄武岩 阿尔金 |
| 收稿时间： | 2000-01-02 |
| 修稿时间： | 2000年1月2日 |
NEW KNOWLEDGES ON HONGLIUGOU OPHIOLITE ALONG ALTUN FAULT, NW CHINA |
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| Wu Jun,Li Jiliang,Lan Chaoli,Yu Liangjun.NEW KNOWLEDGES ON HONGLIUGOU OPHIOLITE ALONG ALTUN FAULT, NW CHINA[J].Chinese Journal of Geology,2001,36(3):342-349. |
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| Authors: | Wu Jun Li Jiliang Lan Chaoli Yu Liangjun |
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| Institution: | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | The Hongliugou ophiolite melange is situated along the Altun fault, NW China. Two detailed profile sections across the melange belt are made. The petrochemical characters of igneous rocks show that there are two types of basalt in the ophiolite melange: MORB and OIB, with REE distribution patterns being flat type and LREE rich type respectively. Combined with the Sm, Nd isotope study, we infer that meta basic rocks in the Hongliugou ophiolite melange were derived from different mantle resoures. The mantle peridotites in Hongliugou ophiolite melange, with low REE abundance, have two types of REE distribution patterns too. All the results above mentioned indicate such an assemblage of MORB and OIB probably the mixed product of mantle plume and ocean crust. |
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| Keywords: | The Hongliugou ophiolite MORB OIB The Altun fault |
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