| 西昆仑库地煌斑岩的年代学及地球化学特征 |
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| 引用本文： | 周辉,李继亮.西昆仑库地煌斑岩的年代学及地球化学特征[J].岩石学报,2000,16(3):380-384. |
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| 作者姓名： | 周辉 李继亮 |
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| 作者单位： | 1. 北京大学地质学系,北京,100871
2. 中国科学院地质与地球物理研究所,北京,100029 |
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| 基金项目： | 国家 3 0 5项目 (96-915 -0 6-0 3 )，国家自然科学基金 (批准号 :4990 2 0 2 0 )资助项目 |
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| 摘 要： | 在西昆仑库地发现的煌斑岩脉为钙碱性、钾质闪煌岩，侵位在加里东期的变质增生楔杂岩中，采用角闪石单矿物＾４０Ａｒ／＾３９Ａｒ同位素年代学方法确定粕斑岩的侵位年龄为４０４Ｍａ。煌斑岩的稀土元素总量较高，配分图呈轻稀土富集的右倾型式；微量元素以相对富含固离子亲石元素、亏损高场强元素为特征；结合地球化学、同位素特征和大地构造背景分析，煌斑岩来源于受原特提斯俯冲组分释放富含大离子不相容元素流体交代过的亏损地幔
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| 关 键 词： | 青藏高原 西昆仑 煌斑岩 年代学 地球化学特征 |
Age and
geochemical features of lamprophyres in Kuda, western Kunlun |
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| Zhou Hui and Li Jiliang..Age and
geochemical features of lamprophyres in Kuda, western Kunlun[J].Acta Petrologica Sinica,2000,16(3):380-384. |
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| Authors: | Zhou Hui and Li Jiliang |
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| Institution: | Zhou Hui and Li Jiliang. . Department of Geology,Peking University,Beijing,Chin,. Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,China. |
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| Abstract: | The field observation, petrology, geochemical features and age of the lamprophyres in Kuda, western Kunlun are presented in this paper. The lamprophyres occur as dikes emplaced in Caledonian metamorphic accretionary complex with the wall rocks of muscovitequartz schist and felsic gneiss. The emplacement age of lamprophyres is 404Ma determined by hornblende ~(40)Ar/~(39)Ar dating method. The lamprophyres are characteristed as calcalklic kalicamptonite. The total REE and the LREE/HREE ratio of lamprophyres are up to ca. 180 and 3.0, respectively. Also, it is relatively rich in LILE and depleted in HFSE. Based on the analysis of geochemical features, SmNd isotope and tectonic setting, it is concluded that the lamprophyres may occur from depleted mantle wedge which was metasomatosed due to the subduction of ProtoTethys. |
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| Keywords: | Tibet Western Kunlun Lamprophyre Age Geochemical features |
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