| 地幔中EM1端员成因的锂同位素制约 |
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| 引用本文： | 汤艳杰,张宏福,英基丰.地幔中EM1端员成因的锂同位素制约[J].矿物岩石地球化学通报,2011,30(1):11-17. |
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| 作者姓名： | 汤艳杰 张宏福 英基丰 |
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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演化国家重点实验室,北京,100029 |
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| 基金项目： | 国家自然科学基金资助项目(40773026,90714008) |
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| 摘 要： | 在四个地幔端员(DMM、HIMU、EM1、EM2)中,EM1的成因一直令人困惑。华北克拉通中部(太行山地区)地幔橄榄岩捕虏体的Li同位素组成特征为探讨这一问题提供了新的制约。橄榄岩捕虏体中主要组成矿物(橄榄石、斜方辉石和单斜辉石)的Li同位素组成特征表明,该区的岩石圈地幔中有再循环的、古老的洋壳物质。结合已有的地幔橄榄岩捕虏体的Sr-Nd同位素数据,可以推测再循环的古老蚀变洋壳对地幔EM1端员组分的产生有重要的作用。
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| 关 键 词： | 华北克拉通 地幔端员 橄榄岩捕虏体 锂同位素 地球化学 俯冲洋壳 |
Sr-Nd-Li Isotopic Constraints on the Origin of EM1 End-member |
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| TANG Yan-jie,ZHANG Hong-fu,YING Ji-feng.Sr-Nd-Li Isotopic Constraints on the Origin of EM1 End-member[J].Bulletin of Mineralogy Petrology and Geochemistry,2011,30(1):11-17. |
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| Authors: | TANG Yan-jie ZHANG Hong-fu YING Ji-feng |
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| Institution: | TANG Yan-jie,ZHANG Hong-fu,YING Ji-fengState Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China |
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| Abstract: | The origin of the EM1 end-member in the mantle is a long-standing geochemical puzzle among the four typical mantle end-members(DMM,HIMU,EM1 and EM2).The characteristics of Strontium(Sr),Neodymium(Nd) and Lithium(Li) isotopic compositions in the mantle peridotite xenoliths hosted in the Cenozoic basalts from Hannuoba,Yangyuan,Fanshi and Hebi localities in the Central Zone of the North China Craton,one of the oldest continents in the world,provide new constraints on this issue.Extreme fractionation of Li isot... |
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| Keywords: | North China Craton mantle end-member peridotite xenolith Lithium isotope geochemistry subducted oceanic crust |
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