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| 内蒙古柯单山蛇绿岩地幔橄榄岩铂族元素(PGEs)的分布特征及分异机制探讨 | |
| 引用本文： | 李晖,刘庆,侯泉林,徐辉煌,朱貌贤,曾桂华.内蒙古柯单山蛇绿岩地幔橄榄岩铂族元素(PGEs)的分布特征及分异机制探讨[J].岩石学报,2011,27(6):1759-1769. |
| 作者姓名： | 李晖 刘庆 侯泉林 徐辉煌 朱貌贤 曾桂华 |
| 作者单位： | 1. 中国科学院计算地球动力学重点实验室中国科学院研究生院,北京100049;湖南省地质矿产勘查开发局四一六队,株洲412007 2. 中国科学院计算地球动力学重点实验室中国科学院研究生院,北京,100049 3. 湖南省地质矿产勘查开发局四一六队,株洲,412007 |
| 基金项目： | 本文受中国科学院知识创新工程重要方向项目(XMXX280734)、国家自然科学基金项目(40702009)、中国科学院研究生院院长基金和中国科学院科教结合教育创新项目联合资助. |
| 摘 要： | 采用Carius管结合MC-ICPMS法分析了内蒙古柯单山蛇绿岩地幔橄榄岩中Ir、Ru、 Pt 和Pd 的含量,与典型的地幔橄榄岩进行对比研究,发现柯单山地幔橄榄岩中Ir和Ru明显亏损,Pt和Pd强烈富集,具有极高的Pd/Ir值,PGEs地幔标准化配分模式具有较陡的正斜率,明显不同于通常观测到的代表部分熔融残留相中铂族元素配分模式(负斜率或平坦型)。柯单山地幔橄榄岩的Ir和Ru与MgO呈正相关关系,表明Ir和Ru的亏损可能与部分熔融过程中硫化物的消耗程度有关,而与PGEs在硫化物/硅酸盐间的能斯特分配系数没有直接关系; Pt、Pd的富集表明本区的地幔橄榄岩不仅仅是经历过部分熔融的残余,而与来自深海的橄榄岩和大陆岩石圈地幔(SCLM)中的方辉橄榄岩相似,因此推测,本区地幔橄榄岩在部分熔融后又经历了富Pd的熔/流体交代,而熔/流体的来源可能是在岩浆分异演化过程中"熔离"出来的硫化物。 |
| 关 键 词： | 铂族元素 柯单山蛇绿岩 地幔橄榄岩 部分熔融 熔/流体交代 硫化物 |
| 收稿时间： | 4/9/2010 12:00:00 AM |
| 修稿时间： | 2011/3/12 0:00:00 |
Distribution and fractionation of Platinum-group elements in mantle peridotites from Kedanshan ophiolite,Inner Mongolia |
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| LI Hui,LIU Qing,HOU QuanLin,XU HuiHuang,ZHU MaoXian and ZENG GuiHua.Distribution and fractionation of Platinum-group elements in mantle peridotites from Kedanshan ophiolite,Inner Mongolia[J].Acta Petrologica Sinica,2011,27(6):1759-1769. | |
| Authors: | LI Hui LIU Qing HOU QuanLin XU HuiHuang ZHU MaoXian and ZENG GuiHua |
| Institution: | Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Graduate University of Chinese Academy of Sciences, Beijing 100049, China;416 Geological Prospecting Party of the Bureau of Geology and Mineral Exploration and Development, Hunan Province, Zhuzhou 412007, China;Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Graduate University of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Graduate University of Chinese Academy of Sciences, Beijing 100049, China;416 Geological Prospecting Party of the Bureau of Geology and Mineral Exploration and Development, Hunan Province, Zhuzhou 412007, China;416 Geological Prospecting Party of the Bureau of Geology and Mineral Exploration and Development, Hunan Province, Zhuzhou 412007, China;416 Geological Prospecting Party of the Bureau of Geology and Mineral Exploration and Development, Hunan Province, Zhuzhou 412007, China |
| Abstract: | Platinum-group elements (PGEs) abundances of mantle peridotites from the Kedanshan ophiolite,Inner Mongolia,were determined by using a Carius tube sample digestion and the MC-ICP-MS system.Compared with primitive mantle and typical mantle peridotites in the world,Kedanshan mantle peridotites are enriched in Pt and Pd,but depleted in Ir and Ru,with high Pd/Ir ratio.The PGEs distribution patterns have very steep positive slope,unlike the PGEs distribution patterns in the mantle peridotites of partial melting ... |
| Keywords: | Platinum-group elements (PGEs) Kedanshan ophiolite Mantle peridotite Partial melting Melt percolation Sulfide |
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