| 铂族元素地球化学研究评述 |
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| 引用本文： | 许成,黄智龙,刘丛强,翟世奎,李文博,管涛.铂族元素地球化学研究评述[J].地学前缘,2003,10(4):520-528. |
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| 作者姓名： | 许成 黄智龙 刘丛强 翟世奎 李文博 管涛 |
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| 作者单位： | 1. 中国科学院,地球化学研究所,矿床地球化学开放研究实验室,贵州,贵阳,550002
2. 中国海洋大学,海洋地球科学学院,山东,青岛,266003 |
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| 基金项目： | 国家重点基础研究发展规划项目(G1999043203)，国家攀登计划预选资助项目(95-预-39) |
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| 摘 要： | 随着分析技术的发展和数据的积累,人们逐渐认识到PGE在地球化学研究方面具有潜在的应用价值。但地幔中PGE的存在形式目前尚不清楚,在许多方面还有争议。文中通过大量的实例综述了近年来PGE的分异机制和其在上地幔分布不均一性方面取得的进展以及存在的问题,结果表明:除Au外,蚀变作用并不影响PGE的分异;PGE主要以硫化物或合金的形式赋存于地幔岩石中,其分布不均匀,单一地依靠PGE与MgO,Cr,Ni的相关性来探讨部分熔融、分离结晶过程中橄榄石、尖晶石、铬铁矿对PGE分异的影响是不全面的,必须考虑硫化物的作用;地幔岩石具有包裹体和粒间两种不同PGE分配模式的硫化物。地幔源区或板内携带PGE流体交代以粒间硫化物为主的地幔岩石。使其PGE发生分异;不管是核幔分离后外核物质的返回,还是单一硫化物的作用都不能完全否定陨石撞击的地球增生假说。在大的区域,上地幔PGE的分布是均一的,但在一定范围内由于不同的大地构造背景,其PGE的分布显示不均一性。
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| 关 键 词： | 铂族元素(PGE) 地球化学 分异机制 PGE分布不均一性 |
| 文章编号： | 1005-2321(2003)04-0520-09 |
| 修稿时间： | 2002年9月23日 |
REVIEW ON GEOCHEMISTRY OF PLATINUM-GROUP ELEMENTS |
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| XU Cheng,HUANG Zhi-long,LIU Cong-qiang,ZHAI Shi-kui,LI Wen-bo,GUAN Tao Open Laboratory of Ore Deposit Geochemistry.REVIEW ON GEOCHEMISTRY OF PLATINUM-GROUP ELEMENTS[J].Earth Science Frontiers,2003,10(4):520-528. |
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| Authors: | XU Cheng HUANG Zhi-long LIU Cong-qiang ZHAI Shi-kui LI Wen-bo GUAN Tao Open Laboratory of Ore Deposit Geochemistry |
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| Institution: | XU Cheng,HUANG Zhi-long,LIU Cong-qiang,ZHAI Shi-kui,LI Wen-bo,GUAN Tao Open Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy
of Sciences,Guiyang 550002,China, College of Marine Geosciences,Ocean University of China,Qingdao 266003,China |
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| Abstract: | With the development of analytical methods and accumulation of analytical data, the potential value of the application of platinum-group elements (PGE) in geochemistry has been gradually recognized. However, it is unknown about the existence form of PGE in the mantle. Based on the previous studies, we have reviewed the research results of PGE fractionation mechanism and inhomogeneous distribution in the upper mantle. It shows that (1) except for Au, the alteration does not affect the PGE fractionation; (2) the host mantle-derived rocks for PGE are mainly sulfides or alloys, in which the PGE are not evenly distributed; so it is insufficient to solely consider the correlation coefficient of PGE with MgO, Cr and Ni and only discuss the olivine, spinel and chromite contribution to PGE fractionation during partial melting and fractional crystallization; the sulfides should be considered; (3) sulfide inclusions and interstitial sulfides concentrated in mantle-derived rocks show different PGE distribution patterns; mantle- or slab-derived fluids carrying PGE metasomatized interstitial sulfides in mantle-derived rocks, which led to PGE fractionation in mantle-derived rocks; (4) the addition of core material and sulfide collections alone cannot totally deny the "late veneer" hypothesis during the earth accretion. So the distribution of PGE in the mantle is characterized by large-scale homogeneity and small-scale heterogeneity. |
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| Keywords: | platinum-group elements (PGE) geochemistry fractionation mechanism inhomogeneous distribution of PGE |
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