南极格罗夫山铁陨石的微量元素特征及类型划分  

Trace Element Characteristics and Classification of Iron Meteorites from the Grove Mountains,Antarctica

作　　者：邵慧敏 缪秉魁 黄丽霖[1,2] 夏志鹏 SHAO Hui-min;MIAO Bing-kui;HUANG Li-lin;XIA Zhi-peng(Guangxi Academician Workstation for Cosmochemistry and Planetary Science,Guilin 541004,China;Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]广西天体化学与行星科学院士工作站,桂林541004 [2]桂林理工大学,广西隐伏金属矿产勘查重点实验室,桂林541004

出　　处：《矿物岩石地球化学通报》2020年第1期125-132,共8页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金项目(41776196,41173077);国家科技基础条件平台项目(2005DKA21406)。

摘　　要：微量元素特征是划分铁陨石类型的重要指标,对铁陨石成因具有重要的指示意义。本文在GRV090018、GRV090327和GRV090333三块南极格罗夫山铁陨石岩矿分析的基础上,采用ICP-MS和ICP-OES方法对其进行全岩主、微量元素含量分析。结果表明,GRV090018、GRV090327和GRV090333分别为未分群、IAB-un型和IAB-sLM型铁陨石。GRV090018具有高Ir和Se、低Ga和Ge特征;GRV090327较IAB群具有相似的Ga-Ni、Ge-Ni关系,Ir含量较低;GRV090333较IAB-sLM亚群具有相似的Ga-Ni、Ge-Ni和Ir-Ni关系,Cr和Mn含量较低,W含量较高。此外,GRV090327与GRV090333的冷却速率约为1~10℃/Ma,前者稍快于后者。Trace element compositions of iron meteorites are important indicators for the classification and origin of iron meteorites.Based on the observation and analyses on their mineralogy and petrology,the main and trace element compositions of the GRV090018,GRV090327 and GRV090333 meteorites are measured by using the ICP-MS and ICP-OES methods.The results show that GRV090327,GRV090333 and GRV090018 are IAB-un,IAB-sLM and ungrouped iron meteorites respectively.GRV090018 has high Ir and Se contents,low Ga and Ge contents;GRV090327 has similar Ga-Ni and Ge-Ni relationships to the IAB group,with its relatively low Ir content;GRV090333 has similar Ga-Ni,Ge-Ni and Ir-Ni relationships to the IAB-sLM subgroup,with relatively low Cr and Mn contents and high W content.In addition,the cooling rates of GRV090327 and GRV090333 are approximately 1-10℃/Ma and the cooling rate of GRV090327 is slightly faster than that of GRV090333.

关 键 词：铁陨石 微量元素 类型划分 冷却速率 成因 

分 类 号：P148[天文地球—天体物理]