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.
作者
邵慧敏
缪秉魁
黄丽霖
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)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
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)。
关键词
铁陨石
微量元素
类型划分
冷却速率
成因
iron meteorite
trace elements
chemical group classification
cooling rate
origin
作者简介
第一作者:邵慧敏(1994-),女,硕士研究生,研究方向:天体化学.E-mail:huimin_shao1994@163.com;通信作者:缪秉魁(1966-),男,教授,研究方向:天体化学.E-mail:miaobk@glut.edu.cn.
