氧化物型含铀矿物LA-ICP-MSU-Pb年龄测定中的基体效应及其校正方法  

The matrix effects in oxide-type U-bearing mineral LA-ICP-MS UPb isotopic dating and their correction methods

作　　者：崔玉荣[1] 周红英[1] 耿建珍[1] 李国占[1] 郝爽[1] 李惠民[1] 

机构地区：[1]中国地质调查局天津地质矿产研究所,天津300170

出　　处：《地质通报》2015年第12期2325-2333,共9页Geological Bulletin of China

基　　金：国家自然科学基金项目(批准号:41503052;41373053);北京离子探针中心开放课题基金项目(编号:DDK14-39);东华理工大学核资源与环境重点实验室开放基金项目(编号:NRE1401);国土资源部公益性行业科研专项项目(编号:201011027-4)

摘　　要：基体效应是矿物微区原位LA-ICP-MS U-Pb测年中备受关注的问题,因为其对测年结果准确性的影响不容忽视。通过介绍斜锆石、金红石、锡石、铌铁矿、晶质铀矿、沥青铀矿等氧化物型含铀矿物微区原位LA-ICP-MS U-Pb同位素测年过程中基体效应的影响和校正方法,简要评述其校正方法的优点、局限性,探索规律和相似性,解决寻找和研制稀有矿物标样的难题。对含铀矿物进行准确的微区原位LA-ICP-MS U-Pb同位素年龄测定,对于全面认识众多地质事件和矿床的生成演化历史,进而更准确地构建其年代构造格架、建立更合理的成岩成矿模式具有重要的科学意义。The matrix effect is a problem of much concern in U-Pb isotopic dating by in situ LA-ICP-MS,and its influence on the accuracy of the dating results should not be ignored. The authors intend to study the influences and correction methods of matrix effects on U-Pb isotopic dating by in-situ LA-ICP-MS for such minerals as baddeleyite, rutile, cassiterite, columbite, uraninite, pitchblende and other oxide-type U-bearing minerals. This paper briefly describes the advantages and limitations of these correction methods in the hope of finding some regularity and similarity and solving difficult points in rare minerals standards preparation. In the accurate U-Pb isotopic dating by in situ LA-ICP-MS, the correction methods are of important scientific significance for further comprehensive understanding of the relevant geological generation and evolution history of the deposit, establishment of more accurate structural framework and creation of new petrogenic and metallogenic model.

关 键 词：氧化物型含铀矿物 基体效应 LA-ICP-MS U-Pb同位素测年 

分 类 号：P597.3[天文地球—地球化学]