氧化物型含铀矿物LA-ICP-MS U-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 U-Pb isotopic dating and their correction methods
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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。
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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
Abstract: 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. -
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