摘要
LA-ICP-MS碳酸盐矿物U-Pb定年是近年来发展快速的一种定年方法。相比传统的溶液方法,该方法具有快速、经济、分辨率高等特点。碳酸盐矿物具有低U、高普通Pb和元素含量不均一等特点,因此在进行测试前需对样品进行预筛选,选取适宜分析的矿物或区域,以提高分析成功率。激光碳酸盐U-Pb定年方法目前还没有非常完善的标样,因此需要进行非基体匹配校正结合基体匹配的校正策略。目前,该定年方法已经广泛应用于解决脆性变形活动时间、油气成藏时间、沉积作用与成岩作用时限、成矿流体活动时限、洞穴沉积物形成时间和地质热年代学等实际地质问题。未来,新标样的研究和开发、分馏校正方法的统一、与成图成像技术的联用是碳酸盐激光U-Pb定年需要解决的问题和发展方向。
The LA-ICP-MS U-Pb dating of carbonates is a dating method that has been developed at a high speed in recent years. Compared with the traditional solution testing method, it has characteristics of fast speed, economic expenditure, and high resolution. Carbonates have the problems of low U, high common Pb, and heterogeneous elemental contents, so it is necessary to pre-screen the samples and to select suitable carbonate mineral grains or their interested parts for analysis before the laser ablation in order to improve the successive rate of analysis. There is no perfect standard for the laser ablation carbonate U-Pb dating yet, so fractionation correction methods need the combination of non-matrix matched correction and matrix matched correction. At present, this dating method has been widely used to solve various practical geological problems in fields for constraining the brittle deformation activity time, hydrocarbon resources accumulation time, sedimentation and diagenesis time limit, ore-forming hydrothermal fluid activity time, and speleothems formation time, and in the field of geothermal chronology, etc. In the future, the research and development of new standards, the unification of fractionation correction methods, and the combination with imaging/mapping techniques will be important issues and development directions for the in-situ laser ablation carbonate U-Pb dating method.
作者
张亮亮
朱弟成
谢锦程
王青
鲁瑶
徐若炎
齐宁远
ZHANG Liang-liang;ZHU Di-cheng;XIE Jin-cheng;WANG Qing;LU Yao;XU Ruo-yan;QI Ning-yuan(State Key Laboratory of Geological Processes and Mineral Resources,Institute of Earth Sciences,China University of Geosciences(Beijing),Beijing 100083,China;State Key Laboratory of Geological Processes and Mineral Resources,School of Earth Science and Resources,ChinaUniversity of Geosciences(Beijing),Beijing 100083,China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2022年第6期1120-1134,共15页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金资助项目(42121002,41973052,41602059,41772152)
中央高校基本科研业务费资助项目(2652019092)。
