锆石激光原位微区U-Th-Pb-He双定年分析方法进展  

review on the zircon laser in-situ microanalytical U-Th-Pb-He double dating

作　　者：刘文博 陶霓 孙敬博[3] 温汉捷 LIU Wen-bo;TAO Ni;SUN Jing-bo;WEN Han-jie(School of Earth Science and Resources,Chang′an University,Xi′an 710054,China;Engineering Technology Innovation Center of New Energy Minerals and Resource Information,Ministry of Natural Resources,Xi’an 710054,China;Laboratory of Isotope Thermochronology,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]长安大学地球科学与资源学院,西安710054 [2]自然资源部新能源矿产与资源信息工程技术创新中心,西安710054 [3]中国地质科学院地质研究所同位素热年代学实验室,北京100037

出　　处：《矿物岩石地球化学通报》2025年第1期162-177,共16页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(41703055,42073054,42127801);中央高校基本科研业务费专项项目(300102272207);中国地质科学院地质研究所基本科研业务费项目(J2311)。

摘　　要：锆石激光原位微区U-Th-Pb-He双定年方法是一项结合锆石激光原位微区(U-Th)/He和U-Pb定年技术的前沿方法,该方法能够实现同时在锆石矿物微区上获得(U-Th)/He和U-Pb两种同位素体系年龄数据。U-Th-Pb-He双定年技术不仅显著提高了(U-Th)/He定年的分析效率,而且使得(U-Th)/He和U-Pb两种年龄数据更为紧密地耦合起来,从而揭示矿物及其赋存岩石地层丰富的热演化历史,增强了这两种同位素年代学体系年龄数据解释的有效性与可靠性。本文系统梳理了锆石激光原位微区U-Th-Pb-He双定年方法的发展历程与现状,收集了已发表的相关标准样品与自然样品数据,并尝试分析已有测试数据中可能存在的技术难点与挑战。目前,U-Th-Pb-He双定年方法及其技术流程已能提供一定精准度与空间分辨率的同位素和年龄数据,尽管仍然存在着一些技术困难,包括^(4)He含量的精准测量、U-Th微区不均一和含U-Th显微包裹体对U-Th同位素含量定量分析的影响等,已有相应的解决方法。国内外相关实验室针对U-Th-Pb-He双定年方法的上述技术问题正在持续开展深入的理论与实验研究,相关进展有望促进锆石U-Th-Pb-He双定年分析数据精准度、可靠性与可解释性,为地球科学相关领域的研究提供更为准确可靠的技术支撑。The zircon laser in-situ microanalytical U-Th-Pb-He double dating method is an innovative frontier method combined with zircon laser in-situ(U-Th)/He and U-Pb dating techniques.It can be used to simultaneously obtain the in-situ dating data of both the(U-Th)/He and U-Pb two isotopic systems from microanalytical spots of zircons.This technique not only obviously improves the(U-Th)/He dating analytical efficiency,but also offers a better coupling of two chronological datasets of the(U-Th)/He and U-Pb isotopic systems.Thus,more plenty thermal evolution histories of minerals and their hosting rocks and strata can be revealed,the efficiency and reliability of interpretations for dating data of these two isotopic systems can be enhanced.In this paper,the development process and current status of the zircon laser in-situ microanalytical U-Th-Pb-He double dating method have been systematically reviewed,the published results of both standards and natural samples have been collected,and the possible associated technical difficulties and challenges in the existed test data have been attemptly analyzed.It also conducts in-depth analysis and discussion on the current difficulties and challenges. Up to now, the isotopic dating data with a certain precision and spatialresolution are capably provided by application of the zircon laser in-situ microanalytical U-Th-Pb-He double dating method and itstechnical process. Although there are still some technical difficulties and challenges, including precise measurement of ^(4)He content,the influences of U-Th micro-heterogeneity and/or U-Th-bearing micro-inclusions of zircons on the quantitative analysis of contentsof U-Th isotopes, some relevant solutions are provided. The in-depth theoretical and experimental researches on the abovementionedtechnical difficulties of the zircon laser in-situ microanalytical U-Th-Pb-He double dating method are being actively andcontinuously carried out by researchers in aboratories at home and abroad. It is expected that some relevant research progress

关 键 词：(U-Th)/He U-PB 双定年 锆石 激光原位微区 

分 类 号：P597[天文地球—地球化学]