锆石辐射损伤测年方法研究进展与应用  

Research progress and application of zircon radiation damage dating

作　　者：范明璞 柳小明[1] 孙圣思[1] FAN Mingpu;LIU Xiaoming;SUN Shengsi(State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an,710069)

机构地区：[1]大陆动力学国家重点实验室,西北大学地质学系,西安710069

出　　处：《地质论评》2023年第1期339-356,共18页Geological Review

基　　金：国家自然科学基金资助项目(编号:41873061,42022016);陕西高校青年创新团队项目的成果。

摘　　要：锆石辐射损伤测年是一种新兴的低温热年代学方法(封闭温度为~230±25℃),其原理是依据拉曼半高宽(ν3)计算出锆石所累积的α通量,结合U、Th含量,得出锆石辐射损伤的累积时间,即锆石辐射损伤年龄。相较于其他低温年代学方法,锆石辐射损伤测年具有测试简便、高效、低成本、双(多)定年等优势,在地学研究中展现出广泛的应用前景,现已成功应用于示踪物源区和揭示岩体热事件等领域。然而,该方法尚存几个关键问题有待解决,例如,微区测试的空间不匹配性、封闭温度存有争议、较大的年龄偏差等,这无疑阻碍其在地球科学领域中更进一步的推广和应用。本文系统地介绍了锆石辐射损伤测年方法的起源、原理和测试方法,总结了相关应用的重要进展,阐述了锆石辐射损伤测年方法的尚存问题,并对该方法的发展趋势作以展望,以期为年代学的发展提供新的技术手段。Zircon radiation damage dating is a new low-temperature thermochronology method(a closure temperature of ~230 ± 25℃). Zircon radiation damage accumulated time, namely zircon radiation damage age, can be obtained by combing the accumulated α-fluence calculated by the Raman FWHM(ν3) with U and Th concentrations measured. Compared with other low-temperature thermochronology methods, this method shows a broad application prospect in geological research due to the advantages of simple test, high efficiency, low cost, and double(multiple) dating, which has been successfully applied to the fields of tracing source areas and revealing pluton thermal events presently. However, there exist several key issues to be solved for the dating method, such as spatial mismatch of experimental measurements on a micro-scale, uncertainty in closure temperature, and a relatively large deviation in zircon radiation damage age, which undoubtedly restrict the further popularization and application of this method in the field of earth sciences. This contribution systematically introduces the origin, theory, and calculation process of the method, summarizes some important progress of the related applications, discusses briefly the remaining research problems of the zircon radiation damage dating method, and looks forward to the development trends of this method to provide a new technical method for the development of geological chronology in the future.

关 键 词：锆石 辐射损伤测年 退火 地质应用 不确定性 

分 类 号：P597.3[天文地球—地球化学]