(U-Th)/He热年代学方法研究进展及其应用
Advances of the(U-Th)/He thermochronology and its applications
胡儒权 1武丽艳2
作者信息
- 1. 中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州贵阳 550081;中国科学院大学,北京 100049
- 2. 中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州贵阳 550081
- 折叠
摘要
(U-Th)/He热年代学方法基于矿物中U、Th、Sm发生衰变产生和累积的4He进行定年.由于低的封闭温度和对近地表地质过程的敏感性,因此在定量揭示地壳浅部所经历冷却及剥露事件的时间-空间-温度特征方面具有不可替代的优势.本文简要回顾了(U-Th)/He定年原理并对不同测试方法的优缺点进行评述,在此基础上总结探讨了(U-Th)/He热年代学在辐射损伤影响机制、退火动力学以及4He扩散模型方面取得的进展以及存在的不足,并对如何完善这些不足进行未来展望.此外本文还综述了(U-Th)/He热年代学方法在约束成矿时代、造山带剥露历史研究、矿床保存性评价方面的应用实例以及部分局限性.
Abstract
The(U-Th)/He thermochronology is a dating method based on the accumulated 4He which was produced by the decay of parent isotopes including 238U,235U,232Th,and 147Sm.It has an irreplaceable advantage in quantitatively revealing the time-space-temperature characteristics of cooling and exhumation events occurred in the shallow level of crust,due to its low closure temperature and good sensitivity to near-surface geological processes.In this paper,we have briefly reviewed the principle of the(U-Th)/He thermochronology,and also reviewed the advantages and disadvantages of different analytical methods of the(U-Th)/He thermochronology.On this basis,we have summarized and discussed advances and shortcomings of(U-Th)/He thermochronology in terms of the mechanism of radiation damage on the diffusion behavior of 4He,annealing kinetics and the 4He diffusion model,and have prospected how to improve these shortcomings in the future.In addition,we have also reviewed the application examples and some limitations of the(U-Th)/He thermochronology method in the constraint of metallogenic epoch,exhumation history of the orogenic belt,and preservation evaluation of ore deposits.
关键词
(U-Th)/He热年代学/辐射损伤/退火动力学/4He扩散模型/地质应用Key words
(U-Th)/He thermochronology/radiation damage/annealing kinetics/4He diffusion model/geological application引用本文复制引用
基金项目
国家自然科学基金(41773048)
中国科学院"西部青年学者"项目(A类)()
出版年
2024
NETL
NSTL
万方数据