岩石矿物学杂志2026，Vol.45Issue(2)：393-405,13.DOI:10.20086/j.cnki.yskw.2026.5093
裂变径迹与(U-Th)/He年龄倒转的成因机理及地质意义
Fission-track and (U-Th)/He age inversion:Genetic mechanisms and geological implications
摘要
Abstract
The exhumation of geological bodies is a product of interactions among Earth's spheres.Precisely deter-mining the timing and processes of exhumation has become a crucial aspect of modern Earth system science.Ther-mochronological techniques,particularly fission-track and(U-Th)/He dating,play a central role in this endeavor.Conventionally,for the same mineral type within a single rock sample,the fission-track age should be greater than or equal to the corresponding(U-Th)/He age.However,the phenomenon of the(U-Th)/He age appears older than the fission-track age,and significant dispersion of single-grain(U-Th)/He ages beyond analytical error are common yet often overlooked anomalies in low-temperature thermochronology.This paper aims to clarify potential misconceptions in interpreting thermochronological data and provides a concise yet systematic review of the interplay among factors such as the accumulation and annealing of radiation damage,the U-Th zonation,thermal history,and mineral chemical composition.These factors can significantly alter the annealing behavior of fission tracks and the diffusion behavior of 4He within crystals,leading to a decrease in the fission-track annealing temperature and an in-crease in the(U-Th)/He closure temperature,thereby resulting in age inversion.The dispersion of single-grain(U-Th)/He ages and the inversion between fission-track and(U-Th)/He ages often carry important geological information,providing key clues for interpreting complex thermal histories.关键词
裂变径迹/(U-Th)/He/倒转年龄/辐射损伤/氦扩散/径迹退火/热历史Key words
fission track/(U-Th)/He/inverted age pattern/radiation damage/helium diffusion/track annea-ling/thermal history分类
天文与地球科学引用本文复制引用
张斌,陈文,杨静,孙敬博,赵双丰,刘嘉麒..裂变径迹与(U-Th)/He年龄倒转的成因机理及地质意义[J].岩石矿物学杂志,2026,45(2):393-405,13.基金项目
国家自然科学基金项目(42127801) （42127801）
深地国家科技重大专项(2025ZD1004701) （2025ZD1004701）
中国地质科学院地质研究所基本科研业务费项目(J2311) National Natural Science Foundation of China(42127801) （J2311）
Deep Earth Probe and Mineral Resources Exploration—National Science and Technology Major Project(2025ZD1004701) （2025ZD1004701）
Basic Scientific Research Fund of the Institute of Geology,Chinese Academy of Geological Sciences(J2311) （J2311）
