地质学报2025，Vol.99Issue(6)：1865-1887,23.DOI:10.19762/j.cnki.dizhixuebao.2025147
激光微区Lu-Hf定年技术原理和地质应用
Principle and geological applications of laser ablation Lu-Hf dating technology
摘要
Abstract
Isotope geochronology stands as one of the cornerstone disciplines within Earth science research.The Lu-Hf dating system,based on the radioactive decay of 176 Lu to 176 Hf,has emerged as a vital tool for determining the ages of high-grade metamorphic rocks,mafic-ultramafic rocks,and phosphorites.Recent breakthroughs in tandem mass spectrometry,utilizing reactive ammonia gas,have revealed its differential interaction with Lu,Yb,and Hf.This discovery has enabled the online separation of the daughter isotope 176 Hf from its parent 176 Lu and the isobaric interferent 176 Yb by measuring+82 high-mass Hf reaction products(176 Hf(14N1H)(14N1H2)(14N1H3)3).When integrated with laser ablation systems,this technique successfully implemented laser microbeam Lu-Hf dating.Today,this methodology has achieved remarkable advancements in analytical instrumentation,collision reaction mechanisms,calibration techniques,uncertainty evaluation,and the creation of reference materials,garnering widespread application in geological studies.This article meticulously outlines the principles underlying the laser microbeam Lu-Hf dating system,chronicles its evolution,and examines its geological applications.It offers a thorough overview of the technology's key advancements,encompassing instrumentation,reactive gases,calibration methodologies,software development,uncertainty analysis,and the innovation of reference materials.The technology has yielded significant findings in the investigation of metamorphic rocks,mafic rocks,sedimentary rocks,mineral deposits,and extraterrestrial specimens.This article methodically compiles these application instances,delivering a profound analysis of the Lu-Hf system's benefits and the critical importance of microbeam analysis.Drawing on the present state of research,this article addresses the principal challenges facing this technology and offers a forecast of its prospective applications in the field of geology.关键词
激光微区Lu-Hf定年/串级质谱仪/富Lu矿物/石榴子石Lu-Hf定年/稀土矿定年Key words
Laser ablation Lu-Hf geochronology/tandem mass spectrometer/Lu-rich minerals/garnet Lu-Hf geochronology/rare earth mineral geochronology引用本文复制引用
吴石头,王浩,杨岳衡,杨进辉,吴福元..激光微区Lu-Hf定年技术原理和地质应用[J].地质学报,2025,99(6):1865-1887,23.基金项目
本文为国家自然科学基金项目(编号 42273034)和中国科学院青年创新促进会项目(编号 2022066)联合资助的成果. （编号 42273034）
