地质年代学
陨石
地质学
激光烧蚀
太空探索
天体生物学
地球科学
地球化学
物理
天文
激光器
光学
作者
Stijn Glorie,Thomas W. Burke,Martin Hand,Alexander I. F. Simpson,Sarah C. Gilbert,Benjamin P. Wade
标识
DOI:10.1016/j.gsf.2022.101375
摘要
• Individual pallasites were dated by laser ablation mass-spectrometry at <2% precision. • The results demonstrate a rapid method for exploring planetary evolution. • No laboratory sample preparation required, opening opportunities for remote application. Geochronology is fundamental to understanding planetary evolution. However, as space exploration continues to expand, traditional dating methods, involving complex laboratory processes, are generally not realistic for unmanned space applications. Campaign-style planetary exploration missions require dating methods that can (1) rapidly resolve age information on small samples, (2) be applied to minerals common in mafic rocks, and (3) be based on technologies that could be installed on future rover systems. We demonstrate the application of rapid in situ microanalytical Lu–Hf phosphate geochronology using samples of pallasite meteorites, which are representative examples of the deep interiors of differentiated planetoids that are generally difficult to date. Individual pallasites were dated by laser ablation tandem mass-spectrometry (LA-ICP-MS/MS), demonstrating a rapid novel method for exploring planetary evolution. Derived formation ages for individual pallasites agree with traditional methods and have <2% uncertainty, opening an avenue of opportunity for remote micro-analytical space exploration.
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