近日，北京大学李扬团队研究了硫化物和富有机物沉积物的Re-Os年代学。这一研究成果发表在2025年7月23日出版的《科学通报》杂志上。

铼和锇都是亲铁和亲铜，对富有机物具有很强的亲和力。这使得Re-Os计时器成为基于亲石元素的地质计时器的一个有价值的补充。

在这篇综述中，研究组首先强调元素丰度和同位素组成在样品选择、分析和数据解释中的重要性。然后，该团队概述了如何以¹⁸⁷Os/¹⁸⁸Os比率为主题来追踪地质过程，然后总结了Re-Os地球化学中常见的分析方案。研究组还解决了等时线测年中的关键挑战，包括识别和避免混合线和继承初始斜率等缺陷。

利用最先进的Re-Os测年技术，辉钼矿的测年精度可达0.05%，富有机质沉积岩的测年精度可达1%，现在有可能解决矿石形成的快速、幕式性质，并以前所未有的细节研究环境-生命共同进化的动力学。最后，研究组概述了Re-Os地质年代学的未来发展方向，包括成像引导的富有机质沉积物Re-Os测年、原位Re-Os测年以及Re-Os地质年代学与EarthTime计划的全面整合。

附：英文原文

Title: Re-Os geochronology for sulfides and organic-rich sediments

Author: Li, Yang, Glorie, Stijn, Selby, David

Issue&Volume: 2025-07-23

Abstract: Rhenium and osmium are both siderophile and chalcophile, exhibiting a strong affinity for organic-rich materials. This makes the Re-Os chronometer a valuable complement to geochronometers based on lithophile elements. In this review, we begin by emphasizing the importance of elemental abundances and isotopic compositions associated with sample selection, analysis, and data interpretation. We then provide an overview of how 187Os/188Os ratios can be used to trace geological processes, followed by a summary of the analytical protocols commonly used in Re-Os geochemistry. We also address key challenges in isochron dating, including the identification and avoidance of pitfalls such as mixing lines and inherited initial slopes. With state-of-the-art Re-Os dating reaching precisions up to 0.05% for molybdenites and 1% for organic-rich sedimentary rocks, it is now possible to resolve the rapid, episodic nature of ore formation and to investigate the dynamics of environment-life coevolution with unprecedented detail. We conclude by outlining future directions for Re-Os geochronology, including advances in imaging-guided Re-Os dating for organic-rich sediments, in situ Re-Os dating and the full integration of the Re-Os geochronometer into the EarthTime initiative.

DOI: 10.1093/nsr/nwaf300

Source: https://academic.oup.com/nsr/advance-article/doi/10.1093/nsr/nwaf300/8211040searchresult=1