发表机构
University of Münster; Lawrence Livermore National Laboratory; Max Planck Institute for Solar System Research（明斯特大学; 劳伦斯利弗莫尔国家实验室; 马克斯·普朗克太阳系研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究发现钌同位素存在NC-CC二分性，示踪地球晚期增生层以NC物质为主，需更精确测量BSE的钌同位素以确定晚期增生层是否含CC物质。
AI 中文摘要
铁陨石的高精度非质量依赖钌同位素数据显示，在包含p过程钌核素⁹⁶Ru或⁹⁸Ru的三同位素图中，非碳质（NC）陨石沿s过程混合线分布，而碳质（CC）铁陨石则构成偏离NC线的聚类。如同此前对钼的观测，该偏移可通过CC物质相对于NC物质的r过程过剩来解释。钌作为高度亲铁元素，整体硅酸盐地球（BSE）中的钌被认为主要来自晚期增生层，这使得钌同位素二分性成为地球晚期增生阶段的有力遗传示踪剂。本研究中，BSE及前人研究定义的同位素异常伊萨岩群均落在本研究确定的NC线上，表明晚期增生层以NC物质为主，且可能随时间从更富s过程的组成演变为更贫s过程的组成。不过，需对BSE的组成开展更精确的⁹⁶Ru和⁹⁸Ru测量，以更可靠地确定晚期增生层的遗传起源，并量化其是否包含CC物质。
英文摘要
High-precision mass-independent Ru isotope data for iron meteorites reveal that in three-isotope diagrams including the p-process Ru nuclides 96Ru or 98Ru, non-carbonaceous (NC) meteorites plot along an s-process mixing line, while the carbonaceous (CC) type irons plot as a cluster off the NC-line. As previously observed for Mo, this offset can be accounted for by an r-process excess in CC over NC materials. As a highly siderophile element, Ru in the bulk silicate Earth (BSE) is thought to predominantly derive from the late veneer, making the Ru isotope dichotomy a powerful genetic tracer of Earth's late accretionary epoch. The BSE and the isotopically anomalous Itsaq Gneiss Complex as defined in prior studies plot on the NC-line defined in this study, suggesting a predominantly NC late veneer that may have evolved over time from more s-process-enriched to more s-process-depleted compositions. However, more precise 96Ru and 98Ru measurements of the BSE's composition are needed to more reliably determine the genetic heritage of the late veneer and to quantify as to whether it contains CC material.
CommentsAccepted for publication in Icarus
DOI：10.1016/j.icarus.2026.117308
