Chalcophile and Siderophile Elements in the Inner Solar System

9614457 Halliday该提案将侧重于通过研究亲铜和亲铁元素丰度和同位素组成来限制地月系统的早期演化。 Zn、Ga、Ge、Mo、Ru、Pd、Ag、Cd、In、Sn、Te、W、Ir、Pt和Tl的浓度将通过同位素稀释法测定，主要使用MC-ICPMS新技术。 然后，同位素组成和浓度数据将用于测试吸积和核心形成的模型。 太阳系内核形成和吸积的历史将通过高精度的陨石、早期月岩和无球粒陨石的W同位素组成来约束。 此外，还将开发铅铊地质年代学，以探索月球和其他太阳系内天体上挥发性元素主要耗尽的时间，并可能测量差异陨石的精确年龄。

9614457 Halliday This proposal will focus on placing constrains on the early evolution of the Earth-Moon system by studying chalcophile and siderophile element abundances and isotopic compositions. The concentrations of Zn, Ga, Ge, Mo, Ru, Pd, Ag, Cd, In, Sn, Te, W, Ir, Pt and Tl will be determined by isotope dilution, primarily using the new technique of MC-ICPMS. Isotopic compositions and concentration data will then be used to test models of accretion and core formation. The history of core formation and accretion in the inner solar system will be constrained using high precision W isotopic compositions of chondritic meteorites, early lunar rocks and achondrites. In addition, Pb-Tl geochronology will be developed in order to explore the timing of the dominant depletion of volatile elements on the Moon and other inner solar system objects, and possibly to allow measurement of precise ages for differentiated meteorites.