Origin of the depletion of siderophile volatile elements in Earth, Mars and the aubrite parent body

地球、火星和赤铁矿母体中亲铁挥发性元素消耗的起源

基本信息

批准号：
242130583
负责人：
Professor Dr. Harry Becker
金额：
--
依托单位：
Institut für Geologische Wissenschaften
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/242130583?language=en
关键词：
Origin depletion siderophile volatile elements

项目摘要

New data on the composition and evolution of the terrestrial planets suggest that the heterogeneous accretion model currently favored for Earth, accretion of reduced, volatile poor material followed by oxidized, volatile rich material, may not be generally applicable. Mars, and possibly also Mercury, have similar or higher abundances of moderately volatile elements than Earth, and may have accreted before accretion of Earth was completed. To complicate matters, abundances of highly volatile elements in Earth may be higher than in Mars. The role of late accretion of undifferentiated material after core formation (late veneer) for the volatile element budget of the terrestrial planets remains unclear. Abundances of highly siderophile elements indicate that Earth, Moon, Mars and parent bodies of some differentiated meteorites all have been affected by a late veneer. Here, new concentration data of siderophile volatile elements (S, Se, Te, Cd, Tl, Cu, Ag, In, Pb) will be obtained to study the influence of core formation and the composition of the late veneer on abundances of volatile elements in the silicate earth, Mars, and in the aubrite parent body (a model for Mercury?). The data will be used with data for other volatile elements and experimental studies to obtain new insights into the distribution of volatile elements in the terrestrial planets.

关于陆地行星的组成和演变的新数据表明，目前喜欢地球的异质增生模型，减少，挥发性差的材料的积聚，然后是氧化富含挥发性的富含材料，通常不适用。火星，可能还有汞，比地球具有相似或更高的中度挥发性元素的丰富性，并且可能在完成地球的积聚之前就有积聚。使事情复杂化，地球上高度挥发的元素可能高于火星。核心形成后未分化材料的后期积聚（晚期贴面）对于陆地行星挥发性元素预算的作用尚不清楚。大量的铁质元素的丰富性表明，某些差异化陨石的地球，月亮，火星和母体都受到了晚饰面的影响。在这里，将获得铁粒挥发性元件的新浓度数据（S，SE，TE，CD，TL，Cu，Ag，in，Pb），以研究核心形成的影响以及晚饰板的组成对挥发性元件的丰富度在硅酸盐地球，火星和aubrite父母中（汞的模型？）。数据将与其他挥发性元素和实验研究的数据一起使用，以获取对陆地行星中挥发性元件的分布的新见解。