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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.

关于类地行星的组成和演化的新数据表明，目前对地球有利的异质吸积模型，即还原的、挥发性差的物质随后是氧化的、挥发性丰富的物质的吸积，可能不适用。火星，可能还有水星，有类似或比地球更高的中等挥发性元素丰度，可能在地球吸积完成之前就已经吸积了。更复杂的是，地球上高挥发性元素的丰度可能高于火星。核心形成后未分化物质的晚期吸积（晚期贴面）对类地行星挥发性元素预算的作用仍不清楚。高亲铁性元素的丰度表明，地球、月球、火星和一些分化陨石的母体都受到了晚期饰面的影响。在这里，新的亲铁挥发性元素（S，Se，Te，Cd，Tl，Cu，Ag，In，Pb）的浓度数据将被获得，以研究核心的形成和组合物的晚期单板上的挥发性元素的丰度在硅酸盐地球，火星，并在Aubrite母体（汞模型？）的影响。这些数据将与其他挥发性元素的数据和实验研究一起使用，以获得对类地行星中挥发性元素分布的新认识。