Siderophile Elements in Tracing Planetary Formation and Evolution.

IF 6.8 3区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Geochemical Perspectives Pub Date : 2016-01-01 Epub Date: 2016-04-01 DOI:10.7185/geochempersp.5.1
Richard J Walker
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引用次数: 35

Abstract

The siderophile, or iron-loving elements have many applications in the Earth and planetary sciences. In primitive meteorites, differences in the relative abundances of these elements are likely due to both nebular and parent body processes. In addition, some siderophile elements are also characterised by isotopically distinctive nucleosynthetic signatures. Thus, the relative abundances and isotopic compositions of these elements can be used to trace the genetics of primary planetary building blocks. Although these elements are largely concentrated in the metallic cores of differentiated planetary bodies, their absolute and relative abundances, as well as their isotopic compositions can also reveal important information regarding conditions of core formation and the chemical evolution of the silicate portions of the planetary bodies. The lithophile-siderophile nature of the radiogenic 182Hf-182W system allow it to be used to place chronologic constraints on planetary core formation. The differing incompatibilities of the two elements in silicate systems further mean that the system can also be used to study early differentiation processes and subsequent efficiency of mixing in the silicate portions of differentiated bodies, including Earth. The abundances of siderophile elements in the terrestrial mantle are used to assess primary and secondary melting processes, and resulting metasomatic interactions. In addition, the Re-Os isotope system can, in some instances, be used to place chronologic constraints on when these processes occurred. The abundances of siderophile elements, and 187Os/188Os and 186Os/188Os ratios in the mantle sources of ocean island basalts can be used to place constraints on the age of recycled materials, and in some instances, the types of recycled materials present in these mantle domains.

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追踪行星形成和演化过程中的营养因子。
亲铁元素在地球和行星科学中有许多应用。在原始陨石中,这些元素相对丰度的差异可能是由于星云和母体过程造成的。此外,一些亲铁元素还具有同位素独特的核合成特征。因此,这些元素的相对丰度和同位素组成可以用来追踪原始行星构建块的遗传学。尽管这些元素主要集中在不同行星体的金属核心中,但它们的绝对和相对丰度以及同位素组成也可以揭示有关核心形成条件和行星体硅酸盐部分化学演化的重要信息。182Hf-182W辐射成因系统的亲石亲铁性质使其能够用于对行星核心的形成施加时间限制。硅酸盐系统中两种元素的不同不相容性进一步意味着该系统还可用于研究早期分化过程以及随后在包括地球在内的分化体的硅酸盐部分混合的效率。陆地地幔中亲铁元素的丰度用于评估初级和次级熔融过程以及由此产生的交代相互作用。此外,在某些情况下,Re-Os同位素系统可以用于对这些过程何时发生施加时间限制。海岛玄武岩地幔源中亲铁元素的丰度以及187Os/188Os和186Os/188Os的比值可用于限制回收材料的年龄,在某些情况下,还可用于限制这些地幔域中存在的回收材料的类型。
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来源期刊
Geochemical Perspectives
Geochemical Perspectives GEOCHEMISTRY & GEOPHYSICS-
CiteScore
0.80
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1
期刊介绍: Each issue of Geochemical Perspectives presents a single article with an in-depth view on the past, present and future of a field of geochemistry, seen through the eyes of a highly respected member of our community. The articles combine science and history of the field’s development and the scientist’s opinions about future directions. We expect personal glimpses into the author’s scientific life, how ideas were generated, pitfalls and triumphs along the way, and how ideas were adopted to carry our field further. Perspectives articles are intended for the entire geochemical community, not for experts. They are not reviews or monographs or text books. They go beyond the current state of the art, providing opinions about future directions and impact in the field.
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