The group IIF iron meteorites and Eagle Station pallasites (PES) have highly siderophile element abundances (HSE; Re, Os, Ir, Ru, Pt, and Pd) of metal that are consistent with formation in planetesimal cores by fractional crystallization with minor to major solid metal–liquid metal mixing. Modeling of HSE abundances of the IIF irons indicates a complex formation history that included the mixing of primitive and evolved solid and liquid metals. By contrast, modeling of HSE abundances of PES metal suggests these meteorites formed mainly as equilibrium solids from a common liquid. Abundances of some of the siderophile elements in the IIF irons and PES are permissive of a common core origin; however, the abundances of W and Ni indicate the PES ultimately formed on a more oxidized body. The PES most likely formed by the injection of olivine present at the core–mantle boundary into a metallic core liquid as a result of impact. The core then crystallized inward, trapping the olivine.

中文翻译：

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IIF铁陨石和Eagle Station滑石的结晶历史

IIF组铁陨石和Eagle Station陨石（PES）具有高度铁的亲铁元素元素含量（HSE； Re，Os，Ir，Ru，Pt和Pd），与通过小小至主要的分步结晶在小行星核中形成一致固态金属-液态金属混合。对IIF铁的HSE丰度进行建模表明了复杂的形成历史，其中包括原始金属和演化出的固态和液态金属的混合。相比之下，对PES金属的HSE丰度进行建模的结果表明，这些陨石主要是由一种普通液体形成的平衡固体。IIF铁和PES中某些亲铁元素的丰度允许共同的核心起源。但是，W和Ni的丰度表明PES最终形成在氧化程度更高的物体上。PES最有可能是由于撞击的结果，将存在于芯-幔边界的橄榄石注入金属芯液中而形成的。然后核心向内结晶，捕获橄榄石。