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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Partial core vaporization during Giant Impacts inferred from the entropy and the critical point of iron
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Partial core vaporization during Giant Impacts inferred from the entropy and the critical point of iron

机译：从熵和临界点推断出巨大影响过程中的部分核心蒸发

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摘要

Giant impacts are disruptive events occurring in the early stages of planetary evolution. They may result in the formation of a protolunar disk or of a synestia. A central planet and one or several moons condense upon cooling bearing the chemical signature of the silicate mantles of the initial bodies; the iron cores may partly vaporize, fragment and/or merge. Here we determine from ab initio simulations the critical point of iron in the temperature range of 9000-9350 K, and the density range of 1.85-2.40 g/cm(3), corresponding to a pressure range of 4-7 kbars. This implies that the iron core of the proto-Earth may become supercritical after giant impacts and during the condensation and cooling of the protolunar disk. We show that the iron core of Theia partially vaporized during the Giant Impact. Part of this vapor may have remained in the disk, to eventually participate in the Moon's small core. Similarly, during the late veneer a large fraction of the planetesimals have their cores undergoing partial vaporization. This would help mixing the highly siderophile elements into magma ponds or oceans. (C) 2020 The Author(s). Published by Elsevier B.V.
机译：巨大的影响是行星演化的早期阶段发生的破坏性事件。它们可能导致形成原料磁盘或句子。在轴承初始体的硅酸盐罩的化学特征的冷却时，中央行星和一个或几个卫生浓缩;铁芯可以部分蒸发，片段和/或合并。在这里，我们从AB Initio模拟中测定铁的临界点，温度范围为9000-9350 K，密度范围为1.85-2.40g / cm（3），对应于4-7 kbars的压力范围。这意味着在巨大的撞击和凝结和冷却过程中，原型地球的铁芯可能变得超临界。我们表明，在巨大的撞击期间，AIRA的铁芯部分蒸发。部分蒸汽的一部分可能仍然在磁盘中，最终参加月球的小核心。同样，在后期贴面期间，一大部分的行星将其核心接受部分蒸发。这有助于将高度长的毛利素元素混合到岩浆池塘或海洋中。 （c）2020提交人。由elsevier b.v出版。

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