globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116463
论文题名:
Partial core vaporization during Giant Impacts inferred from the entropy and the critical point of iron
作者: Li Z.; Caracas R.; Soubiran F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 547
语种: 英语
中文关键词: core vaporisation ; critical point ; entropy ; Giant Impacts ; iron
英文关键词: Silicates ; Uncertainty analysis ; Vaporization ; Ab initio simulations ; Chemical signatures ; Disruptive event ; Highly siderophile elements ; Planetary evolutions ; Pressure ranges ; Silicate mantles ; Temperature range ; Iron ; core (planetary) ; critical state ; entropy ; impact structure ; iron ; magma ; Moon ; siderophile element ; vaporization
英文摘要: 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/cm3, 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. © 2020 The Author(s)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165110
Appears in Collections:气候变化与战略

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作者单位: CNRS, Ecole Normale Supérieure de Lyon, Laboratoire de Géologie de Lyon UMR 5276, Centre Blaise Pascal, 46 allée d'Italie, Lyon, 69364, France; The Center for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo, Norway

Recommended Citation:
Li Z.,Caracas R.,Soubiran F.. Partial core vaporization during Giant Impacts inferred from the entropy and the critical point of iron[J]. Earth and Planetary Science Letters,2020-01-01,547
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