Asymmetric shock heating and the terrestrial magma ocean origin of the Moon
Asymmetric shock heating and the terrestrial magma ocean origin of the Moon
复制标题
不对称激波加热与月球的陆地岩浆海洋起源
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
S. Karato
中科院分区：
文献类型：
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作者：
S. Karato
目前月球起源的大撞击模型的困难之一是解释同位素组成的显著相似性和主要元素化学的实质性差异。冲击加热的物理分析表明，加热程度是不对称的冲击和目标之间，如果目标（原地球）有一个岩浆海洋，但冲击没有。岩浆海洋比固体撞击物加热得多，富含蒸汽的喷流主要来自可能形成月球的岩浆海洋。在这种情况下，月球和地球之间成分的相似性和差异将被解释为行星形成后期碰撞的自然结果。包括冲击加热的不对称性是解释月球化学成分的第一步。
One of the difficulties of the current giant impact model for the origin of the Moon is to explain the marked similarity in the isotopic compositions and the substantial differences in the major element chemistry. Physics of shock heating is analyzed to show that the degree of heating is asymmetric between the impactor and the target, if the target (the proto-Earth) had a magma-ocean but the impactor did not. The magma ocean is heated much more than the solid impactor and the vapor-rich jets come mainly from the magma-ocean from which the Moon might have been formed. In this scenario, the similarity and differences in the composition between the Moon and Earth would be explained as a natural consequence of a collision in the later stage of planetary formation. Including the asymmetry in shock heating is the first step toward explaining the chemical composition of the Moon.