Terrestrial magma ocean origin of the Moon

Terrestrial magma ocean origin of the Moon
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月球的陆地岩浆海洋起源

DOI:
10.1038/s41561-019-0354-2
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发表时间:
2019
期刊:
影响因子:
18.3
通讯作者:
TR.
TR.
中科院分区:
地球科学1区
文献类型:
--
作者:
Hosono;N.;Karato;S.;Makino;J.;Saitoh;TR.

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月球起源的概念框架必须解释地月系统的化学和力学特征才是可行的。经典的斜向巨型撞击概念解释了月球的角动量大,而且缺乏一个大型的富铁核心,但在这种情况下,很难在不违反角动量约束的情况下解释地球和月球同位素组成的相似性。在这里,我们提出,一个巨大的,固体撞击物击中了原始地球,而它被岩浆海洋覆盖,在传统的碰撞条件下。我们进行密度无关的光滑粒子流体动力学碰撞模拟与状态方程适合熔融硅酸盐。这些计算表明,由于硅酸盐熔体和固体(岩石)之间的冲击加热差异很大,即使在高度倾斜的碰撞中,也有相当大一部分喷出的月球形成物质来自岩浆海洋。我们表明,该模型调和月球和地球之间的成分相似性和差异,同时满足角动量约束。
A conceptual framework for the origin of the Moon must explain both the chemical and the mechanical characteristics of the Earth–Moon system to be viable. The classic concept of an oblique giant impact explains the large angular momentum and the lack of a large iron-rich core to the Moon, but in this scenario it is difficult to explain the similarity in the isotopic compositions of the Earth and Moon without violating the angular momentum constraint. Here we propose that a giant, solid impactor hit the proto-Earth while it was covered with a magma ocean, under the conventional collision conditions. We perform density-independent smoothed particle hydrodynamic collision simulations with an equation of state appropriate for molten silicates. These calculations demonstrate that, because of the large difference in shock heating between silicate melts and solids (rocks), a substantial fraction of the ejected, Moon-forming material is derived from the magma ocean, even in a highly oblique collision. We show that this model reconciles the compositional similarities and differences between the Moon and Earth while satisfying the angular momentum constraint.
DOI: 10.1186/bf03352378
发表时间: 2001
期刊: Earth, Planets and Space
影响因子: --
作者:
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DOI: --
发表时间: 2014
期刊: Proceedings of the Japan Academy. Series B, Physical and biological sciences
影响因子: --
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发表时间: 2015-05-15
期刊: ICARUS
影响因子: 3.2
作者:
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