首页> 外文期刊>Geochemistry: Interdisciplinary Journal for Chemical Problems of the Geosciences and Geoecology >A unified model for hydrogen in the Earth and Moon: No one expects the Theia contribution
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A unified model for hydrogen in the Earth and Moon: No one expects the Theia contribution

机译:地球和月亮中氢的统一模型:没有人希望贡献贡献

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摘要

The Moon is thought to have formed after a planetary embryo, known as Theia, collided with the proto-Earth 4.5 billion years ago. This so-called Giant Impact was the last major event during Earth's accretion, and its effects on the composition of the Earth and the newly forming Moon would be measureable today. Recent work on lunar samples has revealed that the Moon's water was not lost as a result of this giant impact. Instead, the Moon appears to contain multiple hydrogen reservoirs with diverse deuterium-to-hydrogen (D/H) ratios. For the first time, we incorporate hydrogen isotopic measurements of lunar samples to help constrain the composition of Theia. We show that the Moon incorporated very low-D/H (delta D approximate to -750 parts per thousand) materials that only could have derived from solar nebula H-2 ingassed into the magma ocean of a large (similar to 0.4 M-E) planetary embryo that was largely devoid of chondritic water. We infer Theia was a very large body comparable in size to the proto-Earth, and was composed almost entirely of enstatite chondrite-like material. These conclusions limit the type of impact to a "merger" model of similarly-sized bodies, or possibly a "hit-and-run" model, and they rule out models that mix isotopes too effectively.
机译:月亮被认为是在一个被称为isia的行星胚胎之后形成,与205亿年前的原始地球相撞。这种所谓的巨大影响是地球增生期间的最后一次重大事件,其对地球组成和新成型月亮的影响将是今天的可衡量的。最近的农历样本的工作透露,由于这种巨大的影响,月亮的水不会丢失。相反,月亮似乎含有多种氘 - 氢气(D / H)比具有多种氢储层。我们首次掺入了月球样品的氢同位素测量,以帮助限制神的组成。我们表明月亮掺入非常低于D / H(Delta D近似至-750份)材料,这些材料只能源于太阳星云H-2 IndAcse的大型(类似于0.4 Me)行星胚胎主要缺乏白蛋白水。我们推断IRIA是一个非常大的身体,其大小与原型地球相当,并且几乎完全由富尔特酸盐脱衣石的材料组成。这些结论限制了对类似尺寸体的“合并”模型的影响类型,或可能是“命中和运行”模型,并排除了太有效混合同位素的模型。

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