Weak links mar lunar model

SARAH T. STEWART

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Weak links mar lunar model

机译：弱链接mar月球模型

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摘要

The giant-impact hypothesis of lunar origin is celebrated for its simplicity: a late, grazing impact on the proto-Earth launches a portion of the rocky mantle into orbit and establishes the angular momentum of the Earth-Moon system (Fig. 1b). The Moon, depleted of iron and volatile elements relative to Earth, forms from this hot circumterrestrial disk of rocky mantle. Hydrodynamic simulations of giant impacts successfully produce disks of low iron content and sufficient mass to make this hypothesis plausible. The fatal issue is that simulations that lead to the present angular momentum derive most disk material from the impactor7. Thus, the giant-impact model predicts that Earth and the Moon should be derived from different source material, each with distinct isotopic fingerprints, and this contradicts the geochemical (isotopic) observations.

机译：月亮起源的巨大影响假说以其简单性而著称：对原始地球的晚期掠食撞击将一部分岩石地幔发射入轨道，并建立了地球-月亮系统的角动量（图1b）。相对于地球而言，月球贫乏的铁和挥发性元素，是由这个热的岩石地幔环绕地球的圆盘形成的。巨大撞击的流体动力学模拟成功地产生了铁含量低且质量足以使该假设合理的圆盘。致命的问题是，导致当前角动量的模拟会从撞击器中提取出大多数磁盘材料。因此，巨大影响模型预测地球和月球应该来自不同的源物质，每个源物质具有不同的同位素指纹，这与地球化学（同位素）观测结果相矛盾。

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来源
《Nature》 |2013年第7478期|90-91|共2页
作者
SARAH T. STEWART;
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作者单位

Department of Earth and Planetary Sciences, Harvard University,Cambridge, Massachusetts 02138, USA;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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Weak links mar lunar model

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