Impact melting and vaporization of the Earth-Moon system.

地月系统的撞击熔化和汽化。

• 批准号: 1631737
• 金额: --
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2015
• 资助国家: 英国
• 起止时间: 2015 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1631737
• 关键词: Impact; melting; vaporization; Earth; Moon

The goal the project is to determine the thermodynamic properties of silicate liquids that control the response of rocky plants to large impacts using first principles molecular dynamics simulations. Such simulations have already had an important impact on our views of magma ocean evolution, for example, leading to the idea of the basal magma ocean. A coordinated suite of new simulations are needed to make progress. In particular the pressure-temperature regime relevant to large impacts remains unexplored: a symmetric impact at Keplerian velocity generates a peak pressure of 1000 GPa (1 TPa), 7 times the pressure at the base of Earth's mantle. Yet learning about material behavior at these conditions is essential for understanding the consequences if large impacts, including the depth of melting, and the amount and composition of vapor produced on release. The results will provide a rich source of information on the physical properties of silicate liquids, and will constrain the fundamental thermodynamic relation of silicate liquids over the entire pressure-temperature regime relevant to large impacts and the magma ocean.

该项目的目标是确定硅酸盐液体的热力学性质，控制岩石植物的反应，使用第一原理分子动力学模拟大的影响。这种模拟已经对我们对岩浆海洋演化的看法产生了重要影响，例如，导致了基底岩浆海洋的想法。要取得进展，需要一套协调一致的新模拟。特别是与大型撞击有关的压力-温度状况尚未探索：开普勒速度的对称撞击产生的峰值压力为1000 GPa（1 TPa），是地球地幔底部压力的7倍。然而，了解这些条件下的材料行为对于理解大规模撞击的后果至关重要，包括熔化的深度以及释放时产生的蒸汽的数量和成分。结果将提供丰富的信息来源的硅酸盐液体的物理性质，并将限制硅酸盐液体的基本热力学关系在整个压力-温度制度有关的大的影响和岩浆海洋。