Impact melting and vaporization of the Earth-Moon system.

该项目的目标是利用第一性原理分子动力学模拟来确定控制岩石植物对大撞击反应的硅酸盐液体的热力学性质。这样的模拟已经对我们对岩浆海演化的看法产生了重要影响，例如，导致了基底岩浆海的想法。要取得进展，需要一套协调的新模拟。特别是与大型撞击相关的压力-温度状态仍未被探索：以开普勒速度对称撞击产生的峰值压力为1000 GPa (1 TPa)，是地幔底部压力的7倍。然而，了解这些条件下的物质行为对于理解大影响的后果至关重要，包括融化的深度，以及释放时产生的蒸汽的数量和成分。这些结果将为硅酸盐液体的物理性质提供丰富的信息来源，并将约束硅酸盐液体在与大碰撞和岩浆海洋相关的整个压力-温度状态下的基本热力学关系。

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.