Expedited Cooling of the Lunar Magma Ocean Due to Impacts
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منابع مشابه
Experimental Constraints on Composition of Lunar Magma Ocean from Physical Properties of Magma
Introduction: It has been widely accepted that the lunar anorthosite crust formed by floatation of anorthite in the magma ocean at the time of a giant impact of the Earth-Moon system formation. The positive Eu-anomaly in lunar anothosites and the absence of mafic components in the lunar crust that contain complementary negative Eu-anomalies can also be the evidence of formation of the anorthosi...
متن کاملThe Stress State of a Cooling
Introduction: Understanding the Moon's thermal and magmatic evolution entails understanding the origin of the earliest crust, in particular whether it formed from a magma ocean [1]. The energy of late stage planet-building impacts would be at least sufficient to form magma oceans and possibly enough to melt whole planets [2]. The solidification history of the magma ocean will place constraints ...
متن کاملContraction or expansion of the Moon's crust during magma ocean freezing?
The lack of contraction features on the Moon has been used to argue that the Moon underwent limited secular cooling, and thus had a relatively cool initial state. A cool early state in turn limits the depth of the lunar magma ocean. Recent GRAIL gravity measurements, however, suggest that dikes were emplaced in the lower crust, requiring global lunar expansion. Starting from the magma ocean sta...
متن کاملWater in lunar anorthosites and evidence for a wet early Moon
The Moon was thought to be anhydrous since the Apollo era1, but this view has been challenged by detections of water on the lunar surface2–4 and in volcanic rocks5–9 and regolith10. Part of this water is thought to have been brought through solarwind implantation2–4,7,10 and meteorite impacts2,3,7,11, long after the primary lunar crust formed from the cooling magma ocean12,13. Here we show that...
متن کاملTidal dissipation in the lunar magma ocean and its effect on the early evolution of the Earth-Moon system
The present-day inclination of the Moon reflects the entire history of its thermal and orbital evolution. The Moon likely possessed a global magma ocean following the Moon-forming impact. In this work, we develop a coupled thermal-orbital evolution model that takes into account obliquity tidal heating in the lunar magma ocean. Dissipation in the magma ocean is so effective that it results in ra...
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تاریخ انتشار 2017