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Source: Moon-forming impactor as a source of Earth’s basal mantle anomalies

Moon-Forming Impactor as a Source of Earth’s Basal Mantle Anomalies. Contribution of M. Schaller and P. Kegerreis

The arguments for an Earth-like Moon-forming impactor were made by the authors. Philos. R.S. A 372, the week of August 28th, 2014.

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Source: Moon-forming impactor as a source of Earth’s basal mantle anomalies

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replenishment and destruction of chemical anomalies have been shown to survive in a vigorously convecting mantle for billions of years. J. Geophys. Res., Solid Earth 120, 3824–3847 (2015).

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Insights into the origin of the collision between the Earth and a smaller protoplanet: a unified model for hydrogen and the Moon

A giant collision between the young Earth and a smaller protoplanet has long been the prevailing theory for the Moon’s formation. Such an origin would explain features such as the Moon’s lack of many volatile compounds, which would have been vapourized during the collision with Earth.

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Yuan hopes that this and subsequent research could shed light on what has made Earth so unique — factors that might include the collision with Theia. This study, he says, suggests that “this giant impact [created] some heterogeneities in the Earth that can last for billions of years”.

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Maxim Ballmer, a geodynamicist at University College London, is not sure that this idea for the mantle anomalies will hold up. The model “definitely needs to be tested”, Ballmer says. I think that it is an idea worth pursuing.

The authors expanded their models. They found that the energy of the planetary smash-up would have partially melted Earth’s mantle, which would then have had two layers: a molten top and a mostly solid bottom.