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A South Pole-Aitken Impact Origin of the Lunar Compositional Asymmetry

Overview
Journal Sci Adv
Specialties Biology
Science
Date 2022 Apr 8
PMID 35394845
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Abstract

The formation of the largest and most ancient lunar impact basin, South Pole-Aitken (SPA), was a defining event in the Moon's evolution. Using numerical simulations, we show that widespread mantle heating from the SPA impact can catalyze the formation of the long-lived nearside-farside lunar asymmetry in incompatible elements and surface volcanic deposits, which has remained unexplained since its discovery in the Apollo era. The impact-induced heat drives hemisphere-scale mantle convection, which would sequester Th- and Ti-rich lunar magma ocean cumulates in the nearside hemisphere within a few hundred million years if they remain immediately beneath the lunar crust at the time of the SPA impact. A warm initial upper mantle facilitates generation of a pronounced compositional asymmetry consistent with the observed lunar asymmetry.

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References
1.
Wieczorek M, Neumann G, Nimmo F, Kiefer W, Jeffrey Taylor G, Jay Melosh H . The crust of the Moon as seen by GRAIL. Science. 2012; 339(6120):671-5. PMC: 6693503. DOI: 10.1126/science.1231530. View

2.
Neumann G, Zuber M, Wieczorek M, Head J, Baker D, Solomon S . Lunar impact basins revealed by Gravity Recovery and Interior Laboratory measurements. Sci Adv. 2015; 1(9):e1500852. PMC: 4646831. DOI: 10.1126/sciadv.1500852. View

3.
Marinova M, Aharonson O, Asphaug E . Mega-impact formation of the Mars hemispheric dichotomy. Nature. 2008; 453(7199):1216-9. DOI: 10.1038/nature07070. View

4.
Garrick-Bethell I, Nimmo F, Wieczorek M . Structure and formation of the lunar farside highlands. Science. 2010; 330(6006):949-51. DOI: 10.1126/science.1193424. View

5.
Andrews-Hanna J, Zuber M, Banerdt W . The Borealis basin and the origin of the martian crustal dichotomy. Nature. 2008; 453(7199):1212-5. DOI: 10.1038/nature07011. View