A South Pole-Aitken impact origin of the lunar compositional asymmetry.

Autor:	Jones MJ; Department of Earth, Environmental and Planetary Sciences, Brown University, Box 1846, 324 Brook Street, Providence, RI 02912, USA., Evans AJ; Department of Earth, Environmental and Planetary Sciences, Brown University, Box 1846, 324 Brook Street, Providence, RI 02912, USA., Johnson BC; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN 47907, USA.; Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA., Weller MB; Department of Earth, Environmental and Planetary Sciences, Brown University, Box 1846, 324 Brook Street, Providence, RI 02912, USA.; Lunar and Planetary Institute, Houston, TX 77058, USA., Andrews-Hanna JC; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA., Tikoo SM; Department of Geophysics, Stanford University, Stanford, CA 94305, USA., Keane JT; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
Jazyk:	angličtina
Zdroj:	Science advances [Sci Adv] 2022 Apr 08; Vol. 8 (14), pp. eabm8475. Date of Electronic Publication: 2022 Apr 08.
DOI:	10.1126/sciadv.abm8475
Abstrakt:	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.
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu