Physics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009psrd.repte.130m&link_type=abstract
Planetary Science Research Discoveries
Physics
Moon, Lunar, Impact Basins, Basin, Spa, Megaregolith, Regolith, Crust
Scientific paper
The Moon was pummeled to such a great extent that the materials we see today on the lunar surface are directly related to the materials excavated and ejected from ancient basin-forming events. The degree to which the far-flung ejecta from the Moon's largest basins influenced the distribution of observed geochemical terranes is the subject of work by Noah Petro (formerly of Brown University and now at NASA Goddard Space Flight Center) and Carle Pieters (Brown University). Using a basin ejecta model, they address two key global issues: (1) the cumulative amount of basin ejecta transported to all areas of the lunar surface and (2) the depths to which the ejecta is mixed into a zone called the early megaregolith. The fact that so much mixing has occurred on the Moon makes it seem surprising, at first glance, that there are any unique geochemical terranes at all. Petro and Pieters' work provides a more detailed look at the distribution of basin ejecta and explains the important role basins played in the early evolution of the lunar crust.
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