Mathematics – Logic
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mbns.conf...56s&link_type=abstract
The Moon Beyond 2002: Next Steps in Lunar Science and Exploration, p. 56
Mathematics
Logic
Structural Basins, Lunar Surface, Lunar Maria, Ejecta, Lunar Maps, Thorium, Antipodes
Scientific paper
Multi-ring basins are the largest impact events in lunar history and have catastrophic, global effects on the Moon. Ejecta from these events may travel over great distances, but the thickness of the ensuing debris blanket thins quickly as one goes away from the basin rim. Because impact events tend to (more or less) eject material equidistant from the point of impact, distal ejecta converge from all directions at the basin antipodes, possibly resulting in an anomalously large accumulation of ejecta at that point. Antipodal concentrations of ejecta may have resulted in both anomalous compositional and geophysical relations seen in some regions of the Moon. This hypothesis has recently been revived, with the specific proposal that anomalously high contents of Th found near the far side crater Van De Graaf are concentrations of Imbrium basin ejecta, antipodal to that impact feature. We have previously described techniques designed to map rock units on the Moon using Clementine and LP elemental data. These maps show how compositions vary regionally and allow us to directly compare regions distant from each other. We have used the petrologic maps to address the question of recognizable antipodal deposits of basin ejecta.
Fessler Brian
Spudis Paul D.
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