Physics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992geoji.109..233m&link_type=abstract
Geophysical Journal International (ISSN 0956-540X), vol. 109, April 1992, p. 233-239. Research supported by SERC.
Physics
1
Basalt, Gravity Anomalies, Lunar Excavation Equipment, Lunar Geology, Structural Basins, Impact Damage, Lunar Craters, Lunar Maria, Lunar Surface, Topography
Scientific paper
In a paper by Mullis (1991), a model for the formation of the Imbrium gravity anomaly was described, which yielded estimates of both the maximum depth of excavation of the basin and depth of basalt fill in the resulting topographic depression. This model has now been extended to the Serenitatis, Humorum, Crisium, Nectaris, and Orientale basins. In each case, depth/diameter ratios for the original excavation close to 0.08 have been determined. This is much shallower than would be expected from extrapolation of depth/diameter ratios for small fresh lunar craters, and would suggest that none of the impact structures considered excavated below the level of the crust/mantle boundary. Mare basalt thicknesses for the structures considered range from 1.8 km for Orientale to 4.9 km for Serenitatis.
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