Mathematics – Logic
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm...p22a04p&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #P22A-04
Mathematics
Logic
5420 Impact Phenomena (Includes Cratering), 5475 Tectonics (8149)
Scientific paper
Free-air anomaly components of the Lunar Prospector gravity model (LP75G) that are spectrally correlated at 100-km altitude with the gravity effects of the Clementine terrain model (GLTM-2) were investigated for insight on the crustal ring and transient cavity attributes of multi-ring basins. Inversion of the terrain-correlated anomalies inferred incipient radial adjustments of the Moho that equilibrate the basin topography assuming the lunar crust was mainly compensated by its thickness variations. These adjustments revealed well defined concentric zones of maxima and minima about the central basins that are strongly correlated with photogeologically inferred basin rings. In addition, the innermost zero contour of the radial adjustments provides an effective estimate for the diameter of the transient cavity. The inferred transient cavity diameters correlated negatively with crustal thickness for basins with superisostatic mantle plugs, and positively with the relative ages of the nearside basins. On the farside, the analysis suggested that superisostatic mantle plugs developed in thinner crust up to thicknesses of about 30 km, whereas in thicker crust mantle plugs developed only to subisostatic levels. For the nearside, mass balance calculations between the equilibrium mantle plug and excavated basin materials supported the proportional scaling relation of roughly 0.1 for the excavation depth-to-diameter ratio of the transient cavity that previous photogeologic studies had obtained. However, this proportionality may overestimate excavation depths by 28% and 37%, respectively for the Serenitatis and Imbrium basins with possibly atypical nearside crustal properties. Shallow excavation depths also were inferred for nearside and farside basins lacking apparent mare flooding.
Potts Laramie V.
von Frese Ralph R.
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