Multi-ring basins and mascons

Details Multi-ring basins and mascons Multi-ring basins and mascons

Jul 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974plug.nasa..253h&link_type=abstract

In NASA. Ames Res. Center A Primer in Lunar Geology p 253-274 (SEE N75-13730 04-91)

Mathematics

Logic

Lunar Geology, Lunar Surface, Mascons, Structural Basins, Lunar Evolution, Lunar Maps, Lunar Maria, Lunar Orbiter, Lunar Topography, Stratigraphy

Scientific paper

Large positive gravity anomalies characterize all obvious mare filled circular basins on the near side. The gravity field was identified from anomalous accelerations of lunar orbiters. The positive free air anomalies represent mass concentrations nicknamed mascons. Most mascons seem best explained as thin discs of dense mare basalt. Recent geologic mapping of the lunar limbs and far side, together with Apollo results, appear to confirm that multi-ring basins account for most or all pre-mare regional deposits and structures expressed in the lunar landscape. Highland deposits of plains, furrowed and pitted terrain, and various hills, domes, and craters that were interpreted before the Apollo missions as volcanic can now be interpreted as basin-related. A province map of the whole moon shows that the relatively young Orientale and Imbrium basins imprinted and rejuvenated much of the moon's surface. Several nearly obliterated basins have been discovered recently, including a deep one on the far side that is as wide as the moon's radius. The presence of these ancient basins suggests that the surface is effectively saturated by basins and that many others were completely destroyed by later impacts.

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