Physics – Geophysics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...48..393w&link_type=abstract
Icarus, vol. 48, Dec. 1981, p. 393-427.
Physics
Geophysics
6
Lunar Crust, Lunar Evolution, Structural Basins, Apollo 16 Flight, Basalt, Chemical Composition, Ejecta, Geochronology, Lunar Craters, Lunar Geology, Lunar Maria, Lunar Topography, Selenology, Moon, Evolution, Nectaris, Mare, Ringed Features, Basins, Impacts, Maps, Apollo 16 Mission, Landing Sites, Samples, Lunar, Ejecta, Composition, Age, Eruptions, Volcanism, Basalts, Lithosphere, Structure, Morphology, Diagrams, Formation, Crust, Plains, Deposits, Photographs, Terrain, Topography, Craters
Scientific paper
The paper begins by discussing the pre-Nectaris crust, the formation of the basin, its age and its geophysics. The pre-mare basalt deposits are categorized into smooth plains deposits, cratered and patterned plains, knobby terrain, and massifs, and the structure, chemical composition, and probable origin of these are discussed. Alternative scenarios for the formation of the plains are that they consist of impact melt ejecta, ejecta overlying smoothed-out preexisting topographic material, or ejecta overlying extrusive deposits. The mare deposits are assessed in terms of their composition, basalt ages and thickness, and eruption styles. A probable age of 3.6 billion years for the basalts is given. The tectonics of mare ridges and fractures and floor-fractured craters are gone into. Post-mare cratering is also discussed. It is concluded that the morphology of multiring basins is strongly dependent on lithosphere thickness.
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