Crater frequencies on lava-covered areas related to the moon's thermal history

Physics

Scientific paper

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Lava, Lunar Craters, Lunar Evolution, Lunar Maria, Lunar Photography, Apollo Flights, Cratering, Frequency Distribution, Lunar Orbiter, Lunar Surface, Lunar Temperature, Radioactive Age Determination, Tables (Data)

Scientific paper

Making use of Orbiter and Apollo photographs, frequency counts of craters down to 2 km diam as indicators of the relative ages of lunar features, have been made on 264 areas, including 15 terrae, 27 recognized maria, 174 flat-floored craters and 48 lave-covered areas with indefinite boundaries designated as 'marets'. The range of crater frequencies on the marets, together with their wide distribution over the lunar surface, suggest lava migrations to the surface within autonomous domains each with its own chronology, covering an extensive period of lunar history. The close association of marets with flat-floored craters provides a reasonable origin for the floor material of these latter objects. The lava migrations associated with the marets suggest that internal heating may be a more important factor in the origin of lunar surface features than had formerly been supposed.

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