Effects of lava flows on lunar crater populations

Physics

Scientific paper

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Lava, Lunar Craters, Lunar Evolution, Apollo Flights, Frequency Distribution, Lunar Landing Sites, Lunar Maria, Meteorite Craters, Physical Properties, Size (Dimensions)

Scientific paper

It is shown that endogenic lava-flow processes can be identified by their characteristic effects on lunar crater-size distributions without necessarily recognizing individual flows on the photographs studied. The thickness of lava flows or a series of flows can be estimated from these crater-size distribution characteristics. The lava-flow histories of the Apollo 11, 12, and 15 landing sites are discussed in detail. The thicknesses of the most recent (3-3.4 billion years ago) flows there and the youngest flows in an area in southwestern Mare Imbrium (3 billion years) are found to range between 30 and 60 m. The subsequent flow episodes at the landing sites showing up in the crater-size distributions can be related to differences in the radiometric ages of the respective lunar rocks.

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