Flows of impact melt at lunar crater

Journal of Research of the U.S. Geological Survey
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Abstract

Lavalike materials that were emplaced in a fluid state occur in and around lunar impact craters whose diameters range from 3 km to more than 200 km and whose ages span a time interval of at least 3.5 b.y. Evidence of fluid emplacement includes flow lobes and leveed channels, a veneer mantling rough crater topography, level-surfaced pools, and complex contraction fissuring. The distribution of the lavalike deposits conforms to asymmetries of other ejecta from the same craters, and the material is concentrated downrange to distances as great as a crater radius. The character and distribution of the lavalike materials support the idea that they formed by impact melting rather than by volcanism. Returned samples indicate that materials with appropriate physical characteristics are generated by partial melting of feldspathic rocks by impact. The geologic evidence at lunar craters suggests that there is more melt rock in and near the craters than is predicted by experiment and theory.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Flows of impact melt at lunar crater
Series title Journal of Research of the U.S. Geological Survey
Volume 3
Issue 2
Year Published 1975
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Description 15 p.
First page 237
Last page 251
Online Only (Y/N) N
Additional Online Files (Y/N) N
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