Abstract
The tectonics of the Grimaldi area are described and analyzed in detail from high-resolution Lunar Orbiter photographs.
Rille grabens are long and narrow fault zone structures of lunar terra. The polygonal rille graben pattern indicates the importance of lunar internal activity with an adjoining thin lithosphere in the areal tectonics at the time of rille grabening. The graben subsidence developed during tensional bending of this thin terra lithosphere. The en échelon graben offsets indicate the existence of strikeslip movements along the main fault under tensional lithosphere conditions.
In some places mare ridge ranges continue in the direction of the rille graben indicating the connection of these structures to each other as part of the lunar tectonic evolution. The very thin mare lithosphere was affected more easily and over a longer period of time by lunar internal forces. The effect of older structural units is thus less conspicuous within mare areas. Proposed Riedel-shear-like structures indicate a slight shortening and compression of the mare basin lithosphere during movements along lava-covered zones of weakness.
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Raitala, J. Tectonic pattern of the crater Grimaldi region of the Moon. The Moon and the Planets 24, 327–338 (1981). https://doi.org/10.1007/BF00897105
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DOI: https://doi.org/10.1007/BF00897105