Alphonsus crater - Floor fracture and dark-mantle deposit distribution from new 3.0-cm radar images

Details Alphonsus crater - Floor fracture and dark-mantle deposit distribution from new 3.0-cm radar images Alphonsus crater - Floor fracture and dark-mantle deposit distribution from new 3.0-cm radar images

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.2137z&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Nov. 1991, p. 2137-2140.

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1

Circular Polarization, Crustal Fractures, Lunar Craters, Lunar Surface, Radar Imagery, Apollo 16 Flight, Lunar Mantle, Lunar Photography, Surface Roughness

Scientific paper

The lunar crater Alphonsus is characterized by numerous fractures or graben, and by endogenic dark-halo craters. Existing maps of fractures from analysis of lunar photography may be biased by the east-west solar illumination. This paper presents new high-resolution, dual-polarization 3.0-cm wavelength radar images of Alphonsus with radar illumination from northerly directions, and uses these data to better map the locations of both the graben and a variety of dark-mantle deposits. The distribution of fractures, and several graben which cut the crater floor and central ridge, are cited as possible evidence for simultaneous, post-Imbrium uplift of both structures. Some of the endogenic dark halo deposits are more extensive in depolarized radar images than in photographs; these extensions are attributed in some cases to more distant emplacement of pyroclastic material, and in others to fortuitous connections with smoother, less cratered portions of the Alphonsus floor.

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