Physics – Geophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..264l&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 264-265 (SEE N87-23341 16-91)
Physics
Geophysics
3
Dunes, Dust, Geomorphology, Mars Craters, Mars Surface, Planetary Geology, Sands, Wind Effects, Accumulations, Comparison, Earth Surface, Viking Orbiter Spacecraft
Scientific paper
Viking Orbiter images of intracrater dunefields in the Noachis Terra region were examined in order to study the morphology of these landforms and to assess their relationship to local geological settings. The sizes of the dunefields range from 40 to 3600 sq km and vary directly with crater size. Preliminary studies reveal dunefields of two varieties. The most common type is composed of massed straight to slightly wavy crescentic dunes similar to those described by Breed. Dunefields of this type occupy more than 20% of the area of the crater floor, with the dunefield margins often marked by a large dune wall or rampart. Dune spacing ranges between 0.7 and 1.2 km. The second type of dune accumulation consists of clusters of large, widely spaced straight or curved ridges, which often intersect to create rectilinear patterns. Dunes are typically spaced 1.6 to 4 km apart. Earth terrestrial analogs for these dunes are discussed.
Greeley Ronald
Lancaster Nick
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