Physics – Geophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept...80l&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 80-81 (SEE N92-10728 01-91)
Physics
Geophysics
Geochronology, Mars Surface, Planetary Evolution, Structural Properties (Geology), Tectonics, Erosion, Floors, Linear Arrays, Morphology, Plateaus, Topography, Troughs
Scientific paper
The origin of the Valles Marineris remains controversial. Erosional, tectonic, and hybrid processes have been proposed. To clarify these contradictions, the widths and depths of pit chains and troughs were compared and it was found that the features do not form a continuum. Rather, results are consistent with the hypothesis that pit chains formed by surficial collapse and troughs by deeper seated and coherent failure. All pit chains and linear depressions in the Valles Marineris region were classified by inspection into six morphologic categories: pit chains (linear arrays of small pits); floored chains (arrays of pit chains having flat or hummocky floors); scalloped troughs (wider linear depressions with scalloped wall segments); narrow troughs (depressions of intermediate width with straight wall segments); wide troughs (broad, linear depressions); and chaotic troughs (more irregular depressions displaying some channel morphologies). Topographic profiles were drawn across the classified depressions and the erosional width was determined between plateau margins along with the depth from the surrounding plateau level to the deepest part.
Balser R. A.
Bertolini L. M.
Lucchitta Baerbel Koesters
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