Geomorphic evolution of the Martian highlands through ancient fluvial processes

Details Geomorphic evolution of the Martian highlands through ancient fluvial processes Geomorphic evolution of the Martian highlands through ancient fluvial processes

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3453c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E2, p. 3453-3468.

Mathematics

Logic

137

Geomorphology, Highlands, Mars Craters, Mars Surface, Planetary Geology, Water Erosion, Planetary Evolution, Planetology, Mars, Morphology, Evolution, Highlands, Craters, Erosion, Elevation, History, Ejecta, Size, Distribution, Chronology, Volatiles, Cycle, Precipitation, Flow, Resurfacing, Surface, Features, Impact Craters, Flooding, Sapping, Groundwater, Outgassing, Seepage, Hydrology

Scientific paper

The evolution of crater degradation in the Martian highlands based on variations in crater morphology is traced. The timing of this process related to geology, elevation, and latitude is examined, the nature of fluvial resurfacing is studied, and the approximate rate of denudation is determined. The obtained data make it possible to understand the early geologic history of Mars, the interaction between the atmosphere and surface processes through time, and the nature of highland surface materials. Degradation was found to begin with sheet-flooding and the formation of runoff channels in both the interior and exterior of the craters. Progressive stripping of the ejecta material led to craters with incised rims. Erosion and infilling led to flat doors. With time, continued erosion removed ejecta and rim materials completely. Timing of degradation based on cumulative size-frequency distribution curves of highland crater population indicates that the process ceased completely in the late Hesperian. Global average denudation rates were found to be between 0.0001 and 0.005 mm/yr.

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