Physics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9517289b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Oct. 10, 1990, p. 17289-17308.
Physics
17
Mars Craters, Mars Surface, Mars Volcanoes, Orography, Topography, Geomorphology, Lava, Mars Environment, Planetary Mapping
Scientific paper
A valley genesis model of the southern Aeolis Quadrangle, eastern Mars, is proposed. In response to widespread effusive volcanism in interstratified, ice-reach terrains, local subsidence occurred along fractures/faults, and produced scarps that intersected local aquifers. Heated spring discharges issuing from these scarps may have carved the valleys through a combination of downvalley water, ice, and debris flows, and headward erosion along stratal discontinuities and individual conduit faults and fractures. Fifty-six asymmetric scarps or ridges that are probable thrust faults are mapped. The faults exhibit an orientation vector mean of N 63 deg W +/- 11 deg and they transect the lava plains and the older plateau sequence units. The vector mean for the 264 valleys mapped is N 48 deg W +/- 12 deg, with a larger dispersion about the mean. The similar orientations displayed by thrust faults and valley axes suggest that valley locations are partly controlled by preexisting thrust faults and fracture systems.
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