Mathematics – Logic
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.8333f&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Oct. 10, 1983, p. 8333-8344.
Mathematics
Logic
38
Mars Surface, Planetary Geology, Ring Structures, Volcanoes, Corrugating, Geological Faults, Gravitational Effects, Morphology, Mars, Mountains, Olympus Mons, Features, Aureole, Formation, Structure, Gravity Effects, Observations, Morphology, Erosion, Geometry, Deposits, Emplacement, Hypotheses, Flows, Characteristics, Stress, Topography, Terrain, Volcanoes, Lava, Eruptions, Volume
Scientific paper
New observations on details of the aureole and on its relationship to the volcano are presented. It is contended that the pyroclastic hypothesis advanced by Morris (1982) is untenable. The gravitational sliding hypothesis put forward in different forms by Lopes et al., (1980) and Harris (1977) is analyzed, and the suggestion is made that the aureole deposits may have been emplaced as large sheets by gravitational spreading from the ancestral Olympus Mons volcano. The stratigraphy and nomenclature for the aureole lobes used by Morris and Dwornik (1978) are employed. The gravitational spreading mechanism proposed involves imbricate thrusting in distal regions, analogous to terrestrial thrust sheets. It is noted that corrugations in the aureole developed by erosion along imbricate or listric faults and that basal shear stresses on the decoupling surface may have been of the order of 10 to the 6th Pa. Whereas the nature of the decoupling surfaces in the proximal regions is uncertain, it is thought likely to have been the topographic surface in distal parts.
Francis Peter W.
Wadge Geoff
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