Physics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9417333w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Dec. 10, 1989, p. 17333-17357.
Physics
45
Impact Damage, Mars Craters, Mars Volcanoes, Plastic Deformation, Structural Basins, Highlands, Planetary Structure, Tectonics
Scientific paper
The distribution and age of early volcanic and tectonic features surrounding the Hellas and Isidis impact basins are shown to fit a four-stage sequence. First, concentric 'canyons' form outside the basin boundary scarp at or near the time of basin formation, followed shortly thereafter by radial troughs extending beyond the boundary scarp. After a hiatus, concentric graben develop inside the basin within the massif ring. Finally, soon after graben formation, widespread volcanic plains are emplaced between the massif ring and the boundary scarp to one side of the basin. Three models of basin-centered deformation are compared to these observed deformation events: elastic flexure due to loading, elastic flexure due to uplift, and impact fracture.
Schultz Peter H.
Wichman Robert W.
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