Shallow icy decollements on Mars - Rheological evidence, preliminary results

Details Shallow icy decollements on Mars - Rheological evidence, preliminary results Shallow icy decollements on Mars - Rheological evidence, preliminary results

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..863m&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 863.

Mathematics

Logic

Mars Surface, Rheology, Topography, Ice, Strain Rate, Porosity

Scientific paper

The wrinkle ridges of Mars are long and narrow positive topographies. Structural evidence suggests that these structures are bounded by thrusts rooted on a shallow decollement level. This decollement level is located inside the ice-rich megaregolith. In order to test the mechanical contribution of ice on the occurrence of decollement level, rheological tests have been done on samples equivalent to the Martian megaregolith in Martian thermodynamical conditions. Applied physical parameters are typical from the underground of Mars: 5 to 25 C and 5 to 30 MPa of lithostatic pressure. The sample of ground ice simulating the ice megaregolith mixing is composed by a porous granular medium (sand or silt) saturated by water ice. Porosity is take between 20 and 50 percent of the total volume depending on granulometry. We observed that (1) the mixing creeps slower than pure ice, and (2) the effect of confining pressure is important. This behavior is due to the development of microcracking, which does not develop under higher confining pressure. Taking into account models of temperature, porosity, and pressure the implications of these results are summarized in a strength profile of the upper Martian crust that shows the possibility of ice-rich ductile levels.

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