Buried mass anomalies along the hemispheric dichotomy in eastern Mars: Implications for the origin and evolution of the dichotomy

Details Buried mass anomalies along the hemispheric dichotomy in eastern Mars: Implications for the origin and evolution of the dichotomy Buried mass anomalies along the hemispheric dichotomy in eastern Mars: Implications for the origin and evolution of the dichotomy

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3222201k&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 22, CiteID L22201

Physics

10

Planetary Sciences: Solid Surface Planets: Gravitational Fields (1221), Planetary Sciences: Solid Surface Planets: Tectonics (8149), Planetary Sciences: Solar System Objects: Mars, Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Tectonophysics: Dynamics: Convection Currents, And Mantle Plumes

Scientific paper

Gravity observations indicate the presence of buried, high-density material along the hemispheric dichotomy in eastern Mars. This material is unrelated to present-day topography and is probably the result of localized thinning of the crust. This thinning may be the result of an epoch of edge-driven convection that occurred shortly after the dichotomy formed. Initiation of edge-driven convection requires that lateral variations in lithospheric structure be created on a timescale that is shorter than the conductive cooling time for the lithosphere, a few tens of million years at most. This timescale cannot be achieved if the dichotomy boundary is created solely by large-scale convective flow. Formation or modification of the boundary by large impact basins such as Utopia can create the required lithospheric structure in a geologic instant. This suggests that large impacts were important in shaping the dichotomy, at least on a regional scale.

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