Hellas Planitia, Mars - Site of net dust erosion and implications for the nature of basin floor deposits

Details Hellas Planitia, Mars - Site of net dust erosion and implications for the nature of basin floor deposits Hellas Planitia, Mars - Site of net dust erosion and implications for the nature of basin floor deposits

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1599m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 15, p. 1599-1602.

Mathematics

Logic

12

Dust Storms, Mars (Planet), Soil Erosion, Structural Basins, Topography, Atmospheric Circulation, Computerized Simulation, Deposits, Particle Size Distribution, Remote Sensing

Scientific paper

Hellas Planitia, located within an enclosed basin which includes the lowest topography on Mars, appears to be undergoing net erosion. Dust is removed from the basin. It probably contributes to global dust storms and should leave behind a coarse lag. The particle size distributions and particularly the rock or boulder populations in this lag might be useful for distinguishing between processes which formed the lithologic units that comprise Hellas Planitia. This report concludes that the abundance of rock particles larger than coarse sand is very low. Although this hypothesis awaits confirmation from forthcoming spacecraft data, the origins for Hellas floor deposits favored by this study are indurated volcanic airfall or ancient loess, lacustrine deposits, and some types of volcanic mud flows. The conclusions of this study tend to disfavor such geologic processes as blocky lava flows, glacial deposits (e,g., moraines), or boulder-laden catastrophic flood outwash.

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