Biology
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..475g&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 475.
Biology
Mars Craters, Lakes, Volcanoes, Ice, Sedimentary Rocks, Paleobiology, Antarctic Regions, Topography
Scientific paper
Ridges that are generally attributed to volcanic activity may find a different origin in the case of the Gusev crater on Mars. The ridges may be the result of rotary currents in the sub-ice lake as suggested by terrestrial analogs. The characteristic sedimentary deposit morphologies observed on the paleolake bed of the Gusev crater compared to terrestrial Antarctic analogs suggest that they were generated by sublacustrine currents under an ice-covered lake. Antarctic lake analogs may predict the sediment morphologies that can be expected on the crater floor. In the Gusev crater, the tangent entrance of Ma'adim Vallis flows enhanced by the circular topography of the crater is likely to have generated a rotary sub-ice current. As in terrestrial analogs, this rotary current may have transported the fluvial sediment lakeward along the bottom of the crater lake. This rotary current analog model finds observational support with the presence of typical tongue-shaped sedimentary deposits and organized ridge systems.
Cabrol Nathalie A.
Grin Edmon A.
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