Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p41a..05y&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #P41A-05
Physics
5420 Impact Phenomena (Includes Cratering), 5470 Surface Materials And Properties, 5499 General Or Miscellaneous, 6225 Mars
Scientific paper
High resolution Mars Orbiter Laser Altimeter (MOLA) data can be used to determine the population of visible and buried basins in the ancient Noachian region of Hesperia Planum, Mars. A very similar total population of basins can be seen underlying the younger smooth plains of Hesperia Planum, suggesting the ancient Noachian terrain continues beneath it. Assuming rim heights and crater depths among craters of similar diameter were similar before being covered by younger material, one can determine the thickness of the superimposed Hesperian age material. Assuming all craters of the same size in the Noachian had a similar amount of infill when the Hesperian Plains were deposited must also be considered. The difference between the crater depth seen in visible Noachian craters, and depth seen of buried presumed Noachian craters in Hesperia Planum should equal the thickness of the Hesperian deposits. The crater rim and depth characteristics determined by Garvin (Garvin et. al. 2000, 2002) can be used to calculate the sediment in the Noachian craters, in both visible craters and of the buried craters of Hesperia Planum. The difference between the crater depth as calculated from Garvin (Garvin et. al. 2000; 2002) and the visible crater depth as seen with MOLA in the ridged plains should equal the total amount of sediment deposited in the crater since it was formed. We note a very obvious lack of buried basins immediately surrounding Tyrrhena Patera, but an increasing population as the distance from the volcano increases. The close proximity of Tyrrhena Patera to the study region gives a good source for much of the fresh sediment, and a reasonable explanation for the population dropoff.
Frey Herbert V.
Roark James H.
Sakimoto Susan E.
Yoburn J. B.
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