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Title:
Ganges Mensa and other light-toned outcrops in Ganges Chasma
Authors:
Beyer, R. A.
Affiliation:
AA(NASA Ames Research Center, MS 245-3, Moffett Field, CA 94035 United States ; )
Publication:
American Geophysical Union, Fall Meeting 2006, abstract #P23C-0065
Publication Date:
12/2006
Origin:
AGU
AGU Keywords:
5415 Erosion and weathering, 5464 Remote sensing, 5470 Surface materials and properties
Abstract Copyright:
(c) 2006: American Geophysical Union
Bibliographic Code:
2006AGUFM.P23C0065B

Abstract

Ganges Mensa is the single large mesa within Ganges Chasma, standing over 4 km above the chasma floor. It displays a variety of lithologies in its layered stack. Its lower flanks consist of light-toned rock units which show a very low crater retention age. Observations of the mensa show that this low crater retention age indicates a susceptibility to erosion instead of a truly young age. There is good evidence that Ganges Mensa was once much larger, but has shrunk considerably in size due to erosion of this basal unit. Strewn about Ganges Chasma there are a number of smaller mounds of light-toned material that have very similar morphologies and OMEGA data indicate that some of them have a kieserite spectral signature, similar to the kieserite signature displayed by the light-toned units at the base of Ganges Mensa. This study examines these mounds and the relationships between them and Ganges Mensa, including the implications of the kieserite spectral signature. All of these data continue to contribute to discriminating between various origin hypotheses for Ganges Mensa and the light-toned units within Ganges Chasma.
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