Mars' ``White Rock'' feature lacks evidence of an aqueous origin: Results from Mars Global Surveyor

Details Mars' ``White Rock'' feature lacks evidence of an aqueous origin: Results from Mars Global Surveyor Mars' ``White Rock'' feature lacks evidence of an aqueous origin: Results from Mars Global Surveyor

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10623921r&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue E10, p. 23921-23928

Other

25

Planetology: Solid Surface Planets: Composition, Planetology: Solid Surface Planets: Physical Properties Of Materials, Planetology: Solid Surface Planets: Remote Sensing, Planetology: Solid Surface Planets: Surface Materials And Properties

Scientific paper

The ``White Rock'' feature on Mars has long been viewed as a type example for a Martian playa largely because of its apparent high albedo along with its location in a topographic basin (a crater). Data from the Mars Global Surveyor Thermal Emission Spectrometer (TES) demonstrate that White Rock is not anomalously bright relative to other Martian bright regions, reducing the significance of its albedo and weakening the analogy to terrestrial playas. Its thermal inertia value indicates that it is not mantled by a layer of loose dust, nor is it bedrock. The thermal infrared spectrum of White Rock shows no obvious features of carbonates or sulfates and is, in fact, spectrally flat. Images from the Mars Orbiter Camera show that the White Rock massifs are consolidated enough to retain slopes and allow the passage of saltating grains over their surfaces. Material appears to be shed from the massifs and is concentrated at the crests of nearby bedforms. One explanation for these observations is that White Rock is an eroded accumulation of compacted or weakly cemented aeolian sediment.

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