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Title:
Red/violet contrast reversal on Mars - Significance for eolian sediments
Authors:
Thomas, P.; Veverka, J.
Affiliation:
AA(Cornell University, Ithaca, NY), AB(Cornell University, Ithaca, NY)
Publication:
Icarus (ISSN 0019-1035), vol. 66, April 1986, p. 39-55. (Icarus Homepage)
Publication Date:
04/1986
Category:
Lunar and Planetary Exploration; Mars
Origin:
STI; LPI [AN-860886%J]
NASA/STI Keywords:
IMAGE CONTRAST, MARS PHOTOGRAPHS, MARS SURFACE, SATELLITE IMAGERY, SEDIMENTS, ALBEDO, DUST STORMS, IMAGE ANALYSIS, IRON OXIDES, PARTICLE SIZE DISTRIBUTION, REVERSING, VIKING ORBITER SPACECRAFT
LPI Keywords:
MARS, ALBEDO, WAVELENGTHS, VIKING MISSIONS, ORBITERS, IMAGERY, COLOR, EOLIAN FEATURES, DEPOSITS, STREAKS, LABORATORY STUDIES, SIMULATIONS, IRON OXIDES, SURFACE, PARTICLES, SIZE, SEDIMENTS, DUST, SALTATION
DOI:
10.1016/0019-1035(86)90005-9
Bibliographic Code:
1986Icar...66...39T

Abstract

Viking Orbiter images of Mars are analyzed to define relationships between the observed contrast reversals (CR) and specific surface features. The link between CR phenomena and surface composition was first detected in contrast comparisons between UV and visible wavelength Mariner 9 data. Viking data, taken through red and violet filters, showed that the CRs occurred only with crater splotches and splotch-related streaks and in bright depositional and dark erosional streaks, both being low-albedo markings presumably caused by eolian forces. The splotch phenomena is confined mainly to the Oxia Palus region, although there are other regions where splotches and streaks commingle. Laboratory tests to mimic the CR characteristics showed that CRs are a common phenomena of different size fractions of iron oxides, e.g., goethite, where particles under 5 microns have been removed. The splotches, including dune formations, are therefore believed to indicate the presence of particles in the 100-800 microns diam range. Finer particles ride on the tops of the dust storms, and are continually removed from the surface by saltation.
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