Light-toned deposits contain only a subset of possible sedimentary deposits (Grotzinger and Milliken 2012) on Mars, and their description as a unique class of deposits is based on subjective and sometimes unreliable parameters.
The name “light-toned deposit” is derived from the light-toned appearance of these deposits in processed, contrast-enhanced grayscale images. They are light orange, reddish, or brownish in true color. The name reflects the albedo of LTD relative to their surroundings. The range of surface albedo on Mars is between 0.35 and 0.25 (Grotzinger and Milliken 2012). Quantitative albedo cannot be extracted from MOC images. Viking observations suggest that light-toned units have albedos of >0.22 and...
KeywordsDust Sulfide Explosive
- Chapman MG, Smellie JL (2007) Mars interior layered deposits and terrestrial sub-ice volcanoes compared: observations and interpretations of similar geomorphic characteristics. In: Chapman M (ed) The geology of Mars: evidence from Earth-based analogs. Cambridge University Press, New York, pp 178–211CrossRefGoogle Scholar
- Chuang FC, Weitz CM, Dobrea EN (2008) Light-toned layered deposits within craters in Arabia Terra. Lunar Planet Sci Conf XXXIX, abstract #2074, HoustonGoogle Scholar
- Fueten F, Flahaut J, Le Deit L, Stesky R, Hauber E, Gwinner K (2011) Interior layered deposits within a perched basin, southern Coprates Chasma, Mars: evidence for their formation, alteration, and erosion. J Geophys Res 116, E02003. doi:10.1029/2010JE003695Google Scholar
- Grotzinger JP, Milliken RE (2012) The sedimentary rock record of Mars: distribution, origins, and global stratigraphy. In: Grotzinger JP, Milliken RE (eds) Sedimentary geology of Mars. SEPM special publication 102. Society for Sedimentary Geology, Tulsa, pp 1–48Google Scholar
- Malin MC, Edgett KS (2001) Mars Global Surveyor Mars Orbiter Camera: Interplanetary cruise through primary mission J Geophys Res 106(E10):23429–23570. doi:10.1029/2000JE001455Google Scholar
- McCauley JF (1974) White rock: a Martian Enigma: Mars as viewed by Mariner 9. NASA Spec Publ 329:170–171Google Scholar
- Milliken R, Grotzinger J, Beyer R, Murchie S, McEwen A, and the CRISM Science Team (2007) Evidence for salt tectonics in Valles Marineris, Mars. In: 7th international Mars conference, Pasadena, 9–13 July, #3383Google Scholar
- Rossi AP, Neukum G, Pondrelli M, van Gasselt S, Zegers T, Hauber E, Chicarro A, Foing B (2008) Large-scale spring deposits on Mars? J Geophys Res 113, E08016. doi:10.1029/2007JE003062Google Scholar