Paul B. Niles

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Carbonates are generally products of aqueous processes and may hold important clues about the history of liquid water on the surface of Mars. Calcium carbonate (approximately 3 to 5 weight percent) has been identified in the soils around the Phoenix landing site by scanning calorimetry showing an endothermic transition beginning around 725 degrees C(More)
H2O, CO2, SO2, O2, H2, H2S, HCl, chlorinated hydrocarbons, NO, and other trace gases were evolved during pyrolysis of two mudstone samples acquired by the Curiosity rover at Yellowknife Bay within Gale crater, Mars. H2O/OH-bearing phases included 2:1 phyllosilicate(s), bassanite, akaganeite, and amorphous materials. Thermal decomposition of carbonates and(More)
Ongoing research on martian meteorites and a new set of observations of carbonate minerals provided by an unprecedented series of robotic missions to Mars in the past 15 years help define new constraints on the history of martian climate with important crossP.B. Niles ( ) · R. Morris Astromaterials Research and Exploration Science, NASA Johnson Space(More)
Carbon dioxide is a primary component of the martian atmosphere and reacts readily with water and silicate rocks. Thus, the stable isotopic composition of CO2 can reveal much about the history of volatiles on the planet. The Mars Phoenix spacecraft measurements of carbon isotopes [referenced to the Vienna Pee Dee belemnite (VPDB)] [delta13C(VPDB) = -2.5 +/-(More)
Samples from the Rocknest aeolian deposit were heated to ~835°C under helium flow and evolved gases analyzed by Curiosity's Sample Analysis at Mars instrument suite. H2O, SO2, CO2, and O2 were the major gases released. Water abundance (1.5 to 3 weight percent) and release temperature suggest that H2O is bound within an amorphous component of the sample.(More)
Stable isotope ratios of H, C, and O are powerful indicators of a wide variety of planetary geophysical processes, and for Mars they reveal the record of loss of its atmosphere and subsequent interactions with its surface such as carbonate formation. We report in situ measurements of the isotopic ratios of D/H and (18)O/(16)O in water and (13)C/(12)C,(More)
PERCHLORATE SALTS: IMPLICATIONS FOR ORGANICS AT THE MARS PHOENIX SCOUT LANDING SITE. D. W. Ming, H. V. Lauer, Jr., P. D. Archer, Jr., B. Sutter, D. C. Golden, R. V. Morris, P. B. Niles, and W. V. Boynton; NASA Johnson Space Center, Houston, TX 77058 (, ESCG/Barrios Tech., Houston, TX, Lunar and Planetary Laboratory, University of(More)
The primary objective of NASA's Mars Science Laboratory (MSL) mission, which will launch in 2011, is to characterize the habitability of a site on Mars through detailed analyses of the composition and geological context of surface materials. Within the framework of established mission goals, we have evaluated the value of a possible landing site in the(More)
Ming, B. Sutter, R. E. Arvidson, J Hoffman, P.B. Niles, P. Smith and the Phoenix Science Team 1 Lunar and Planetary Laboratory, University of Arizona, Tucson AZ 85721, 2 NASA Johnson Space Center, Houston TX 77058, 3 Jacobs/ESCG, Houston TX , 4 Department of Earth and Planetary Sciences, Washington University, Saint Louis MO 63130, 5 Department of Physics,(More)