期刊
ICARUS
卷 200, 期 2, 页码 463-467出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.icarus.2008.12.006
关键词
Mars, surface; Mineralogy
资金
- International Space Science Institute Bern, Switzerland
- NASA Mars Fundamental Research Program
- NASA Mars Exploration Rover Project
- NASA Mars Reconnaissance Orbiter CRISM Program
- NASA CRISM-OMEGA Collaboration
- NASA Johnson Space Center
The recent detection of up to similar to 10 wt% water-equivalent H heterogeneously distributed in the upper meter of the equatorial regions of the martian surface and the presence of the 3-mu m hydrations feature across the entire planet raises the question whether martian surficial dust can account for this water-equivalent H. We have investigated the H2O and CO2 adsorption properties of palagonitic dust (<5 mu m size fraction of phyllosilicate-poor palagonitic tephra HWMK919) as a martian dust analog and two smectites under simulated martian equatorial surface conditions. Our results show that the palagonitic dust, which contains hydrated and hydroxylated volcanic glass of basaltic composition, accommodates significantly more H2O under comparable humidity and temperature conditions than do the smectites nontronite and montmorillonite. (C) 2008 Elsevier Inc. All rights reserved.
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