Abundances and implications of volatile-bearing species from evolved gas analysis of the Rocknest aeolian deposit, Gale Crater, Mars

被引:81
作者
Archer, Paul Douglas, Jr. [1 ]
Franz, Heather B. [2 ]
Sutter, Brad [1 ]
Arevalo, Ricardo D., Jr. [3 ]
Coll, Patrice [4 ,5 ]
Eigenbrode, Jennifer L. [3 ]
Glavin, Daniel P. [3 ]
Jones, John J. [1 ]
Leshin, Laurie A. [6 ,7 ]
Mahaffy, Paul R. [3 ]
McAdam, Amy C. [3 ]
McKay, Christopher P. [8 ]
Ming, Douglas W. [1 ]
Morris, Richard V. [1 ]
Navarro-Gonzalez, Rafael [9 ]
Niles, Paul B. [1 ]
Pavlov, Alex [3 ]
Squyres, Steven W. [10 ]
Stern, Jennifer C. [3 ]
Steele, Andrew [11 ]
Wray, James J. [12 ]
机构
[1] NASA, Lyndon B Johnson Space Ctr, Houston, TX 77058 USA
[2] NASA, Goddard Space Flight Ctr, Ctr Res & Explorat Space Sci & Technol, Greenbelt, MD 20771 USA
[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[4] Univ Paris 07, Univ Paris Est Creteil, LISA, Creteil, France
[5] Hop Henri Mondor, CNRS, F-94010 Creteil, France
[6] Rensselaer Polytech Inst, Dept Earth & Environm Sci, Troy, NY USA
[7] Rensselaer Polytech Inst, Sch Sci, Troy, NY USA
[8] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA
[9] Univ Nacl Autonoma Mexico, Lab Quim Plasmas & Estudios Planetarios, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico
[10] Cornell Univ, Ithaca, NY USA
[11] Carnegie Inst Sci, Geophys Lab, Washington, DC USA
[12] Georgia Inst Technol, Atlanta, GA 30332 USA
关键词
MSL; Mars; Soil Mineralogy; Evolved Gas Analysis; SAM; volatiles; MARTIAN ATMOSPHERE; CALCIUM-CARBONATE; ELECTRON-IMPACT; CROSS-SECTIONS; GUSEV CRATER; PHOENIX; DECOMPOSITION; TEMPERATURE; IONIZATION; PERCHLORATE;
D O I
10.1002/2013JE004493
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The Sample Analysis at Mars (SAM) instrument on the Mars Science Laboratory (MSL) rover Curiosity detected evolved gases during thermal analysis of soil samples from the Rocknest aeolian deposit in Gale Crater. Major species detected (in order of decreasing molar abundance) were H2O, SO2, CO2, and O-2, all at the mu mol level, with HCl, H2S, NH3, NO, and HCN present at the tens to hundreds of nmol level. We compute weight % numbers for the major gases evolved by assuming a likely source and calculate abundances between 0.5 and 3 wt.%. The evolution of these gases implies the presence of both oxidized (perchlorates) and reduced (sulfides or H-bearing) species as well as minerals formed under alkaline (carbonates) and possibly acidic (sulfates) conditions. Possible source phases in the Rocknest material are hydrated amorphous material, minor clay minerals, and hydrated perchlorate salts (all potential H2O sources), carbonates (CO2), perchlorates (O-2 and HCl), and potential N-bearing materials (e.g., Martian nitrates, terrestrial or Martian nitrogenated organics, ammonium salts) that evolve NH3, NO, and/or HCN. We conclude that Rocknest materials are a physical mixture in chemical disequilibrium, consistent with aeolian mixing, and that although weathering is not extensive, it may be ongoing even under current Martian surface conditions.
引用
收藏
页码:237 / 254
页数:18
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