Hydrogen Chloride and Sulfur Dioxide Gas Evolutions from the Reaction between Mg Sulfate and NaCl: Implications for the Sample Analysis at the Mars Instrument in Gale Crater, Mars

被引：0
|
作者：
Clark, Joanna V. [1 ]
Sutter, Brad [2 ]
McAdam, Amy C. [3 ]
Knudson, Christine A. [3 ,4 ,5 ]
Casbeer, Patrick [2 ]
Tu, Valerie M. [2 ]
Rampe, Elizabeth B. [6 ]
Ming, Douglas W. [6 ]
Archer, Paul D. [2 ]
Mahaffy, Paul R. [3 ]
Malespin, Charles [3 ]
机构：
[1] NASA, Johnson Space Ctr, Houston, TX 77058 USA
[2] NASA, Johnson Space Ctr, Jacobs, Houston, TX 77058 USA
[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[4] Univ Maryland, College Pk, MD 20742 USA
[5] CRESST II, Greenbelt, MD 20771 USA
[6] NASA, Johnson Space Ctr, Houston, TX 77058 USA
来源：
MINERALS | 2024年 / 14卷 / 03期
关键词：
Sample Analysis at Mars; Curiosity rover; Gale crater; chlorides; sulfates; ROCKNEST AEOLIAN DEPOSIT; MINERALOGY; MUDSTONE; DECOMPOSITION; SANDSTONE; KINETICS; SALTS;
D O I：
10.3390/min14030218
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-Evolved Gas Analyzer (SAM-EGA) on the Curiosity rover detected hydrogen chloride (HCl) and sulfur dioxide (SO2) gas evolutions above 600 degrees C and 700 degrees C, respectively, from several drilled rock and soil samples collected in Gale crater, which have been attributed to NaCl and Mg sulfates. Although NaCl and Mg sulfates do not evolve HCl or SO2 within the SAM temperature range (<similar to 870 degrees C) when analyzed individually, they may evolve these gases at < 870 degrees C and become detectable by SAM-EGA when mixed. This work aims to determine how Mg sulfate and NaCl interact during heating and how that affects evolved HCl and SO2 detection temperatures in SAM-EGA. Solid mixtures of NaCl and kieserite were analyzed using a thermogravimeter/differential scanning calorimeter furnace connected to a quadrupole mass spectrometer, configured to operate under similar conditions as SAM, and using X-ray diffraction of heated powders. NaCl analyzed individually did not evolve HCl; however, NaCl/kieserite mixtures evolved HCl releases with peaks above 600 degrees C. The results suggested that kieserite influenced HCl production from NaCl via two mechanisms: (1) kieserite depressed the melting point of NaCl, making it more reactive with evolved water; and (2) SO2 from kieserite decomposition reacted with NaCl and water (i.e., Hargreaves reaction). Additionally, NaCl catalyzed the thermal decomposition of kieserite, such that the evolved SO2 was within the SAM-EGA temperature range. The results demonstrated that SAM-EGA can detect chlorides and Mg sulfates when mixed due to interactions during heating. These phases can provide information on past climate and mineral formation conditions.
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页数：19
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