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Title: Chemical variability in mineralized veins observed by ChemCam on the lower slopes of Mount Sharp in Gale crater, Mars

Journal Article · · Icarus
 [1];  [1];  [2];  [3];  [4]; ORCiD logo [2];  [2];  [2]; ORCiD logo [5];  [6];  [1]; ORCiD logo [2];  [2]; ORCiD logo [7]
  1. Univ. de Nantes, Nantes (France)
  2. Univ. de Toulouse, Toulouse (France)
  3. Johns Hopkins Univ. Applied Physics Lab., Laurel, MD (United States)
  4. Univ. de Toulouse, Toulouse (France); California Inst. of Technology (CalTech), Pasadena, CA (United States)
  5. Univ. de Toulouse, Toulouse (France); Univ. Lyon, Villeurbanne (France)
  6. UC Davis Earth and Planetary Science, Davis, CA (United States)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

ChemCam has observed a wide range of diagenetic features along the Curiosity rover traverse including pervasive Ca-sulfate veins. Observations by multiple instruments on Curiosity indicate that these veins are hydrated, formed during diagenetic fluid event(s). In this study, we delve into the chemical variability in these Ca-sulfate bearing veins and have identified two subsets in the Murray formation with enrichments in Fe and Fe + Mg. These chemical trends do not reflect a sampling mixture with the surrounding host rock but likely indicates the presence of authigenic phases formed during the emplacement of these veins. Based on passive reflectance spectral analysis and correlation with other elements, Fe3+ oxides and/or sulfates are proposed to account for the Fe-rich observations in the vicinity of the Naukluft Plateau whereas the Fe + Mg trend is also observed in adjacent dark-toned features with elevated Mn and P near the Old Soaker outcrop. In conclusion, the specific localization of these observations in the Gale stratigraphy implies changing pH and redox conditions in the groundwater at the time of formation of these veins, from oxidizing and likely more acidic near the Naukluft Plateau to more reducing conditions in the upper part of the Murray formation.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1508554
Report Number(s):
LA-UR-18-28854
Journal Information:
Icarus, Vol. 311, Issue C; ISSN 0019-1035
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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