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Title: Observation of > 5 wt % zinc at the Kimberley outcrop, Gale crater, Mars

Zinc-enriched targets have been detected at the Kimberley formation, Gale crater, Mars, using the Chemistry Camera (ChemCam) instrument. The Zn content is analyzed with a univariate calibration based on the 481.2 nm emission line. The limit of quantification for ZnO is 3 wt % (at 95% confidence level) and 1 wt % (at 68% confidence level). The limit of detection is shown to be around 0.5 wt %. As of sol 950, 12 targets on Mars present high ZnO content ranging from 1.0 wt % to 8.4 wt % (Yarrada, sol 628). Those Zn-enriched targets are almost entirely located at the Dillinger member of the Kimberley formation, where high Mn and alkali contents were also detected, probably in different phases. Zn enrichment does not depend on the textures of the rocks (coarse-grained sandstones, pebbly conglomerates, and resistant fins). The lack of sulfur enhancement suggests that Zn is not present in the sphalerite phase. Zn appears somewhat correlated with Na 2O and the ChemCam hydration index, suggesting that it could be in an amorphous clay phase (such as sauconite). On Earth, such an enrichment would be consistent with a supergene alteration of a sphalerite gossan cap in a primary siliciclastic bedrockmore » or a possible hypogene nonsulfide zinc deposition where Zn, Fe, Mn would have been transported in a reduced sulfur-poor fluid and precipitated rapidly in the form of oxides.« less
Authors:
 [1] ; ORCiD logo [2] ;  [1] ;  [1] ; ORCiD logo [2] ; ORCiD logo [2] ;  [3] ;  [3] ;  [1] ;  [1] ;  [4] ;  [5] ;  [5] ;  [6] ;  [7] ;  [8] ;  [3] ;  [3] ;  [4] ;  [1] more »;  [5] « less
  1. IRAP, OMP, CNRS/UPS, Toulouse (France)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of Nantes (France). LPGNantes
  4. Univ. of Western Ontario, London, ON (Canada)
  5. California Inst. of Technology (CalTech), La Canada Flintridge, CA (United States). Jet Propulsion Lab.
  6. Lorraine Univ., Vandoevre (France). GeoRessources
  7. Max Planck Inst. für Sonnensystemforschung, Gottingen (Germany)
  8. Johns Hopkins Univ., Laurel, MD (United States). Applied Physics Lab.
Publication Date:
Report Number(s):
LA-UR-16-28649
Journal ID: ISSN 2169-9097
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Planets
Additional Journal Information:
Journal Volume: 121; Journal Issue: 3; Journal ID: ISSN 2169-9097
Publisher:
American Geophysical Union
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
National Aeronautic and Space Administration (NASA); USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Planetary Sciences
OSTI Identifier:
1369171