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Title: Chemical alteration of fine-grained sedimentary rocks at Gale crater

Abstract

From Sol 750 to 1550, the Curiosity rover documented >100 m thick stack of fine-grained sedimentary rocks making up part of the Murray formation, at the base of Mt Sharp, Gale crater. Here, we use data collected by the ChemCam instrument to estimate the level of chemical weathering in these sedimentary rocks. Both the Chemical Index of Alteration (CIA) and the Weathering Index Scale (WIS) indicate a progressive increase in alteration up section, reaching values of CIA of 63 and WIS of 25%. The increase in CIA and WIS values is coupled with a decrease in calcium abundance, suggesting partial dissolution of Ca-bearing minerals (clinopyroxene and plagioclase). Mineralogy from the CheMin X-ray diffraction instrument indicates a decrease in mafic minerals compared with previously analyzed strata and a significant proportion of phyllosilicates consistent with this interpretation. Furthermore, these observations suggest that the sediments were predominantly altered in an open system, before or during their emplacement, contrasting with the rock-dominated conditions inferred in sedimentary deposits analyzed at Yellowknife Bay.

Authors:
 [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [5];  [6]; ORCiD logo [5]; ORCiD logo [7]; ORCiD logo [4]; ORCiD logo [1];  [1];  [4];  [8];  [4]; ORCiD logo [5]; ORCiD logo [9];  [10];  [11]; ORCiD logo [12];  [13] more »; ORCiD logo [14] « less
  1. Univ. de Nantes, Univ. d'Angers, Nantes (France)
  2. Univ. Claude Bernard (France)
  3. Univ. of Tennessee, Knoxville, TN (United States)
  4. Univ. de Toulouse, Toulouse (France)
  5. Univ. of Arizona, Tucson, AZ (United States)
  6. NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States)
  7. Univ. of Copenhagen (Denmark)
  8. Stony Brook Univ., Stony Brook, NY (United States)
  9. Univ. of New Mexico, Albuquerque, NM (United States)
  10. Aerodyne Industries, Houston, TX (United States)
  11. UC Davis Earth and Planetary Science, Davis, CA (United States)
  12. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  13. Northern Arizona Univ., Flagstaff, AZ (United States)
  14. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautic and Space Administration (NASA); USDOE
OSTI Identifier:
1483549
Report Number(s):
LA-UR-18-29015
Journal ID: ISSN 0019-1035
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Icarus
Additional Journal Information:
Journal Name: Icarus; Journal ID: ISSN 0019-1035
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Planetary Sciences

Citation Formats

Mangold, Nicolas, Dehouck, E., Fedo, C., Forni, O., Achilles, C., Bristow, T., Downs, R. T., Frydenvang, J., Gasnault, O., L'Haridon, J., Deit, L. Le, Maurice, S., McLennan, S. M., Meslin, P. -Y., Morrison, S., Newsom, H. E., Rampe, E., Rapin, W., Rivera-Hernandez, F., Salvatore, M., and Wiens, R. C. Chemical alteration of fine-grained sedimentary rocks at Gale crater. United States: N. p., 2018. Web. doi:10.1016/j.icarus.2018.11.004.
Mangold, Nicolas, Dehouck, E., Fedo, C., Forni, O., Achilles, C., Bristow, T., Downs, R. T., Frydenvang, J., Gasnault, O., L'Haridon, J., Deit, L. Le, Maurice, S., McLennan, S. M., Meslin, P. -Y., Morrison, S., Newsom, H. E., Rampe, E., Rapin, W., Rivera-Hernandez, F., Salvatore, M., & Wiens, R. C. Chemical alteration of fine-grained sedimentary rocks at Gale crater. United States. doi:10.1016/j.icarus.2018.11.004.
Mangold, Nicolas, Dehouck, E., Fedo, C., Forni, O., Achilles, C., Bristow, T., Downs, R. T., Frydenvang, J., Gasnault, O., L'Haridon, J., Deit, L. Le, Maurice, S., McLennan, S. M., Meslin, P. -Y., Morrison, S., Newsom, H. E., Rampe, E., Rapin, W., Rivera-Hernandez, F., Salvatore, M., and Wiens, R. C. Sat . "Chemical alteration of fine-grained sedimentary rocks at Gale crater". United States. doi:10.1016/j.icarus.2018.11.004.
@article{osti_1483549,
title = {Chemical alteration of fine-grained sedimentary rocks at Gale crater},
author = {Mangold, Nicolas and Dehouck, E. and Fedo, C. and Forni, O. and Achilles, C. and Bristow, T. and Downs, R. T. and Frydenvang, J. and Gasnault, O. and L'Haridon, J. and Deit, L. Le and Maurice, S. and McLennan, S. M. and Meslin, P. -Y. and Morrison, S. and Newsom, H. E. and Rampe, E. and Rapin, W. and Rivera-Hernandez, F. and Salvatore, M. and Wiens, R. C.},
abstractNote = {From Sol 750 to 1550, the Curiosity rover documented >100 m thick stack of fine-grained sedimentary rocks making up part of the Murray formation, at the base of Mt Sharp, Gale crater. Here, we use data collected by the ChemCam instrument to estimate the level of chemical weathering in these sedimentary rocks. Both the Chemical Index of Alteration (CIA) and the Weathering Index Scale (WIS) indicate a progressive increase in alteration up section, reaching values of CIA of 63 and WIS of 25%. The increase in CIA and WIS values is coupled with a decrease in calcium abundance, suggesting partial dissolution of Ca-bearing minerals (clinopyroxene and plagioclase). Mineralogy from the CheMin X-ray diffraction instrument indicates a decrease in mafic minerals compared with previously analyzed strata and a significant proportion of phyllosilicates consistent with this interpretation. Furthermore, these observations suggest that the sediments were predominantly altered in an open system, before or during their emplacement, contrasting with the rock-dominated conditions inferred in sedimentary deposits analyzed at Yellowknife Bay.},
doi = {10.1016/j.icarus.2018.11.004},
journal = {Icarus},
number = ,
volume = ,
place = {United States},
year = {Sat Nov 17 00:00:00 EST 2018},
month = {Sat Nov 17 00:00:00 EST 2018}
}

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