Chemical alteration of fine-grained sedimentary rocks at Gale crater

N. Mangold, E. Dehouck, C. Fedo, O. Forni, C. Achilles, T. Bristow, Robert T Downs, J. Frydenvang, O. Gasnault, J. L'Haridon, L. Le Deit, S. Maurice, S. M. McLennan, P. Y. Meslin, S. Morrison, H. E. Newsom, E. Rampe, W. Rapin, F. Rivera-Hernandez, M. Salvatore

Research output: Contribution to journalArticle

1 Citation (Scopus)

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. 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.

Original languageEnglish (US)
Pages (from-to)619-631
Number of pages13
JournalIcarus
Volume321
DOIs
StatePublished - Mar 15 2019

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chemical alteration
sedimentary rocks
craters
crater
sedimentary rock
weathering
minerals
phyllosilicate
chemical weathering
mineralogy
mineral
strata
plagioclase
clinopyroxene
index
calcium
proportion
dissolving
sediments
emplacement

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Mangold, N., Dehouck, E., Fedo, C., Forni, O., Achilles, C., Bristow, T., ... Salvatore, M. (2019). Chemical alteration of fine-grained sedimentary rocks at Gale crater. Icarus, 321, 619-631. https://doi.org/10.1016/j.icarus.2018.11.004

Chemical alteration of fine-grained sedimentary rocks at Gale crater. / Mangold, N.; Dehouck, E.; Fedo, C.; Forni, O.; Achilles, C.; Bristow, T.; Downs, Robert T; Frydenvang, J.; Gasnault, O.; L'Haridon, J.; Le Deit, L.; Maurice, S.; McLennan, S. M.; Meslin, P. Y.; Morrison, S.; Newsom, H. E.; Rampe, E.; Rapin, W.; Rivera-Hernandez, F.; Salvatore, M.

In: Icarus, Vol. 321, 15.03.2019, p. 619-631.

Research output: Contribution to journalArticle

Mangold, N, Dehouck, E, Fedo, C, Forni, O, Achilles, C, Bristow, T, Downs, RT, Frydenvang, J, Gasnault, O, L'Haridon, J, Le Deit, L, Maurice, S, McLennan, SM, Meslin, PY, Morrison, S, Newsom, HE, Rampe, E, Rapin, W, Rivera-Hernandez, F & Salvatore, M 2019, 'Chemical alteration of fine-grained sedimentary rocks at Gale crater' Icarus, vol. 321, pp. 619-631. https://doi.org/10.1016/j.icarus.2018.11.004
Mangold N, Dehouck E, Fedo C, Forni O, Achilles C, Bristow T et al. Chemical alteration of fine-grained sedimentary rocks at Gale crater. Icarus. 2019 Mar 15;321:619-631. https://doi.org/10.1016/j.icarus.2018.11.004
Mangold, N. ; Dehouck, E. ; Fedo, C. ; Forni, O. ; Achilles, C. ; Bristow, T. ; Downs, Robert T ; Frydenvang, J. ; Gasnault, O. ; L'Haridon, J. ; Le Deit, L. ; Maurice, S. ; McLennan, S. M. ; Meslin, P. Y. ; Morrison, S. ; Newsom, H. E. ; Rampe, E. ; Rapin, W. ; Rivera-Hernandez, F. ; Salvatore, M. / Chemical alteration of fine-grained sedimentary rocks at Gale crater. In: Icarus. 2019 ; Vol. 321. pp. 619-631.
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AU - Downs, Robert T

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AU - Maurice, S.

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AU - Newsom, H. E.

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AU - Rivera-Hernandez, F.

AU - Salvatore, M.

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