Water Abundance of Dunes in Gale Crater, Mars From Active Neutron Experiments and Implications for Amorphous Phases

T. S.J. Gabriel, Craig Hardgrove, S. Czarnecki, E. B. Rampe, W. Rapin, C. N. Achilles, D. Sullivan, S. Nowicki, L. Thompson, M. Litvak, I. Mitrofanov, R. T. Downs

Research output: Contribution to journalArticle

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Abstract

We report the water abundance of Bagnold Dune sand in Gale crater, Mars by analyzing active neutron experiments using the Dynamic Albedo of Neutrons instrument. We report a bulk water-equivalent-hydrogen abundance of 0.68 ± 0.15 wt%, which is similar to measurements several kilometers away and from those taken of the dune surface. Thus, the dune is likely dehydrated throughout. Furthermore, we use geochemical constraints, including bulk water content, to develop compositional models of the amorphous fraction for which little information is known. We find the amorphous fraction contains ∼26- to 64-wt% basaltic glass and up to ∼24-wt% rhyolitic glass, suggesting at least one volcanic source for the dune material. We also find a range of hydrated phases may be present in appreciable abundances, either from the incorporation of eroded aqueously altered sediments or the direct alteration of the dune sand.

Original languageEnglish (US)
Pages (from-to)12,766-12,775
JournalGeophysical Research Letters
Volume45
Issue number23
DOIs
StatePublished - Dec 16 2018

Fingerprint

Mars craters
dunes
crater
dune
Mars
neutrons
water
experiment
glass
albedo
moisture content
volcanology
sediments
water content
hydrogen
sediment

Keywords

  • amorphous
  • Curiosity rover
  • DAN
  • Mars
  • neutron spectroscopy
  • water

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Water Abundance of Dunes in Gale Crater, Mars From Active Neutron Experiments and Implications for Amorphous Phases. / Gabriel, T. S.J.; Hardgrove, Craig; Czarnecki, S.; Rampe, E. B.; Rapin, W.; Achilles, C. N.; Sullivan, D.; Nowicki, S.; Thompson, L.; Litvak, M.; Mitrofanov, I.; Downs, R. T.

In: Geophysical Research Letters, Vol. 45, No. 23, 16.12.2018, p. 12,766-12,775.

Research output: Contribution to journalArticle

Gabriel, TSJ, Hardgrove, C, Czarnecki, S, Rampe, EB, Rapin, W, Achilles, CN, Sullivan, D, Nowicki, S, Thompson, L, Litvak, M, Mitrofanov, I & Downs, RT 2018, 'Water Abundance of Dunes in Gale Crater, Mars From Active Neutron Experiments and Implications for Amorphous Phases', Geophysical Research Letters, vol. 45, no. 23, pp. 12,766-12,775. https://doi.org/10.1029/2018GL079045
Gabriel, T. S.J. ; Hardgrove, Craig ; Czarnecki, S. ; Rampe, E. B. ; Rapin, W. ; Achilles, C. N. ; Sullivan, D. ; Nowicki, S. ; Thompson, L. ; Litvak, M. ; Mitrofanov, I. ; Downs, R. T. / Water Abundance of Dunes in Gale Crater, Mars From Active Neutron Experiments and Implications for Amorphous Phases. In: Geophysical Research Letters. 2018 ; Vol. 45, No. 23. pp. 12,766-12,775.
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