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Magnesium sulphate salts and the history of water on Mars

Author

Listed:
  • David T. Vaniman

    (Los Alamos National Laboratory (LANL))

  • David L. Bish

    (Indiana University)

  • Steve J. Chipera

    (Los Alamos National Laboratory (LANL))

  • Claire I. Fialips

    (Los Alamos National Laboratory (LANL))

  • J. William Carey

    (Los Alamos National Laboratory (LANL))

  • William C. Feldman

    (Los Alamos National Laboratory (LANL))

Abstract

Recent reports of ∼30 wt% of sulphate within saline sediments on Mars1,2—probably occurring in hydrated form3—suggest a role for sulphates in accounting for equatorial H2O observed in a global survey by the Odyssey spacecraft4. Among salt hydrates likely to be present3, those of the MgSO4·nH2O series have many hydration states. Here we report the exposure of several of these phases to varied temperature, pressure and humidity to constrain their possible H2O contents under martian surface conditions. We found that crystalline structure and H2O content are dependent on temperature–pressure history, that an amorphous hydrated phase with slow dehydration kinetics forms at

Suggested Citation

  • David T. Vaniman & David L. Bish & Steve J. Chipera & Claire I. Fialips & J. William Carey & William C. Feldman, 2004. "Magnesium sulphate salts and the history of water on Mars," Nature, Nature, vol. 431(7009), pages 663-665, October.
    • Handle: RePEc:nat:nature:v:431:y:2004:i:7009:d:10.1038_nature02973
    DOI: 10.1038/nature02973
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    Cited by:

    1. Rozeline Wijnhorst & Menno Demmenie & Etienne Jambon-Puillet & Freek Ariese & Daniel Bonn & Noushine Shahidzadeh, 2023. "Softness of hydrated salt crystals under deliquescence," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    2. Takuya Hatakeyama & Norihiko L. Okamoto & Satoshi Otake & Hiroaki Sato & Hongyi Li & Tetsu Ichitsubo, 2022. "Excellently balanced water-intercalation-type heat-storage oxide," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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