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Showing 1–7 of 7 results
Advanced filters: Author: Bethany L. Ehlmann Clear advanced filters

  • Hydrous clay minerals detected on the ancient martian crust have been proposed to have formed by aqueous weathering on a warm, wet early Mars. However, analyses of terrestrial clay minerals and comparisons to Mars suggest that the Noachian clays could have alternatively formed by precipitation from magmatic fluids.

    • Alain Meunier
    • Sabine Petit
    • Eric Ferrage
    Research
    Nature Geoscience
    Volume: 5, P: 739-743

  • In the Gale Crater on Mars, organic matter has been detected, but in much lower concentrations than expected. Here, the authors conduct clay mineral synthesis experiments which suggest that clay minerals may rapidly form under oxidized conditions and thus explain the low organic concentrations in Gale Crater.

    • Seth R. Gainey
    • Elisabeth M. Hausrath
    • Courtney L. Bartlett
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-7

  • High-resolution data from the Mars Reconnaissance Orbiter are used to identify clay-rich fluvial-lacustrine sediments in an open lake basin on Mars near the 45-km-diameter Jezero crater. The basin contains sedimentary deposits of hydrous minerals sourced from a smectite-rich catchment in the Nili Fossae region, which are well suited for the sequestration and preservation of organic material.

    • Bethany L. Ehlmann
    • John F. Mustard
    • Scott L. Murchie
    Research
    Nature Geoscience
    Volume: 1, P: 355-358

  • Photochemical modelling suggests that H2 outgassing from crustal hydration could have supported transient warming episodes on early Mars in a CO2-rich atmosphere with abrupt transitions to cold climate states in a CO-rich atmosphere.

    • Danica Adams
    • Markus Scheucher
    • Yuk L. Yung
    Research
    Nature Geoscience
    Volume: 18, P: 133-139

  • Mars’s early climate and surface chemistry varied between a generally cold, oxidizing environment and warmer, more reducing conditions, according to a model of atmospheric evolution driven by stochastic, random injection of greenhouse gases.

    • Robin Wordsworth
    • Andrew H. Knoll
    • Kathryn Steakley
    Research
    Nature Geoscience
    Volume: 14, P: 127-132

  • Mars likely evolved from a warmer, wetter early state to the cold, arid current climate, but this evolution is not reflected in recent observations and measurements. Here, the authors derive quantitative constraints on the atmospheric pressure through time, identifying a mechanism that explains the carbon data.

    • Renyu Hu
    • David M. Kass
    • Yuk L. Yung
    ResearchOpen Access
    Nature Communications
    Volume: 6, P: 1-9