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Showing 1–8 of 8 results
Advanced filters: Author: Scott L. Murchie Clear advanced filters

  • ‘The timing and ecological dynamics of extinction in the late Pleistocene are not well understood. Here, the authors use sediment ancient DNA from permafrost cores to reconstruct the paleoecology of the central Yukon, finding a substantial turnover in ecosystem composition between 13,500-10,000 years BP and persistence of some species past their supposed extinctions.’

    • Tyler J. Murchie
    • Alistair J. Monteath
    • Hendrik N. Poinar
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-18

  • Dark streaks that appear on the surface of Mars during warm seasons have been observed at the mid-latitudes and tentatively attributed to the flow of briny water. Imagery from the Mars Reconnaissance Orbiter over multiple Mars years suggests that these seasonally active features are also present in equatorial regions, where liquid surface water is not expected.

    • Alfred S. McEwen
    • Colin M. Dundas
    • Nicolas Thomas
    Research
    Nature Geoscience
    Volume: 7, P: 53-58

  • Transient streaks that appear seasonally on Martian slopes are consistent with brine flows, but evidence of water or salts has been lacking. Analysis of spectral data reveals hydrated salts associated with the streaks, confirming a briny origin.

    • Lujendra Ojha
    • Mary Beth Wilhelm
    • Matt Chojnacki
    Research
    Nature Geoscience
    Volume: 8, P: 829-832

  • 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

  • Felsic rocks have not been identified on Mars, a planet that lacks plate tectonics to drive the magmatic processes that lead to evolved silica-rich melts. Spectral observations by the Mars Reconnaissance Orbiter indicate that felsic lithologies occur at multiple localities on Mars and suggest prolonged magmatic activity on ancient Mars.

    • James J. Wray
    • Sarah T. Hansen
    • Mark S. Ghiorso
    Research
    Nature Geoscience
    Volume: 6, P: 1013-1017

  • Mercury appears darker globally than expected. Remote sensing evidence from the MESSENGER spacecraft indicates that the planet’s darkening agent is carbon and suggests that it originates from an ancient graphite-rich crust.

    • Patrick N. Peplowski
    • Rachel L. Klima
    • Sean C. Solomon
    Research
    Nature Geoscience
    Volume: 9, P: 273-276