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Active Boulder Movement at High Martian Latitudes.

Colin M Dundas1, Michael T Mellon2, Susan J Conway3

  • 1U.S. Geological Survey Astrogeology Science Center Flagstaff AZ USA.

Geophysical Research Letters
|August 20, 2019
PubMed
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Active boulder movement on Martian slopes suggests lobate landforms may be actively forming. This newly discovered process could be a significant factor in Martian slope erosion, potentially occurring without liquid water.

Keywords:
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Area of Science:

  • Planetary Science
  • Geology
  • Mars Exploration

Background:

  • Lobate stony landforms are observed on steep, high-latitude Martian slopes.
  • The processes shaping these landforms and Martian slopes are not fully understood.

Purpose of the Study:

  • To investigate active geological processes on Martian slopes.
  • To determine if boulder movement is occurring at lobate landform sites.

Main Methods:

  • Analysis of high-resolution imagery from Mars orbiters.
  • Identification and tracking of submeter-scale boulder displacements over time.

Main Results:

  • Demonstrated active boulder movement at seven distinct lobate landform sites.
  • Observed frequent boulder displacements of several meters, concentrated near lobate features but also on other slopes.
  • Identified a common style of slope activity on Mars.

Conclusions:

  • Active boulder movement is a widespread phenomenon on Martian slopes, contributing to slope degradation.
  • Lobate landforms may be currently forming through mechanisms that do not require significant liquid water.