Origin of the outer layer of martian low-aspect ratio layered ejecta craters

Joseph M. Boyce, Lionel Wilson, Nadine G. Barlow

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Low-aspect ratio layered ejecta (LARLE) craters are one of the most enigmatic types of martian layered ejecta craters. We propose that the extensive outer layer of these craters is produced through the same base surge mechanism as that which produced the base surge deposits generated by near-surface, buried nuclear and high-explosive detonations. However, the LARLE layers have higher aspect ratios compared with base surge deposits from explosion craters, a result of differences in thicknesses of these layers. This characteristics is probably caused by the addition of large amounts of small particles of dust and ice derived from climate-related mantles of snow, ice and dust in the areas where LARLE craters form. These deposits are likely to be quickly stabilized (order of a few days to a few years) from eolian erosion by formation of duricrust produced by diffusion of water vapor out of the deposits.

Original languageEnglish (US)
Pages (from-to)263-272
Number of pages10
JournalIcarus
Volume245
DOIs
StatePublished - Jan 1 2015

Keywords

  • Cratering
  • Geological processes
  • Impact processes
  • Mars, surface
  • Terrestrial planets

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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