Seasonality of present-day Martian dune-gully activity

Serina Diniega, Shane Byrne, Nathan T. Bridges, Colin M. Dundas, Alfred S. McEwen

Research output: Contribution to journalArticle

71 Scopus citations

Abstract

Martian slope gullies are argued to be evidence for recent liquid water flow on the surface of Mars. To explain the source of water, a wide range of environmental conditions and processes has been invoked. However, a lack of information about the environmental context or timing of gully activity makes it difficult to evaluate the theories. Here, we present new observations of extensive gully modification over the past 6 Mars years within dune gullies with slope-gully morphology. Observed activity within 18 gullies in 7 dune fields constrains timing to winter, which is consistent with observed slope-gully activity. These observations show that fluvial processes are unlikely to cause present-day Martian dune-gully activity, and imply that CO2 frost accumulation may play the dominant role.

Original languageEnglish (US)
Pages (from-to)1047-1050
Number of pages4
JournalGeology
Volume38
Issue number11
DOIs
StatePublished - Nov 1 2010

ASJC Scopus subject areas

  • Geology

Fingerprint Dive into the research topics of 'Seasonality of present-day Martian dune-gully activity'. Together they form a unique fingerprint.

  • Cite this