Desiccation cracks provide evidence of lake drying on Mars, Sutton Island member, Murray formation, Gale Crater

Thèmes de recherche:
Année:
2018
Auteurs:
  • N. Stein
  • J. P. Grotzinger
  • J. Schieber
  • Nicolas Mangold
  • B. Hallet
  • H. Newsom
  • K. M. Stack
  • J. A. Berger
  • L. Thompson
  • K. L. Siebach
  • A. Cousin
  • Stéphane Le Mouélic
  • M. Minitti
  • D. Y. Sumner
  • C. Fedo
  • C. H. House
  • S. Gupta
  • A. R. Vasavada
  • R. Gellert
  • R. C. Wiens
  • J. Frydenvang
  • O. Forni
  • P. Y. Meslin
  • V Payre
  • Erwin Dehouck
Journal:
GEOLOGY
Volume:
46
Numéro:
6
Pages:
515-518
Mois:
Juin
ISSN:
0091-7613
Résumé:
Mars Science Laboratory (MSL) Curiosity rover data are used to describe
the morphology of desiccation cracks observed in ancient lacustrine
strata at Gale crater, Mars, and to interpret their paleoenvironmental
setting. The desiccation cracks indicate subaerial exposure of
lacustrine facies in the Sutton Island member of the Murray formation.
In association with ripple cross-stratification and possible eolian
cross-bedding, these facies indicate a transition from longer-lived
perennial lakes recorded by older strata to younger lakes characterized
by intermittent exposure. The transition from perennial to episodically
exposed lacustrine environments provides evidence for local to regional
climate change that can help constrain Mars climate models.