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The opportunity Rover's athena science investigation at Meridiani Planum, Mars

  • S. W. Squyres
  • , R. E. Arvidson
  • , J. F. Bell
  • , J. Brückner
  • , N. A. Cabrol
  • , W. Calvin
  • , M. H. Carr
  • , P. R. Christensen
  • , B. C. Clark
  • , L. Crumpler
  • , D. J. Des Marais
  • , C. D'Uston
  • , T. Economou
  • , J. Farmer
  • , W. Farrand
  • , W. Folkner
  • , M. Golombek
  • , S. Gorevan
  • , J. A. Grant
  • , R. Greeley
  • J. Grotzinger, L. Haskin, K. E. Herkenhoff, S. Hviid, J. Johnson, G. Klingelhöfer, A. H. Knoll, G. Landis, M. Lemmon, R. Li, M. B. Madsen, M. C. Malin, S. M. McLennan, H. Y. McSween, D. W. Ming, J. Moersch, R. V. Morris, T. Parker, J. W. Rice, L. Richter, R. Rieder, M. Sims, M. Smith, P. Smith, L. A. Soderblom, R. Sullivan, H. Wänke, T. Wdowiak, M. Wolff, A. Yen

Research output: Contribution to journal › Article › peer-review

499 Scopus citations

Abstract

The Mars Exploration Rover Opportunity has investigated the landing site in Eagle crater and the nearby plains within Meridiani Planum. The soils consist of fine-grained basaltic sand and a surface lag of hematite-rich spherules, spherule fragments, and other granules. Wind ripples are common. Underlying the thin soil layer, and exposed within small impact craters and troughs, are flat-lying sedimentary rocks. These rocks are finely laminated, are rich in sulfur, and contain abundant sulfate salts. Small-scale cross-lamination in some locations provides evidence for deposition in flowing liquid water. We interpret the rocks to be a mixture of chemical and siliciclastic sediments formed by episodic inundation by shallow surface water, followed by evaporation, exposure, and desiccation. Hematite-rich spherules are embedded in the rock and eroding from them. We interpret these spherules to be concretions formed by postdepositional diagenesis, again involving liquid water.

Original languageEnglish
Pages (from-to)1698-1703
Number of pages6
JournalScience
Volume306
Issue number5702
DOIs
StatePublished - 3 Dec 2004
Externally publishedYes

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