High manganese concentrations in rocks at Gale crater, Mars

Nina L. Lanza, Woodward W. Fischer, Roger C. Wiens, John Grotzinger, Ann M. Ollila, Agnes Cousin, Ryan B. Anderson, Benton C. Clark, Ralf Gellert, Nicolas Mangold, Sylvestre Maurice, Stéphane Le Mouélic, Marion Nachon, Mariek Schmidt, Jeffrey Berger, Samuel M. Clegg, Olivier Forni, Craig Hardgrove, Noureddine Melikechi, Horton E. NewsomViolaine Sautter

Research output: Contribution to journalArticlepeer-review

75 Scopus citations


The surface of Mars has long been considered a relatively oxidizing environment, an idea supported by the abundance of ferric iron phases observed there. However, compared to iron, manganese is sensitive only to high redox potential oxidants, and when concentrated in rocks, it provides a more specific redox indicator of aqueous environments. Observations from the ChemCam instrument on the Curiosity rover indicate abundances of manganese in and on some rock targets that are 1-2 orders of magnitude higher than previously observed on Mars, suggesting the presence of an as-yet unidentified manganese-rich phase. These results show that the Martian surface has at some point in time hosted much more highly oxidizing conditions than has previously been recognized.

Original languageEnglish (US)
Pages (from-to)5755-5763
Number of pages9
JournalGeophysical Research Letters
Issue number16
StatePublished - Aug 28 2014

ASJC Scopus subject areas

  • Geophysics
  • General Earth and Planetary Sciences


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