An astrobiological perspective on Meridiani Planum

Knoll, A. H. and Carr, M. and Clark, B. and Des Marais, D. J. and Farmer, J. D. and Fischer, W. W. and Grotzinger, J. P. and McLennan, S. M. and Malin, M. and SchrC6der, C. and Squyres, S. and Tosca, N. J. and Wdowiak, T. (2005) An astrobiological perspective on Meridiani Planum. Earth and Planetary Science Letters, 240 (1). pp. 179-189. DOI 10.1016/j.epsl.2005.09.045

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Sedimentary rocks exposed in the Meridiani Planum region of Mars record aqueous and eolian deposition in ancient dune and interdune playa-like environments that were arid, acidic, and oxidizing. On Earth, microbial populations have repeatedly adapted to low pH and both episodic and chronic water limitation, suggesting that, to a first approximation, the Meridiani plain may have been habitable during at least part of the interval when deposition and early diagenesis took place. On the other hand, the environmental conditions inferred for Meridiani deposition would have posed a challenge for prebiotic chemical reactions thought to have played a role in the origin of life on Earth. Orbital observations suggest that the combination of sulfate minerals and hematite found in Meridiani rocks may be unusual on the martian surface; however, there is reason to believe that acidity, aridity, and oxidizing conditions were broadly distributed on ancient Mars. When these conditions were established and how much environmental heterogeneity existed on early Mars remain to be determined. Because sulfates and iron oxides can preserve detailed geochemical records of environmental history as well as chemical, textural and microfossil signatures of biological activity, Meridiani Planum is an attractive candidate for Mars sample return. B) 2005 Elsevier B.V. All rights reserved.

Item Type: Article
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Earth and Planetary Science Letters
Volume: 240
Page Range: pp. 179-189
Identification Number: 10.1016/j.epsl.2005.09.045
Depositing User: Sarah Humbert
Date Deposited: 17 Dec 2009 12:54
Last Modified: 23 Jul 2013 09:56

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