| Abstract: | 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. ?? 2005 Elsevier B.V. All rights reserved. |
| Genre: | Article |
| ProdID: | 70027618 |
| Citation Author: | Knoll, A. H.; Carr, M.; Clark, B.; Des, Marais, D. J.; Farmer, J. D.; Fischer, W. W.; Grotzinger, J. P.; McLennan, S. M.; Malin, M.; Schroder, C.; Squyres, S.; Tosca, N. J.; Wdowiak, T. |
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| Citation End Page: | 189 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Earth and Planetary Science Letters |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | An astrobiological perspective on Meridiani Planum; 2005; Article; Journal; Earth and Planetary Science Letters; Knoll, A. H.; Carr, M.; Clark, B.; Des, Marais, D. J.; Farmer, J. D.; Fischer, W. W.; Grotzinger, J. P.; McLennan, S. M.; Malin, M.; Schroder, C.; Squyres, S.; Tosca, N. J.; Wdowiak, T. |
| Citation Start Page: | 179 |
| Citation Volume: | 240 |
| Citation Year: | 2005 |
| Type: | citation/reference |
| Text: | An astrobiological perspective on Meridiani Planum; 2005; Article; Journal; Earth and Planetary Science Letters; Knoll, A. H.; Carr, M.; Clark, B.; Des, Marais, D. J.; Farmer, J. D.; Fischer, W. W.; Grotzinger, J. P.; McLennan, S. M.; Malin, M.; Schroder, C.; Squyres, S.; Tosca, N. J.; Wdowiak, T. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/j.epsl.2005.09.045 |
| Date Other: | Sat, 1 Jan 2005 00:00 -0600 |
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