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In Situ Evidence for an Ancient Aqueous Environment at Meridiani Planum, Mars

by Johnson, J. R. , McLennan, S. M. , Rieder, R. , Farrand, W. H. , Arvidson, R. E. , Knoll, A. H. , Rice, J. W. , Morris, R. V. , Klingelhöfer, G. , Calvin, W. , Herkenhoff, K. E. , Grotzinger, J. P. , Bell, J. F. , Crisp, J. A. , Clark, B. C. , McSween, H. Y. , Squyres, S. W. , Christensen, P. R. , Soderblom, L. A.

in Bedding / Desiccation / Discovery and exploration / Environmental aspects / Environmental conditions / Evaporation / Exobiology / Extraterrestrial Environment / Ferric Compounds / Geologic Sediments / Hematite / Impact craters / Laminates / Life / Lunar And Planetary Science And Exploration / Magnesium sulfate / Mars / Mars (Planet) / Mineralogy / Minerals / Organic Chemistry / Outcrops / Petrology / Research Articles and Reports / Rocks / Salts / Sedimentary rocks / Sediments / Silicates / Spacecraft / Spectrum Analysis / Sulfates / Sulfur / Surface (Geology) / Surface water / Water

2004

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In Situ Evidence for an Ancient Aqueous Environment at Meridiani Planum, Mars

2004

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In Situ Evidence for an Ancient Aqueous Environment at Meridiani Planum, Mars

2004

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Journal Article

In Situ Evidence for an Ancient Aqueous Environment at Meridiani Planum, Mars

Johnson, J. R.,

McLennan, S. M.,

Rieder, R.,

Farrand, W. H.,

Arvidson, R. E.,

Knoll, A. H.,

Rice, J. W.,

Morris, R. V.,

Klingelhöfer, G.,

Calvin, W.,

Herkenhoff, K. E.,

Grotzinger, J. P.,

Bell, J. F.,

Crisp, J. A.,

Clark, B. C.,

McSween, H. Y.,

Squyres, S. W.,

Christensen, P. R.,

Soderblom, L. A.

2004

Overview

Sedimentary rocks at Eagle crater in Meridiani Planum are composed of fine-grained siliciclastic materials derived from weathering of basaltic rocks, sulfate minerals (including magnesium sulfate and jarosite) that constitute several tens of percent of the rock by weight, and hematite. Cross-stratification observed in rock outcrops indicates eolian and aqueous transport. Diagenetic features include hematite-rich concretions and crystal-mold vugs. We interpret the rocks to be a mixture of chemical and siliciclastic sediments with a complex diagenetic history. The environmental conditions that they record include episodic inundation by shallow surface water, evaporation, and desiccation. The geologic record at Meridiani Planum suggests that conditions were suitable for biological activity for a period of time in martian history.

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Publisher

American Association for the Advancement of Science,The American Association for the Advancement of Science

Subject

Bedding

/ Desiccation

/ Discovery and exploration

/ Environmental aspects

/ Environmental conditions

/ Evaporation

/ Exobiology