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Two Years at Meridiani Planum: Results from the Opportunity Rover

by McLennan, S. M. , Glotch, T. D. , Johnson, J. R. , Farrand, W. H. , Knoll, A. H. , Arvidson, R. E. , Calvin, W. M. , Jolliff, B. L. , Klingelhöfer, G. , Golombek, M. P. , Herkenhoff, K. E. , Grotzinger, J. P. , Bell, J. F. , Clark, B. C. , Tosca, N. , Yen, A. S. , McSween, H. Y. , Squyres, S. W.

in Acids / Astronomy / Basalt / Cosmochemistry. Extraterrestrial geology / Crystals / Dehydration / Earth sciences / Earth, ocean, space / Endurance / Environmental conditions / environmental factors / Exact sciences and technology / Extraterrestrial Environment / Extraterrestrial geology / Ferric Compounds / Geologic Sediments / Geology / Groundwater / Impact craters / Mars / Meridian observation / Minerals / Outcrops / Rock textures / Rocks / Sand / Silicates / Space exploration / Spacecraft / Sulfates / Time / Water / weathering

2006

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Two Years at Meridiani Planum: Results from the Opportunity Rover

2006

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Two Years at Meridiani Planum: Results from the Opportunity Rover

2006

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Journal Article

Two Years at Meridiani Planum: Results from the Opportunity Rover

McLennan, S. M.,

Glotch, T. D.,

Johnson, J. R.,

Farrand, W. H.,

Knoll, A. H.,

Arvidson, R. E.,

Calvin, W. M.,

Jolliff, B. L.,

Klingelhöfer, G.,

Golombek, M. P.,

Herkenhoff, K. E.,

Grotzinger, J. P.,

Bell, J. F.,

Clark, B. C.,

Tosca, N.,

Yen, A. S.,

McSween, H. Y.,

Squyres, S. W.

2006

Overview

The Mars Exploration Rover Opportunity has spent more than 2 years exploring Meridiani Planum, traveling ~8 kilometers and detecting features that reveal ancient environmental conditions. These include well-developed festoon (trough) cross-lamination formed in flowing liquid water, strata with smaller and more abundant hematite-rich concretions than those seen previously, possible relict \"hopper crystals\" that might reflect the formation of halite, thick weathering rinds on rock surfaces, resistant fracture fills, and networks of polygonal fractures likely caused by dehydration of sulfate salts. Chemical variations with depth show that the siliciclastic fraction of outcrop rock has undergone substantial chemical alteration from a precursor basaltic composition. Observations from microscopic to orbital scales indicate that ancient Meridiani once had abundant acidic groundwater, arid and oxidizing surface conditions, and occasional liquid flow on the surface.

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Publisher

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

Subject

Acids

/ Astronomy

/ Basalt

/ Cosmochemistry. Extraterrestrial geology

/ Crystals

/ Dehydration

/ Earth sciences