Two Years at Meridiani Planum: Results from the Opportunity Rover
Abstract
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.
Additional Information
© 2013 American Association for the Advancement of Science. 5 June 2006; accepted 28 July 2006. This research was carried out for the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA.Additional details
- Eprint ID
- 38022
- Resolver ID
- CaltechAUTHORS:20130418-104807440
- NASA/JPL/Caltech
- Created
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2013-04-18Created from EPrint's datestamp field
- Updated
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2022-11-30Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences