Overview of Recent Results from the Mars Exploration Rover Opportunity

Details Overview of Recent Results from the Mars Exploration Rover Opportunity Overview of Recent Results from the Mars Exploration Rover Opportunity

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p43a..01s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P43A-01

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6225 Mars

Scientific paper

As of September, 2006, the Mars Exploration Rover Opportunity has traversed more than 9 km across Meridiani Planum. Bedrock exposed along the route in impact craters and at other local outcrops continues to be sandstone composed of mixed sulfate/siliciclastic sand grains. Features observed in the past year of operations include well-developed festoon (trough) cross-lamination formed in flowing liquid water, strata with smaller and more abundant hematite-rich concretions than 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. The bedrock is overlain in most places by a thin cover of basaltic sand and hematite-rich concretions and concretion fragments. Along much of Opportunity's recent traverse, these materials form north-south trending eolian bedforms several tens of cm in height. The goal of Opportunity's southward traverse is Victoria crater, an eroded impact crater more than 800 meters in diameter. The annulus of material around Victoria crater, which probably represents the eroded remnants of the crater's continuous ejecta blanket, contains concretions larger than those in nearby bedrock that may have been excavated from deeper strata within the crater. The presentation will include the most up-to-date results from the rover.

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