Opportunity Rover Finds Strong Evidence Meridiani Planum Was Wet

MEDIA RELATIONS OFFICE JET PROPULSION LABORATORY CALIFORNIA INSTITUTE OF TECHNOLOGY NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109 TELEPHONE (818) 354-5011 http://www.jpl.nasa.gov
Guy Webster (818) 354-5011 Jet Propulsion Laboratory, Pasadena, Calif.
Donald Savage (202) 358-1547 NASA Headquarters, Washington March 2, 2004 NEWS RELEASE: 2004-074 OPPORTUNITY ROVER FINDS STRONG EVIDENCE MERIDIANI PLANUM WAS WET
Scientists have concluded the part of Mars that NASA's Opportunity rover is exploring was soaking wet in the past.
Evidence the rover found in a rock outcrop led scientists to the conclusion. Clues from the rocks' composition, such as the presence of sulfates, and the rocks' physical appearance, such as niches where crystals grew, helped make the case for a watery history.
"Liquid water once flowed through these rocks. It changed their texture, and it changed their chemistry," said Dr. Steve Squyres of Cornell University, Ithaca, N.Y., principal investigator for the science instruments on Opportunity and its twin, Spirit. "We've been able to read the tell-tale clues the water left behind, giving us confidence in that conclusion."
Dr. James Garvin, lead scientist for Mars and lunar exploration at NASA Headquarters, Washington, said, "NASA launched the Mars Exploration Rover mission specifically to check whether at least one part of Mars ever had a persistently wet environment that could possibly have been hospitable to life. Today we have strong evidence for an exciting answer: Yes."
Opportunity has more work ahead. It will try to determine whether, besides being exposed to water after they formed, the rocks may have originally been laid down by minerals precipitating out of solution at the bottom of a salty lake or sea.
The first views Opportunity sent of its landing site in Mars' Meridiani Planum region five weeks ago delighted researchers at NASA's Jet Propulsion Laboratory, Pasadena, Calif., because of the good fortune to have the spacecraft arrive next to an exposed slice of bedrock on the inner slope of a small crater.
The robotic field geologist has spent most of the past three weeks surveying the whole outcrop, and then turning back for close-up inspection of selected portions. The rover found a very high concentration of sulfur in the outcrop with its alpha particle X-ray spectrometer, which identifies chemical elements in a sample. "The chemical form of this sulfur appears to be in magnesium, iron or other sulfate salts," said Dr. Benton Clark of Lockheed Martin Space Systems, Denver. "Elements that can form chloride or even bromide salts have also been detected."
At the same location, the rover's Moessbauer spectrometer, which identifies iron-bearing minerals, detected a hydrated iron sulfate mineral called jarosite. Germany provided both the alpha particle X-ray spectrometer and the Moessbauer spectrometer. Opportunity's miniature thermal emission spectrometer has also provided evidence for sulfates.
On Earth, rocks with as much salt as this Mars rock either have formed in water or, after formation, have been highly altered by long exposures to water. Jarosite may point to the rock's wet history having been in an acidic lake or an acidic hot springs environment.
The water evidence from the rocks' physical appearance comes in at least three categories, said Dr. John Grotzinger, sedimentary geologist from the Massachusetts Institute of Technology, Cambridge: indentations called "vugs," spherules and crossbedding.
Pictures from the rover's panoramic camera and microscopic imager reveal the target rock, dubbed "El Capitan," is thoroughly pocked with indentations about a centimeter (0.4 inch) long and one-fourth or less that wide, with apparently random orientations. This distinctive texture is familiar to geologists as the sites where crystals of salt minerals form within rocks that sit in briny water. When the crystals later disappear, either by erosion or by dissolving in less-salty water, the voids left behind are called vugs, and in this case they conform to the geometry of possible former evaporite minerals.
Round particles the size of BBs are embedded in the outcrop. From shape alone, these spherules might be formed from volcanic eruptions, from lofting of molten droplets by a meteor impact, or from accumulation of minerals coming out of solution inside a porous, water-soaked rock. Opportunity's observations that the spherules are not concentrated at particular layers in the outcrop weigh against a volcanic or impact origin, but do not completely rule out those origins.
Layers in the rock that lie at an angle to the main layers, a pattern called crossbedding, can result from the action of wind or water. Preliminary views by Opportunity hint the crossbedding bears hallmarks of water action, such as the small scale of the crossbedding and possible concave patterns formed by sinuous crestlines of underwater ridges.
The images obtained to date are not adequate for a definitive answer. So scientists plan to maneuver Opportunity closer to the features for a better look. "We have tantalizing clues, and we're planning to evaluate this possibility in the near future," Grotzinger said.
JPL, a division of the California Institute of Technology in Pasadena, manages the Mars Exploration Rover project for NASA's Office of Space Science, Washington.
For information about NASA and the Mars mission on the Internet, visit
http://www.nasa.gov
Images and additional information about the project are also available on the Internet at:
http://marsrovers.jpl.nasa.gov
and
http://athena.cornell.edu
-end-
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snipped-for-privacy@earthlink.net (Ron) wrote in message

Sulfates are also blamed for the production of sperules composed of zinc sulfide. http://www.hypography.com/article.cfm?id (774 http://www.sciencenews.org/articles/20031115/bob9.asp Should the blueberry bowl contain zinc sulfide, I shall reread the reference even though it contains a bacterial step in the reduction of sulfate to sulfide. John Curtis.
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Please note that the spherules referred to in the article cited are nanometer sized. A few MILLION times smaller than the spherules on Mars!
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It contains a bacterial step in almost every reference. It seems to me the articles are about how bacteria can evolve in deep underground areas with low oxygen and high salinity. Much like the surface at the Opportunity site.
From the first article. "In the paper, the Wisconsin team described a process by which tiny zinc sulfide crystals rapidly accumulate within natural biofilms populated by species of sulfate-reducing bacteria."
Such sulfate reducing bacteria happened to be the primary food source for the very first multi cellular life on earth, sponges! http://webdoc.gwdg.de/diss/2003/hoffmann/hoffmann.pdf
Early forms of sponges on earth give off tons of these when their ....dying. http://waynesword.palomar.edu/plfeb96.htm#gemmules
And do mineral concretions float? Nasa clearly stated the even and random layering of the spheres is due to water distribution. The regional pic below shows the dark material drifted away from the larger craters.
Overhead views of Meridiani http://www.msss.com/mars_images/moc/2004/01/24 /
Jonathan
s
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