Rock Hounding on Mars
Deep Tracks In Colorful Salt

Spirit Rover playing in the sand...

When one of Spirit's wheels became jammed, it caused the wheel arm to drag through the soft sand. Just beneath the brown top soil layer of dust, Spirit uncovered MINERAL SALTS of various colors. Just like the dry lake beds in Nevada where the seas and lakes have dried up and left salt flats, so too do we find deep deposits of salt on Mars. However they are not hard packed on Mars like they are in the deserts of earth because there is no current rainfall. In the images below we see the yellow of SULFUR and shades of pale blue and white.

Panoramic Camera :: Sol 784
Image Source: NASA
Image Source: NASA
Image Source: NASA

NASA: SOL 784 Gallery

Salts of Many Colors
Panoramic Camera :: Sol 78
Image Source: NASA
Image Source: NASA

NASA: SOL 788 Gallery
Panoramic Camera :: Sol 788

Image Source: NASA
Image Source: NASA

NASA: SOL 788 Gallery
Panoramic Camera :: Sol 788
Image Source: NASA
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Image Source: NASA

NASA: SOL 788 Gallery

Sulfur-rich Soil on Mars Puzzles Scientists
Panoramic Camera :: Sol 790

This image shows the strikingly bright tone and large extent of the materials uncovered by NASA's Mars Exploration Rover Spirit. (NASA/JPL-Caltech/Cornell)
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Last Updated: Thursday, March 15, 2007 | 11:52 AM ET
CBC News Canada

The discovery of Martian soil containing high quantities of sulphur and traces of water has sparked new questions about activity beneath the planet's surface.

Scientists are puzzling over the contents of the bright white and yellow soil, first discovered after Mars rover Spirit churned it up while struggling to cross a soft patch of soil in the Columbia Hills region nearly a year ago.

The material consists of sulphate salts associated with iron and likely calcium, substances not expected to be found on the planet's surface.

Some scientists have speculated the materials might have been deposited in ancient times by liquid water on what is now thought to be a dry planet. However, Ray Arvidson, the deputy principal investigator for NASA's twin Mars rovers, Spirit and Opportunity, said that is only one possible explanation.

"This material could have been left behind by water that dissolved these minerals underground, then came to the surface and evaporated, or it could be a volcanic deposit formed around ancient gas vents," Arvidson said in a statement.

Scientists want to learn more about the planet's geological history for insight into the larger questions of whether Mars once supported life and whether liquid water can still be found beneath its surface, questions important to understanding whether it could one day support life.

Spirit and Opportunity have been exploring the planet's surface since they rolled onto it over three years ago. The rovers will have company on the planet's surface after the Phoenix polar lander launches from Earth in August. NASA's Mars Science Laboratory, a more advanced rover, is scheduled to launch in 2009.

Finding out which theory explains the presence of the sulphur-rich soil will depend on where other samples are discovered, Arvidson said.

"If we find them along fractures, that would suggest they were deposited at ancient gas vents," he said. "If they are at the saddles between hills, that would suggest the deposits formed where groundwater came to the surface."

Locating the soil is not without peril for Spirit, however, since the softer soil regions might entrap the rover and leave its wheels spinning.

Arvidson and NASA scientists described their findings at a meeting this week at the Lunar and Planetary Science Conference in League City, Tex.

SOURCE: CBC News Canada

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(NASA/JPL-Caltech/Cornell)
(NASA/JPL-Caltech/Cornell)

NASA: SOL 790 Gallery

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