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NASA orbiter reveals rock fracture plumbing on Mars

Deformation bands in martian bedrock help us further understand ancient groundwater on Mars.
Provided by the Jet Propulsion Laboratory, Pasadena, California
Deformation bands
Dense clusters of crack-like structures called deformation bands form the linear ridges prominent in this image from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter.
NASA/JPL-Caltech
September 26, 2008
NASA's Mars Reconnaissance Orbiter revealed hundreds of small fractures exposed on the martian surface. Billions of years ago these fractures directed flows of water through underground martian sandstone.

Researchers used images from the spacecraft's High Resolution Imaging Science Experiment (HiRISE) camera. Images of layered rock deposits at equatorial martian sites show the clusters of fractures to be a type called deformation bands, caused by stresses below the surface in granular or porous bedrock.

"Groundwater often flows along fractures such as these, and knowing that these are deformation bands helps us understand how the underground plumbing may have worked within these layered deposits," said Chris Okubo of the U.S. Geological Survey in Flagstaff, Arizona. Visible effects of water on the color and texture of rock along the fractures provide evidence that groundwater flowed extensively along the fractures.

"These structures are important sites for future exploration and investigations into the geological history of water and water-related processes on Mars," Okubo and co-authors state in a report published online this month in the Geological Society of America Bulletin.

Deformation band clusters in Utah sandstones, as on Mars, are a few yards wide and up to a few miles long. They form from either compression or stretching of underground layers and can be precursors to faults. The ones visible at the surface have become exposed as overlying layers erode away. Deformation bands and faults can strongly influence the movement of groundwater on Earth and appear to have been similarly important on Mars, according to this study.

"This study provides a picture of not just surface-water erosion, but true groundwater effects widely distributed over the planet," said Suzanne Smrekar, deputy project scientist for the Mars Reconnaissance Orbiter at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California. "Groundwater movement has important implications for how the temperature and chemistry of the crust have changed over time, which in turn affects the potential for habitats for past life."

The recent study focuses on layered deposits in Mars' Capen crater, approximately 43 miles (70 km) in diameter and 7° north of the equator. This formerly unnamed crater became notable due to the discovery of deformation bands within it and was recently assigned a formal name. The crater was named for the late Charles Capen, who studied Mars and other objects as an astronomer at JPL's Table Mountain Observatory in Southern California and at Lowell Observatory, Flagstaff, Arizona.
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