Washington, September 26 : NASA's Mars Reconnaissance Orbiter has revealed hundreds of small fractures exposed on the Martian surface that billions of years ago directed flows of water through underground Martian sandstone.
Researchers used images from the spacecraft's High Resolution Imaging Science Experiment, or HiRISE, camera, to detect the fractures.
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, US.
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," said Okubo.
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 in Pasadena, California.
"Ground water 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," she added.
The recent study focuses on layered deposits in Mars' Capen crater, approximately 43 miles in diameter and 7 degrees north of the equator.
This formerly unnamed crater became notable due to this discovery of deformation bands within it and was recently assigned a formal name.