tubapro12 writes: NASA's Mars Reconnaissance Orbiter has detected light-toned bedrock on Mars occurring in an alternating pattern with darker bedrock within a rift valley. Researchers at the University of Arizona point to this as a product of a liquid, probably water, passing through the rocks.
"On Earth, bleaching of rock surrounding a fracture is a clear indication of chemical interactions between fluids circulating within the fracture and the host rock," Okubo and co-author Alfred S. McEwen reported in the paper. The researchers also said that layered outcrops can indicate cycles with materials deposited by regular episodes of water, wind or volcanic activity.
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