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Figures 2A, 2B and 2C
Feb. 15, 2007
Light-Toned Bedrock Along Cracks as Evidence of Fluid Alteration
The scene includes examples of thin dark lines bordered by light-toned bedrock. The dark lines are interpreted as fractures, called joints, that were formerly underground but have been exposed at the surface by erosion of overlying material. The light-toned material along the joints is interpreted as features called halos, resulting from mineral alteration (bleaching, cementation or both) of the walls of the fractures by fluid moving through the fractures.
Image Credit: NASA/JPL/Univ. of Arizona
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