En echelon veins
In structural geology, en échelon veins or "en échelon gash fractures" are structures within rock caused by noncoaxial shear. They appear as sets of short, parallel, lenses on the surface of a rock. They are planar structures within the rock. They originate as tension fractures and are subsequently filled by precipitation of a mineral, typically quartz or calcite.
- Davis, G. H., and Reynolds, S. J., Structural Geology of Rocks and Regions. 2nd Ed. 1996 ISBN 0-471-52621-5
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