Three independent lines of evidence in samples from the Conococheague Formation, northwestern Virginia, show that solution cleavage zones are best explained by the propagation (anticrack) model of solution zone formation. (1) Anticrack model predictions of the plastic deformation associated with propagating solution zones compare favorably to plastic deformation in rocks measured along the trace of solution cleavage zones by using an X-ray pole figure texture goniometer; (2) volume strain, measured with an electron microprobe along cleavage zones, diminishes from the center of solution cleavage zones to the tip; and (3) curvature of solution cleavage zones in three samples from different locations on folds follows incremental strain elongation. These three lines of evidence, taken together, are consistent with the anticrack origin of pressure solution for the surfaces studied.

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