Ductile Shear Zone with Sigmoidal Foliation

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Gabbroic igneous pluton deformed by right-lateral ductile shear zone, Griminish Point, Outer Helindes, NW Scotland. The approximate shear zone boundaries are shown in yellow. Sigmoidal foliation (restricted to the shear zone) is shown in blue. The geometry of the sigmoidal foliation indicates right-lateral shearing. R&H photo.
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