| Fault related microstructures: Slickenlines
(or striaes) represent mechanical striations
that develop during faulting. Slickenlines give the direction of
slip on fault planes. They are oriented by their pitch: the angle between the strike line (= an horizontal line on the fault plane) and the striae. The pitch can have any value in the range of 0 (horizontal striae) to 90º (striae perpendicular to the strike line). The picture below shows slickenlines on a fault plane in limestones. The fault is a dip slip fault since the pitch of the slickenlines is close to 90º. A trained eyes will also deduced the sense of motion, but we will see that later...
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