Abstract
Mesoscopic shear zones are well preserved in the gneisses around the Kolar Schist Belt, located in the eastern part of the northern granite—greenstone association of the south Indian Precambrian terrain. The majority of these shear zones are of ductile to brittle—ductile type with both dextral and sinistral senses of movement. The detailed geometry and large-scale mapping show that sinistral shear zones strike dominantly NW, whereas dextral shear zones strike dominantly NE and form a conjugate pair. The bisectors of statistically preferred orientations of these two sets of shear zones indicate that they developed in response to an E-W subhorizontal compression which can be correlated to the late stage of the F 2 folding seen inside the schist belt. Displacement vectors along these shear zones are invariably subhorizontal, precluding the possibility of overthrusting or underthrusting relationship between the schist belt and surrounding gneissic terrains. If the schist belt is a major shear zone, the displacement across it can not be more than 15 km.
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