Abstract
In this paper, analysis of joints developed in folded quartzites of Galudih area, Jharkhand State (India) is presented. The joint pattern indicates that NE–SW joints are the dominant set. These have developed perpendicular to the NW–SE trending axial planes and hinges of the folds in quartzites implying that they are cross-joints. Plumose structures are observed on NE–SW joint surfaces that indicate their formation by extension perpendicular to the joint face. It is inferred that this extension in NW-SE direction is related to NE–SW compressional stresses that resulted in folding of the quartzite by flexural-slip mechanism.
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