Singhbhum Shear Zone: Structural transition and a kinematic model |
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| Authors: | S K Ghosh Sudipta Sengupta |
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| Institution: | (1) Department of Geological Sciences, Jadavpur University, 700032 Calcutta, India |
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| Abstract: | The northern fold belt away from the Singhbhum Shear Zone displays a set of folds on bedding. The folds are sub-horizontal
with E-W to ESE striking steep axial surfaces. In contrast, the folds in the Singhbhum Shear Zone developed on a mylonitic
foliation and have a reclined geometry with northerly trending axes. There is a transitional zone between the two, where the
bedding and the cleavage have become parallel by isoclinal folding and two sets of reclined folds have developed by deforming
the bedding—parallel cleavage. Southward from the northern fold belt the intensity of deformation increases, the folds become
tightened and overturned towards the south while the fold hinges are rotated from the sub-horizontal position to a down-dip
attitude. Recognition of the transitional zone and the identification of the overlapping character of deformation in the shear
zone and the northern belt enable the formulation of a bulk kinematic model for the area as a whole. |
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| Keywords: | Shear zone progressive deformation rotation of fold hinges kinematic model Singhbhum Shear Zone deformed lineation pattern refolding |
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