Singhbhum Shear Zone: structural transition and a kinematic model

Ghosh, S. K. ; Sengupta, Sudipta (1990) Singhbhum Shear Zone: structural transition and a kinematic model Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, 99 (2). pp. 229-247. ISSN 0253-4126

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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.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Shear Zone; Progressive Deformation; Rotation of Fold Hinges; Kinematic Model; Singhbhum Shear Zone; Deformed Lineation Pattern; Refolding
ID Code:27148
Deposited On:08 Dec 2010 12:37
Last Modified:17 May 2016 10:25

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