The kinematic history of the Singhbhum Shear Zone

Sengupta, Sudipta ; Ghosh, S. K. (1997) The kinematic history of the Singhbhum Shear Zone Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, 106 (4). pp. 185-196. ISSN 0253-4126

PDF - Publisher Version

Official URL:

Related URL:


The progressive deformation of the Singhbhum Shear Zone (SSZ) involved the initiation of a mylonitic foliation, its deformation by three generations of reclined folds and superposition of two later groups of folds, i.e., a group of asymmetric folds with subhorizontal or gently plunging axes and a group of gentle and open, transverse and more or less upright folds. The occurrence of sheath folds and U-shaped deformed lineations indicate that the reclined folds were produced by rotation of fold hinges through large angles. The total displacement along the SSZ was compounded of displacements along numerous mesoscopic shear zones. The cleavages in the shear lenses and the mesoscopic shear zones cannot be distinguished as C and S surfaces. They have the same kinematic significance and were produced by ductile deformation, although there were localized discontinuous displacements along both sets,-of cleavages. A mylonitic foliation had formed before the development of the earliest recognizable folds. Its time of formation and folding could be synchronous, diachronous or partly overlapping in time in the different domains of the SSZ.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Shear Zone; Shear Lens; Mylonite; Sheath Fold; Deformed Lineation
ID Code:27150
Deposited On:08 Dec 2010 12:37
Last Modified:17 May 2016 10:25

Repository Staff Only: item control page