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Block Fault


Block Fault one type of normal faulting in which the crust is divided into structural or fault blocks of different elevations and orientations. It is the process by which block mountains are formed. Bangladesh covers a large part of the bengal basin, which has been created by crustal extension and rifting during Jurassic to Early Cretaceous in association with a passive continental margin followed by Tertiary crustal collision, subduction and the orogeny of the Indo-Burmese Fold Belt in the east and northeast. The basic structural configuration of Bangladesh is thus characterised by wrenched compressional folds in the east over a Cretaceous oceanic crust and an extensional block faulted continental crust in the west. An E-W striking Dauki Fault Zone with block faulted Palaeogene sediments of the Northern Foreland Shelf and block faulted Piedmont deposits of Plio-Pleistocene age in the susang hills can be considered as a structural unit of regional importance from E-W. [Sifatul Quader Chowdhury]

See also fault.