Development of grabens and associated fault-drags: An experimental study |
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| Authors: | Sugata Hazra |
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| Institution: | (1) Department of Geological Sciences, Jadavpur University, 700032 Calcutta, India |
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| Abstract: | Experiments on extensional faulting were performed with semi-brittle talc-sand beds resting on a ductile clay base. The experiments
show that the development of graben in the talc-sand beds is controlled by the deformation in the ductile basement. Graben-like
structures form only when there is a non-uniform stretching in the basement. Uniform extension at the basement level fails
to produce any such structures. Grabens initiate as large synclinal structures (sag). The sag is generated either by a downward
flexing of the talc-sand bed on a ductile basement or by non ****-uniform thinning of beds. Listric master faults bounding
the grabens intersect the basement at high angles. The master faults that initiate as curved shear planes rotate further with
continued extension. At the initial stage, the graben structures are associated with normal drags, and with progressive deformation,
drag patterns change from normal to a reverse one. |
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| Keywords: | Fault graben reverse drag basement ductile brittle |
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