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The AAPG/Datapages Combined Publications Database

Journal of Petroleum Geology

Abstract

Journal of Petroleum Geology, Vol.14, No.2, pp. 117-142, 1991

©Copyright 2000 Scientific Press, Ltd.

GRAVITY OVERTURNS, EXTENSION, AND BASEMENT FAULT ACTIVATION

H. Koyi*

* The Hans Ramberg Tectonic Laboratory, Institute of Geology, University of Uppsala, Box 555, S- 751 22 Uppsala, Sweden.

Abstract

Rayleigh-Taylor instabilities occur when low-density layers of viscous fluids are overlain by denser layers. Gravity overturn of such instabilities leads to the rise of the unstable light (source) fluid as diapirs (e.g. of salt) through the denser (overburden) layers (e.g. of clastic sediments). Lateral extension or movements of faults in the bottom boundary at any stage during such gravity overturns are expected to have a great effect on the geometry, growth rate and location of any salt structures.

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