Monday, April 6, 2015

Salt Structure chapter 1

Salt and associated evaporites are quite common in many sedimentary sequences. Salt has a low density (2.2 gm/cm3), lower than that of most other commonly occuring sediments. When deposited in sufficiently thick layers, it becomes inherently unstable if it is buried; and a density inversion between the overburden and salt is achieved. In such circumstances, salt flowage is initiated and passes through threee widely recognized stages of pillowing, diapirism, and postdiaprism. Bishop (1978) discusses the complex interaction between depositional history of the surrounding sediments and growth of salt structure. Controversy surrounds the question of whether the dominant processes in development of a salt diapir involve intrusion or extrusion of the salt.

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