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In a study of the dynamical interplay of salt and sediment using buoyancy pressure as the driving force, we find that (a) salt cannot become buoyant until a critical depth of sediment is reached corresponding to a porosity of 25-30%, (b) viscosity plays virtually no role in the development of diapiric salt structures on a geologic time scale, (c) both overpressure and the lateral cohesive strength of overlying sediments retard the development of a dome by delaying the initiation of diapirism and suppressing the later growth of the salt structure, (d) the formation of a "mushroom cap" on a diapiric structure can be caused both by differential impedance provided by the sediments and by differential buoyancy of salt, although relative importance of the 2 mechanisms is unknow at present, and (e) the draping of sediments over a diapiric structure and rim synclinal development can be modeled easily provided that the sediments
are of low cohesive strength. The influence of sediment strength and previous sediment faulting on the development of draped sediments and rim synclinal structures remain outstanding concerns.
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