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Applied Salt-Rock Mechanics. The in-situ behavior of salt by C. A. Baar

By C. A. Baar

Utilized Salt-Rock Mechanics 1

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Extra resources for Applied Salt-Rock Mechanics. The in-situ behavior of salt rocks

Sample text

One important difference emerged: the "competent" members of evaporite formations — limestone/ dolomite, anhydrite, marl and shale — responded by rupture to excess deformation. , during diapirism, the individual fragments suffered hardly any textural changes. Lotze (1957, fig. 171) made an attempt at reconstruction of the original thickness of an anhydrite bed in a salt dome; the individual fragments are scattered throughout adjacent salt masses. Thin seasonal laminae of the type shown in Fig. 2-18 usually were not destroyed during extensive flowage in salt domes.

237) refer to obsolete hypotheses which call for "tectonic compression" as the cause of complex folding and brecciation of salt beds. , p. 243): "The upwelling of salt domes may be caused almost entirely by the load of the overburden. At depths of between 2500 and 3000 m the temperature is about 100°C and the pressure over 600 kg per cm2. Under these conditions salt is very plastic; it is in fact about as soft as butter on a hot summer's day. " Their explanation of salt dome formation appears to be in agreement with Trusheim's (1960) halokinesis.

Richter-Bernburg's (1955) photographs show textures of anhydrite cores from "rapidly sedimented anhydrite banks" which formed according to Fig. 2-17; in shallow water, the relative concentration of CaS0 4 becomes higher than in deep water because of the greater relative volume loss by evapora­ tion; assuming water depths of 20 and 200 m, respectively (hi and h2 in Fig. 2-17), and yearly evaporation of 2 m of water, the loss in volume is 10% and 1% at the respective locations. As a result, the more concentrated water will precipitate anhydrite in shallow areas and flow into the deeper part of the basin, where eventually halite crystallizes due to cooling (see Fig.

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