By C. A. Baar

Utilized Salt-Rock Mechanics 1

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

Sample text

On the basis of evidence from underground observations in numerous potash mines, Baar (1958) suggested the mechanism schematized in Figs. 2-19 and 2-20: due to the loss of volume of carnallitic salt in the course of alterations as shown in Fig. 2-16, lateral deformations caused its brecciation, and the folding of sylvinite; brecciated carnallite may also have been squeezed into bed separations in the overlying and underlying rock-salt strata, into shear fractures, and into voids between blocks of anhydrite.

However, in shallow water the conditions were different, not only during deposition and diagenesis of salt rocks as documented in Figs. 2-12 and 2-13, 37 or during sabkha conditions, if sabkha conditions were at all as important in the early phases of evaporite deposition as emphasized in recent publica­ tions. Richter-Bernburg (1955) in particular has published convincing evi­ dence of anhydrite and dolomite textures which show most of the petrographic characteristics ascribed to sabkha deposits.

88 (1968); the reader is particularly referred to the papers by Liechti, Tortochaux, Bentor, Stöcklin, Dunnington. The mechanism of intrusion of Gulf Coast salt has been dealt with in detail by Kupfer (1970, 1974) with reference to numerous other publications. Fig. 2-34 (Lotze, 1957, fig. 164) illustrates schematically the type of flowage structures encountered in North-German salt domes; evaporites which had been pushed above the present level of the top of the dome, were dissolved by groundwater, leaving residues consisting mainly of gypsum frag­ ments and insoluble material.

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