By C. A. Baar
Utilized Salt-Rock Mechanics 1
summary: utilized Salt-Rock Mechanics 1
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Am. Spec. , 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.
Fig. 2-33 (Lotze, 1957, fig. 124) represents a section of the Leine graben of West Germany; as several potash mines have been operating in this area, the geological conditions as shown have been known for many decades. Salt intrusion into the faults contributed considerably to the formation of this graben zone. Fig. 2-32. Schematic sections, Murguia salt dome, Spain. ) Salt (black) with clay laminae. Interpretation of deformations: a. intermediate; b. final state of deformations; c. directions of flow of salt (stippled) indicated by arrows, the dashed arrows showing the movements in overlying formations.
There is no danger of mine flooding, provided that appropriate action is taken immediately. Detailed data regard ing the actual development of such inflows is presented in Chapter 4. , those which result from the conversion of carnallite — need to be triggered by tectonic events 45 Fig. 2-22. Intrusion of salt into fractured marl. ) Rock salt layers (black) with marl-anhydrite laminae (dashed) flowed into fracture as it opened in dolomitic marl with knots and bands of anhydrite. Other fractures filled with fibrous salt.