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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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It is extremely important to ensure, by appropriate development of extraction mining areas, that only plastic reactions occur in the salt rocks between extracted areas and competent formations. This is of vital importance in conventional mines where an impermeable seal must be maintained against waterbearing formations above or below the mine workings; for details, see Volume 2. 1 is based on observations in severely deformed evaporite sequences. One important difference emerged: the "competent" members of evaporite formations — limestone/ dolomite, anhydrite, marl and shale — responded by rupture to excess deformation.

The subsequent wave-front-like growth of the saltstock families took place in a purely halokinetic way, that is, by the move­ ment of salt under the influence of gravity. 3 mm a year" (Sannemann, 1968, p. 261). 3 Diapirism Modern investigators appear in agreement regarding the need for a trigger­ ing mechanism to initiate salt diapirism. Tectonics movements, resulting in faulting of competent formations are usually invoked. It may be emphasized with Kupfer (1974) — see preceding sub-section — that expansion tectonics Fig.

Wardlaw and Reinson (1971) published numerous photos of anhydrites with similar textures; the anhydrites formed on the top and at the slopes of carbonate banks and reefs in the Prairie Evaporite basin of western Canada: 4 'transitions from agitated open-marine waters to quiet restricted conditions apparently occurred abruptly, as did changes from oxidizing to reducing conditions; in an offbank direction, halite appears to be a facies equivalent of anhydrite". Confirming in this way earlier conclusions based on bromine investigations (Wardlaw, 1963), these authors reject the sabkha hypothesis proposed by other writers, emphasizing the similarity between their findings and those of Richter-Bernburg (1955).

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