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

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Seasonal temperature changes remained effective regardless of the brine depth, as shown by Dellwig (1955) for the Salina salt of Michigan; the salt was depos­ ited in layers or bands of three distinct types: (1) cloudy layers of inclusionrich pyramidal shaped hopper crystals of halite; (2) clear layers of inclusionfree halite; and (3) laminae of anhydrite and dolomite. In cases where large amounts of non-marine material were carried into an evaporating basin, such material sedimented with the laminae of anhydrite and dolomite, see p.

Fig. 2-22 and 2-23 (Lotze, 1957, figs. 196 and 198) are of particular signi­ ficance. They show dolomitic marl beds, and anhydrite beds, ripped apart by tectonic forces related to the deepening of the Upper Rhine graben after deposition and consolidation of the evaporites. In sharp contrast to such elastic reaction, the salt layers deformed plastically, closing the gaps as they developed and maintaining in this way the impermeability of the evaporite sequence. Many more figures in Wagner's (1955) and Lotze's (1957) studies as well as in many other publications demonstrate the plastic reactions of salt rocks in cases where beds of dolomite or anhydrite responded elastically, by frac­ ture, to tensional or shear stresses.

LOcm. —i Fig. 2-12. Petrographic structures in Prairie Evaporite salts. ) Mineral identification: halite (white), sylvite (coarse stipple), carnallite (fine stipple), insolubles (black). Note: in cores A and C, a clay layer apparently terminated the seep­ age of brines from which sylvite and carnallite crystallized; in core if, insolubles, sylvite, and carnallite, in upward sequence, are occupying irregular pockets and vertical cleavage planes of large halite crystals. 31 Fig. 2-12 (after Wardlaw, 1968) reveals the sequence of such events in the Prairie Evaporites of Saskatchewan: highly concentrated brines of phase IV of Fig.

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