By C. A. Baar
Utilized Salt-Rock Mechanics 1
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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. 2-6 for confirmation by bromine profiles). 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".
2-25, eastern part. 1 = basement; 2 = Triassic and Jurassic; 3 = Eocene; 4 = Oligocene; a. salt sequence with potash beds, b. Middle, c. Upper; 5 = basalt dyke; 6 = Quarternary. 50 patible with the doctrines of sea-floor spreading and plate tectonics, but not proof; several other hypotheses are equally viable". 2 Folding Large-scale folding of evaporite sequences has had little effect on the salt members, as would be expected from their plasticity. The contrasting behav ior of competent members such as anhydrite or dolomite beds is demon strated in Fig.
In many cases, the secondary origin of relative thin layers of halite, sylvite or carnallite is not as evident. This holds, for example, for layers of pure sylvite in sylvinitic potash beds, for layers of pure carnallite in, above or below potash beds, and for layers of rare minerals such as bischofite and tachhydrite which are considered secondary by most investigators. Also, the conversion of layers of kieserite into polyhalite and finally into anhydrite, under conditions as shown in Fig. , Baar (1960).
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