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Peculiarities of Compositions and Formation Environments of Potassium and Potassium-Magnesium Rocks From the Pogozhskaya Rhythmic Member in The Northwestern and the Northeastern Parts of the Caspian Slope Zone

Authors: Moskovsky G. A., Goncharenko O. P., Baiguzina A. Z.

The paper presents the results of composition examination of the uppermost of the Pogozhskaya rhythmic member from the northern near-slope fringes of the Caspian Region. The potassium-bearing horizon encountered there is determined to have resulted from the demineralization stage overlapping the carnallite and the bischofite stage deposits. In potassium salt accumulation, the major importance is attributed to the process of potassium ion concentration during the large-scale precipitation of salt-out halite associated with inflowing brine condensed to halite stage.

On the Role of the Salting-out Processes at the Final Stages of Halogenesis (the Case of the Gremyachinskoye Potassium-Salt Field)

Authors: Moskovsky G. A., Goncharenko O. P.

Investigation of the ≪productive≫ intervals in the Gremyachinskoye potassium-salt field shows the potassium and potassium-magnesium salt settling to have been accompanied with large-scale salting out of sodium chloride due to interaction of highly concentrated solutions from that part of the salt-generating basin with the low concentrated ones. The constantly arriving low concentrated brine was peculiar for high contents of sodium chloride. That has resulted in large-scale salting-out of halite as lenses, crusts and randomly shaped clusters.