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Makhnach A.A.,Belarussian Research Geological Prospecting Institute | Kuleshov V.N.,Russian Academy of Sciences | Vinogradov V.I.,Russian Academy of Sciences | Pokrovsky B.G.,Russian Academy of Sciences | And 3 more authors.
Lithology and Mineral Resources | Year: 2013

Peculiar features of evaporitic process at the stage of potassium accumulation are considered on the basis of carbon and oxygen isotope data on carbonate rocks and sulfur isotope data on anhydrite from the Famennian potassium-bearing subformation of the Starobin potassic salt deposit in the Pripyat trough. It was found that potassium accumulation was accompanied by the influx of continental waters and highly concentrated brines, while the formation of thick salt-free units was related to the replenishment of fresh seawater to the basin. © 2013 Pleiades Publishing, Ltd.

Bujakaite M.I.,Russian Academy of Sciences | Vinogradov V.I.,Russian Academy of Sciences | Petrova N.S.,Belarussian Research Geological Prospecting Institute | Mikhailov N.D.,Belarussian Research Geological Prospecting Institute | And 3 more authors.
Lithology and Mineral Resources | Year: 2012

The results of Rb-Sr and K-Ar isotope studies of the Famennian upper salt and suprasalt complexes sampled from the core material of exploratory boreholes drilled at the northwestern margin of the Pripyat Trough (Belarus) are presented. The suprasalt and saliferous portions of the sequence define an age of approximately 470 Ma. Despite multiple reworking of the material, we interpret this value as preservation of the provenance "memory." Regardless of the Sr content in sample, the strontium isotope ratios obtained for low-Rb minerals (celestine, carbonate, and halite) varies throughout the section within 0. 7083-0. 7095, indicating the preservation of some primary features of the matter. The lowest isotope values obtained are slightly higher than those inferred for the upper Famennian. This fact confirms the concept that the studied complex was formed in a shallow-water setting. Data on sylvites show that the present-day isotopic characteristics of potassium salts were formed significantly later. © 2012 Pleiades Publishing, Ltd.

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