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Pyroclastic rocks in deposits of the potassic subformation of the Pripyat intracontinental palaeorift

Petrova N. S.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

2010

T. 36, z. 3

395-406

The paper presents characteristics of composition, structure and distribution pattern of tuffaceous interbeds of the Mid-Late-Famennian potassic subformation of the Pripyat intracontinental palaeorift (the Pripyat Trough, Belarus). Solid products of volcanic activity found there are proofs of significant volcanism influence/contribution on/to accumulation of salt deposits in the Pripyat Trough. Abundance of clastic material, its granulometric and mineralogical composition and distribution within the sedimentary area affected formation of lithological complexes. Interbeds of tuffaceous clays, occurring at 12 levels of the potassic subformation, suggest that the salt accumulation was accompanied with the volcanic processes. Pyroclastic rocks are represented by ash particles (morphologically well-preserved in some crystal-vitric tuffs), pumice, mineral crystals and lithoclasts.

Late Devonian magmatism in the Pripyat Palaeorift: a geodynamic model

Aizberg R. Y., Beskopylny V. N., Starchik T. A., Tsekoyeva T. K.

Geological Quarterly

2001

Vol. 45, No 4

349-358

Late Devonian magmatism in the Pripyat Trough, Belarus was associated with the development of the intraplate Pripyat-Donets Palaeorift. Magmatic rocks belong to an alkali-ultrabasic-alkali-basaltoid suite. These are represented by explosive, effusive, subvolcanic and volcanic facies. The magmatic activity and rock composition changes from the periphery to the axial part of the Pripyat Trough, corresponding to the general trend of destructive processes in the rifting zone. Geodynamically, the Pripyat alkali-ultrabasic rocks represent a series of magmatic suites of the Pripyat-Donets palaeovolcanic region coinciding with a zone of disappearance of Late Devonian divergence processes in the south-west of the East European Craton.