Research and Production Center for Geology

Minsk, Belarus

Research and Production Center for Geology

Minsk, Belarus
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Narkiewicz M.,Polish Geological Institute NRI | Narkiewicz K.,Polish Geological Institute NRI | Krzeminska E.,Polish Geological Institute NRI | Kruchek S.A.,Research and Production Center for Geology
Palaios | Year: 2017

Conodont apatite from a shallow-marine Middle Devonian transgressive unit has been investigated in five borehole sections representative of the epicontinental Belarussian Basin located in a near-equatorial setting. The transgression is related to the onset of the late Eifelian Kačák Event, an important biotic episode recorded worldwide. The δ18Oapatite data were acquired using the secondary ion mass spectrometry (SHRIMP) technique. The mean corrected values in the studied sections are in the range 19.8‰ to 20.2‰, significantly exceeding the values measured for late Eifelian low-latitude open marine basins. This can be explained by higher average δ18Oseawater levels related to elevated seawater salinities in the Belarussian epeiric basin, in agreement with the presence of impoverished marine fauna. The intra-specimen δ18O variability, with differences ranging up to 2.6‰ in some specimens, can be explained by fluctuating δ18Oseawater and, to a smaller degree, temperature variations in the Belarussian inland sea under a monsoonal climate. The present results demonstrate that local paleoclimate and epeiric paleogeography may considerably obscure the global climatic signature of the conodont apatite isotopic record. Copyright © 2017, SEPM (Society for Sedimentary Geology).


Makhnach A.,Research and Production Center for Geology | Shimanovich V.,Research and Production Center for Geology | Streltsova G.,Research and Production Center for Geology | Mikhaylov N.,Research and Production Center for Geology
Geological Quarterly | Year: 2014

Anhydrite is widespread in the Prypiać Trough in the form of beds and nodules in the Subsaliferous Terrigenous and Carbonate formations (Eifelian and Frasnian), the Lower Saliferous Formation (Frasnian), the Intersaliferous and Upper Saliferous formations (Famennian). It is also present in the Asselian and Sakmarian (Lower Permian) deposits of the trough. The anhydrite is grey, blue, pink and orange. It has massive and, more rarely, horizontal bedding, and a fine- and micro-crystalline structure. Gypsum extends widely across the Orša Depression, Žlobin and Latvijas Saddles and partly in the Belarusian Anteclise, where it lies within the Eifelian deposits. It is also found in the Frasnian strata of the North-Prypiać Shoulder. As a component of facial analogue of the Upper Saliferous Formation gypsum forms the Bryniou deposit in the west of the Prypiać Trough. This mineral is also observed in the Oversaliferous Formation (Famennian) and in the Asselian and Sakmarian strata of the trough. There are spar, saccharoidal, alabastrine and selenitic varieties of gypsum. A medium to coarse crystalline structure is typi cal. The gypsum is grey, pink, yellow or orange. © 2014 Polish Geological Institute. All rights reserved.

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