GEOLOGICAL AND PHYSICAL-CHEMICAL CHARACTERISTICS OF LOWER PALEOZOIC DEPOSITS OF VOLHYNO-PODILLYA, WESTERN UKRAINE
Journal Title: Biuletyn Państwowego Instytutu Geologicznego - Year 2012, Vol 449, Issue 449
Abstract
The 340 to 1102 m thick multi-facies sequence was deposited during the Silurian at the Volhyno-Podillya margin of the East European Platform. The open shelf facies bordered from the west by a barrier formed by reefs, bioherms, crinoids, or by banks of detrital sediments (at the boundary of the lagoon and the open sea). Lagoonal deposits are represented by thin intercalations of sedimentary dolomites, sometimes with intercalations of organogenic limestones, marls, argillites, gypsum and anhydrite. Within the open shelf and slope facies, marls, lumpy clayey limestones and argillites are prevailing. A zone of reefal buildups has a rather complicated and insufficiently investigated structure. The exclusively terrigenous deposits of the submerged part of the continental slope form the entire Silurian sequence in the central part of the L’viv Depression and in the Carpathian Foredeep.Open porosity of the Silurian argillites vary from 0.6 to 2.4% and they are almost impermeable (less than 0.001 μm[sup]2[/sup]•10[sup]–3[/sup]). Volume weight ranges between 2.64 and 2.8 g/cm[sup]3[/sup]. Natural radioactivity of rocks varies from 9 to 18 mcR/hr, apparent electric resistance is 20–154 Ohmm, interval time of longitudinal waves spreading is 126–365 μcs/m. TOC content, determined in 21 samples using the thermal analysis, varies from 0.75 to 2.38%. The composition of volatiles of fluid inclusions and closed pores of argillites shows the predominance of methane (up to 100 vol. %). In deeper horizons, carbon dioxide, nitrogen and ethane (a few percent) appear.
Authors and Affiliations
Ihor KUROVETS, Danylo DRYGANT, Serhiy KUROVETS, Yuriy KOLTUN
Keywords
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