Carbon, oxygen, and sulfur isotope compositions and model of the Silurian rock formation in northwestern Belarus
- Authors: Makhnach A.A.1, Kruchek S.A.1, Pokrovsky B.G.2, Strel’tsova G.D.1, Murashko O.V.1, Petrov O.L.2
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Affiliations:
- Research and Production Center for Geology
- Geological Institute
- Issue: Vol 53, No 1 (2018)
- Pages: 1-13
- Section: Article
- URL: https://journals.rcsi.science/0024-4902/article/view/162621
- DOI: https://doi.org/10.1134/S0024490218010054
- ID: 162621
Cite item
Abstract
The paper describes the results of study of the Silurian clayey–carbonate rocks ranging from the Telychian Stage (Llandovery) to the Gorstian Stage (Ludlow) recovered by the Borehole Davtyuny 3k in northwestern Belarus. Rocks of the Sheinwoodian Stage demonstrate a positive excursion of δ13C with amplitude of 4.7‰, marking the Ireviken biotic event recorded in the global chemostratigraphic curve. Values of δ18O for the carbonate material in the studied section (25.5–29.2‰ SMOW) are close to those for Silurian rocks from the Baltic region, Scandinavia, Ukraine, Poland, and Canada. The whole section contains postsedimentary gypsum as nodules and the infilling of fissures and fenestrae. Values of δ34S in gypsum (21.3–26.7‰ CDT) are close to those for the Silurian rocks on the Phanerozoic isotope plot. The formation of gypsum was related to a partial development of the supralittoral environment over the sublittoral and littoral clayey–carbonate substrate. The seawater accumulated in lowlands of the supralittoral plain after storms was intensely concentrated during arid conditions and accumulated in the clayey–carbonate sediment. The subsequent underground evaporation promoted the formation of gypsum as nodules in the unlithified sediments and the infilling of fissures and fenestrae in the lithified rocks.
About the authors
A. A. Makhnach
Research and Production Center for Geology
Author for correspondence.
Email: amahnach@geology.org.by
Belarus, ul. akad. Kuprevicha 10, Minsk, 220141
S. A. Kruchek
Research and Production Center for Geology
Email: amahnach@geology.org.by
Belarus, ul. akad. Kuprevicha 10, Minsk, 220141
B. G. Pokrovsky
Geological Institute
Email: amahnach@geology.org.by
Russian Federation, Pyzhevskii per. 7, Moscow, 119017
G. D. Strel’tsova
Research and Production Center for Geology
Email: amahnach@geology.org.by
Belarus, ul. akad. Kuprevicha 10, Minsk, 220141
O. V. Murashko
Research and Production Center for Geology
Email: amahnach@geology.org.by
Belarus, ul. akad. Kuprevicha 10, Minsk, 220141
O. L. Petrov
Geological Institute
Email: amahnach@geology.org.by
Russian Federation, Pyzhevskii per. 7, Moscow, 119017