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From Clastics to Carbonates and Black Shales: Deciphering Sedimentary Continuity and Discontinuity in the Devonian Landscape of the Volga-Ural Petroleum Province
Version 1
: Received: 14 March 2024 / Approved: 15 March 2024 / Online: 18 March 2024 (09:00:44 CET)
How to cite:
Silantiev, V.V.; Miftakhutdinova, D.N.; Nurgalieva, N.G. From Clastics to Carbonates and Black Shales: Deciphering Sedimentary Continuity and Discontinuity in the Devonian Landscape of the Volga-Ural Petroleum Province. Preprints2024, 2024030961. https://doi.org/10.20944/preprints202403.0961.v1
Silantiev, V.V.; Miftakhutdinova, D.N.; Nurgalieva, N.G. From Clastics to Carbonates and Black Shales: Deciphering Sedimentary Continuity and Discontinuity in the Devonian Landscape of the Volga-Ural Petroleum Province. Preprints 2024, 2024030961. https://doi.org/10.20944/preprints202403.0961.v1
Silantiev, V.V.; Miftakhutdinova, D.N.; Nurgalieva, N.G. From Clastics to Carbonates and Black Shales: Deciphering Sedimentary Continuity and Discontinuity in the Devonian Landscape of the Volga-Ural Petroleum Province. Preprints2024, 2024030961. https://doi.org/10.20944/preprints202403.0961.v1
APA Style
Silantiev, V.V., Miftakhutdinova, D.N., & Nurgalieva, N.G. (2024). From Clastics to Carbonates and Black Shales: Deciphering Sedimentary Continuity and Discontinuity in the Devonian Landscape of the Volga-Ural Petroleum Province. Preprints. https://doi.org/10.20944/preprints202403.0961.v1
Chicago/Turabian Style
Silantiev, V.V., Dinara N. Miftakhutdinova and Nouria G. Nurgalieva. 2024 "From Clastics to Carbonates and Black Shales: Deciphering Sedimentary Continuity and Discontinuity in the Devonian Landscape of the Volga-Ural Petroleum Province" Preprints. https://doi.org/10.20944/preprints202403.0961.v1
Abstract
Analyses of the three predominant types of sedimentation – clastic, carbonate and black shale – revealed their discontinuity/continuity in different facies environments of the Middle and Late Devonian of the central part of the Volga-Urals petroleum province, namely (1) in depressions, both condensed and non-condensed, (2) on the slopes of depressions and (3) in shallow water environments represented by tectonic arches or localised biohermal uplifts. The regional zonation of conodonts, correlated with the global chronostratigraphic scheme, substantiates the stratigraphic completeness of the general Devonian sequence in this area. In particular, the sedimentation of organic-rich black shales, traditionally considered as source rocks, lasted more than 29 million years, starting from the Late Eifel and ending at the Devonian-Carboniferous boundary. There was only one hiatus in the deposition of both black shales and carbonate sediments, lasting about 2.5 million years at the end of the Frasnian. That interval is dominated by clastic sediments, which are considered to be the most productive reservoirs of the Volga-Ural province. In the time interval from the beginning of the Eifel to the end of the Frasnian (about 17 Ma), (a) clastic sediments show the highest accumulation rates; (b) the most complete sequences occur in depressions; and (c) arches and uplifts show the most significant gaps in the geological record. During Famennian, (a) clastic sedimentation has completely ceased; (b) differences between the slopes of troughs and shallow-water environments have diminished, resulting in stable accumulation of carbonate sediments in both settings; (c) the decrease in sequence thickness (up to 50 m) in depressions suggests reduced accumulation rates of deep-water organic-rich black shales. The results help to understand the complex spatial relationship between different coexisting sedimentation types and focus attention to the incompleteness of the geological record in different environments.
Environmental and Earth Sciences, Geophysics and Geology
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
