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Facies and architecture analysis of the continental deposits of Klikov Formation, Hosín-Orty locality, Upper Cretaceous, České Budějovice Basin.
Kavková, Radana ; Martínek, Karel (advisor) ; Lojka, Richard (referee)
The Klikov Formation (Upper Cretaceous) represents the lowest stratigraphic unit of the South Bohemian basins. It provides record of continental deposits related to fluvial processes. Analysis of facies and architectures supplemented with paleocurrents data provided a basis for interpretation of depositional system exposed underground on the locality Hosín-Orty. In this study identifies sedimentary facies corresponding to high-energy river environmnent with dominance of traction current deposition are identified. Next to this, facies corresponding to low-energy deposition from suspension is preserved. From the perspective of architecture analysis depositional record represent active river channels and their fills eventuelly fills of abandoned channels. Low dispersion of paleocurrent values is consistent with a low-sinuosity river. Vertical aggradation of channels, dominance of river bars in channel-fill, downstream accretion, absence of ripples, point-bars, lateraly accreted patterns and floodplain deposits correspond with braided river environment. Stratigraphic units A, B, C, D, E, F corresponding to fluvial environment or environment of abandoned channel were distinguished. The direction of river flow is interpreted to northeast in unit A, and northwest in unit B, respectively. Autogenic and...
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Facies and architecture analysis of the continental deposits of Klikov Formation, Hosín-Orty locality, Upper Cretaceous, České Budějovice Basin.
Kavková, Radana ; Martínek, Karel (advisor) ; Lojka, Richard (referee)
The Klikov Formation (Upper Cretaceous) represents the lowest stratigraphic unit of the South Bohemian basins. It provides record of continental deposits related to fluvial processes. Analysis of facies and architectures supplemented with paleocurrents data provided a basis for interpretation of depositional system exposed underground on the locality Hosín-Orty. In this study identifies sedimentary facies corresponding to high-energy river environmnent with dominance of traction current deposition are identified. Next to this, facies corresponding to low-energy deposition from suspension is preserved. From the perspective of architecture analysis depositional record represent active river channels and their fills eventuelly fills of abandoned channels. Low dispersion of paleocurrent values is consistent with a low-sinuosity river. Vertical aggradation of channels, dominance of river bars in channel-fill, downstream accretion, absence of ripples, point-bars, lateraly accreted patterns and floodplain deposits correspond with braided river environment. Stratigraphic units A, B, C, D, E, F corresponding to fluvial environment or environment of abandoned channel were distinguished. The direction of river flow is interpreted to northeast in unit A, and northwest in unit B, respectively. Autogenic and...
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Low sinuosity rivers with example of sediments of klikov formation from locality Hosín-Orty, Late Crataceous, České Budějovice basin
Kavková, Radana ; Martínek, Karel (advisor) ; Opluštil, Stanislav (referee)
The literature research part of this bachelors thesis is devoted to the definition of river styles, namely to those with low sinuosity. The aim was the description of types of deposits and diagnostic features of these rivers. Available literature, especially scientific papers devoted to fluvial sedimetology served as the sources of information for this study. Summarization of processes and products of these river styles and definition of different approaches to their study were achieved. Practical part of the thesis explores the fluvial style in Hosín-Orty region. The aim was to interpret sedimentary environment. Litology of four selected outcrops, from which fotomozaics were prepared, was studied in detail. Facies and architectural elements recognized in outcrops were defined. Furthermore, measured sedimentary sections of these outcrops were delineated. Character of sedimentary structures and the sedimentary body geometries point to river environment of sedimentation. Low spread of palaeocurrent vectors is interpreted as low sinuosity river system. The absence of structures typical for anastomosing river style finally allow us to interpret the river environment as braided. Powered by TCPDF (www.tcpdf.org)
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