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Depositional regime and genetic stratigraphy of Coniacian clastics, NW
Nádaskay, Roland ; Uličný, David (advisor) ; Bábek, Ondřej (referee)
This thesis, which is focused to Coniacan clastic deposits of NW-part of Bohemia, presents dual approach to the submitted topic: 1) field studies of sedimentary architectures, facies and structures in the vicinity of Kytlice and Sloup v Čechách villages, and 2) subsurface research based on available well-log data. The second part comprise also the area of Cvikov, previously sedimentologicaly explored by D. Uličný. Sedimentological field work revealed the presence of an assemblage of sedimentary facies typical for coarse-grained Gilbert-type deltas. As for the sedimentary architectures, these deltas resemble main geometrical type of delta-bodies of the Bohemian Cretaceous Basin according to Uličný (2001): shallow-water (L), and deep-water (H) deltas, respectively. Available field data allowed a consideration of a presence of transitional type, as well. The latter is typical for relatively high-angle foresets, but, in contrary, relatively small thickness. Sedimentary processes in the delta environment are governed by strong influence of tidal currents, responsible for significant reworking and redistribution of a clastic material from a fluvial input. Other factor that governed the character of sedimentation this milieu, are gravitational process that used to operate mailny on steep foresets of...
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Depositional regime and genetic stratigraphy of Coniacian clastics, NW
Nádaskay, Roland ; Uličný, David (advisor) ; Bábek, Ondřej (referee)
This thesis, which is focused to Coniacan clastic deposits of NW-part of Bohemia, presents dual approach to the submitted topic: 1) field studies of sedimentary architectures, facies and structures in the vicinity of Kytlice and Sloup v Čechách villages, and 2) subsurface research based on available well-log data. The second part comprise also the area of Cvikov, previously sedimentologicaly explored by D. Uličný. Sedimentological field work revealed the presence of an assemblage of sedimentary facies typical for coarse-grained Gilbert-type deltas. As for the sedimentary architectures, these deltas resemble main geometrical type of delta-bodies of the Bohemian Cretaceous Basin according to Uličný (2001): shallow-water (L), and deep-water (H) deltas, respectively. Available field data allowed a consideration of a presence of transitional type, as well. The latter is typical for relatively high-angle foresets, but, in contrary, relatively small thickness. Sedimentary processes in the delta environment are governed by strong influence of tidal currents, responsible for significant reworking and redistribution of a clastic material from a fluvial input. Other factor that governed the character of sedimentation this milieu, are gravitational process that used to operate mailny on steep foresets of...
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Soft-sediment deformation structures and their relation to palaeoseismicity
Nádaskay, Roland ; Uličný, David (advisor) ; Bábek, Ondřej (referee)
This work is focused on soft-sediment deformation structures, often called synsedimentary deformation structures (SSDS). Theoretical part of the work consists of description of these structures and processes of their genesis. The main processes which lead to the formation of SSDS are fluidization and liquefaction. Furthermore we discuss the role of trigger processes, which can be divided to seismic and non-seismic. In many cases, the formation of SSDS is connected with seismicity, so the important topic is description of the wider group of deformation structures called "seismites". In this part, the relation between SSDS and seismites and the principles of their distinction are also discussed. Second part of the thesis contains results of field work in the area of Most Basin. The aim of the field work is to analyze SSDS within the sediments of Bílina Delta and consider they are seismogenic or non-seismogenic. In case of seismogenic SSDS, there is a possibility for palaeoseismic reconstruction in the certain area.
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Depositional architectures, stratigraphy, and depositional regime of Upper Turonian sandstone bodies, northwestern part of the Bohemian Cretaceous Basin
Vacková, Lenka ; Uličný, David (advisor) ; Bábek, Ondřej (referee)
This diploma thesis presents a synthesis of fieldwork and well-log data of the Upper- Turonian sandstone bodies in the northwestern part of the Bohemian Cretaceous Basin. There was no previous research based on method of the sequence stratigraphy and correlation well-logs. I made 13 measured sedimentological cross-sections that were correlated to stratigraphical cross section along depositional dip and strike. Structures of the Upper Turonian sandstones (genetic sequences TUR 5 - 7) are dominated by trough cross bedding that migrate on a slightly inclined delta slope (1 - 5ř). The main direction of paleocurrents is towards SE or E. The analysis of thicknesses of parasequences (for TUR 4 - TUR 7) gives trend of thinning parasequences through time. Increasing content of the potassium is evident within sequences TUR 4 to TUR 7. It is independent on the grain-size, but indicates rapid transport from the source area.
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