National Repository of Grey Literature 14 records found  1 - 10next  jump to record: Search took 0.01 seconds. 
Short-term cyclic paleoenvironmental variations in Middle Turonian hemipelagic deposits, Bohemian Cretaceous Basin
Voženílková, Kristýna ; Uličný, David (advisor) ; Chadimová, Leona (referee)
The sedimentary record of the Turonian substage (Upper Cretaceous) offers an opportunity to examine climatic variations in a time of peak greenhouse climate. In the Bohemian Cretaceous Basin, recent cyclostratigraphic studies examined the cyclic variations of sedimentary environments of the Lower and Upper Turonian, while the cyclostratigraphy of the Middle Turonian substage has remained less understood. This thesis applied methods of spectral analysis to well logs and elemental composition data from several boreholes located in the central part of the Bohemian Cretaceous Basin, in order to better understand the environmental variations of the Middle Turonian substage and their possible astronomical forcing. A short eccentricity (~100 kyr) signature has been found in well log data, as well as the carbonate content of the Bch-1 borehole section and correlated over more than 20 km within the study area. Biogenic carbonate production is considered to be the cause of astronomically controlled cyclicity in content of Ca (proxy for CaCO3). For most of the substage, the carbonate cyclicity was shown to be decoupled from clastic sediment input variations, except the basal part of the Middle Turonian succession where clastic proxies are in phase with carbonate variations. It is proposed that the...
Depositional architectures, stratigraphy, and depositional regime of Lower-Middle Turonian sandstone bodies, northwestern part of the Bohemian Cretaceous Basin
Skopcová, Monika ; Uličný, David (advisor) ; Čech, Stanislav (referee)
Sandstone bodies of the Lower and Middle Turonian well exposed in the northwestern part of the Bohemian Cretaceous Basin represent deposits of the coarse-grained deltas. Aim of this paper is to interpret the architectures, stratigraphy and depositional regime of these bodies. The main architectural elements are clinoforms which show intermediate dip 4ř to 5ř of the delta slope and the direction of the progradation of the delta to the west-southwest. Correlation of the lithological profiles with the well - log data provided the stratigraphic classification of the outcrops in the studied area mostly to the genetic sequence TUR2. Correlations in one of the two stratigraphic cross - sections revealed the existence of the second delta body prograding into the basin from Most - Teplice Palaeohigh during TUR1. Detailed study of the sedimentary structures in the outcrops show high degree of reworking of foresets by tidal generated current. Two main directions of the paleocurrents results from the analysis - dominant current to the NW and subordinate current to the SE - SSE.
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...
Stratigraphic corelation between nearhsore and hemipelagic lithofacies - sedimentological, geochemical, and geophysical criteria
Bohadlo, Jan ; Uličný, David (advisor) ; Kumpan, Tomáš (referee)
This thesis summarizes the usage of geochemical proxy parameters and well logs for determination of sedimentation conditions and their changes in filling of sedimentary basins with emphasis on stratigraphic correlation between nearshore and hemipelagic strata. Subsequently an application of the methodology is demonstrated on core and well log data from the Upper Turonian Bohemian Cretaceous Basin (4420-G and BCH-1 wells), where accurate correlation could lead to better understanding of the influence of Milankovitch cyclicity on sedimentation.
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...
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.
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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1 Uličný, Daniel
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