Burial and thermal history modelling of the Upper Carboniferous strata based on vitrinite refl ectance data from Bzie-Dębina-60 borehole (Upper Silesian Coal Basin, southern Poland)

Integrated modeling of the coal rank in the Upper Carboniferous sediments of the BzieDębina-60 borehole from SW of the Upper Silesian Coal Basin was performed based on a new vitrinite reflectance measurements from the Westphalian A. Microscopic investigations of Westphalian samples in the Bzie-Debina-60 well have shown that organic matter is dominated by vitrinite maceral group. The coal rank in the well shows an increase with depth. The mean vitrinite reflectance values in these samples range from 0.76 to 1.07 %. One-dimensional forward modelling of thermal maturity in the Bzie-Dębina-60 borehole section has been performed in order to explain the burial and thermal history. The maximum temperature (c. 145 °C) causing the coalification occurred in the Latest Carboniferous (c. 300 Ma). These processes were likely related to signifi cant late Variscan burial heating in this area as indicated by previous authors

Sedimentation rates of recent fluvial sediments in oxbow lakes of the Morava river between Postřelmov and Olomouc

This study is focused on the recent fluvial sediments in oxbow lakes of the Morava river in central Moravia. A series of shallow drill cores shows a distinct vertical stratification of the sediments due to colour and grain size. The recent sediments rates were measured by using the dating by 137Cs. The northern part of the area shows sedimentation rates up to 2 cm per year while in the southern part, the sedimentation rates are between 2.5 a 5.5 cm per year. High rates could be up to 7.5 cm per year, which is comparable with other studies from the Morava river catchment.This study is focused on the recent fluvial sediments in oxbow lakes of the Morava river in central Moravia. A series of shallow drill cores shows a distinct vertical stratification of the sediments due to colour and grain size. The recent sediments rates were measured by using the dating by 137Cs. The northern part of the area shows sedimentation rates up to 2 cm per year while in the southern part, the sedimentation rates are between 2.5 a 5.5 cm per year. High rates could be up to 7.5 cm per year, which is comparable with other studies from the Morava river catchment

FACIÁLNÍ ANALÝZA HRANIČNÍHO INTERVALU MEZI MACOŠSKÝM A LÍŠEŇSKÝM SOUVRSTVÍM NA VYBRANÝCH PROFILECH V MORAVSKÉM KRASU

Devonian carbonates of the Moravian Karst area, Bohemian Massif, are preserved in two principal lithostratigraphic units, Macocha Formation (MF) and Líšeň Formation (LF), which are separated by abrupt facies boundaries. Outcrop-scale facies analysis and quantitative microfacies analysis of selected boundary sections between the MF and LF reveals the former to be represented by shallow-water carbonate platform facies (loferites and peri-reefal deposits), whereas the latter to consists of hemipelagic, upper-slope to base-of-slope facies (periplatform ooze, carbonate debris flows deposits and calciturbidites). The boundary between the two formations is believed by us to represent a carbonate platform-drowning surface. There are significant time-shifts in the platform drowning surfaces (onset of the LF sedimentation) within the interval from the Upper Frasnian (Pa. rhenana Zone) to lowermost Famennian (Pa. crepida Zone). Diachronous nature of the boundary points to alternative (most probably tectonic) controls on the drowning of the carbonate platform than to a simple ecological-stress induced drowning associated with the Frasnian/Famennian boundary

KONODONTOVÁ BIOSTRATIGRAFIE HÁDSKO-ŘÍČSKÝCH VÁPENCŮ U GRYGOVA

Three representative sections of Hády-Říčka Lmst., Líšeň Fm., located near Grygov, Central Moravia, were studied with respect to conodont biostratigraphy, conodont biofacies and carbonate microfacies. A major part of the carbonate unit was deposited within the Lower, Middle and Upper Pa. expansa Zone and presumably also in the lowest part of Si. praesulcata Zone, creating a prominent coarsening upward succession of deeper-water skeletal and intraclastic calcarenites and calcirudites (gravity-flow deposits). Carbonate deposition was interrupted in early Si. praesulcata Zone. Following a long-term hiatus, which developed presumably due to sea-level fall related to Gondwana glaciation, the overlying skeletal-peloidal calcarenites started to be deposited in latest Si. sandbergi Zone or earliest Lower Si. crenulata Zone. Carbonate sedimentation persisted in the area at least to the latest part of Si. isosticha - Upper Si. crenulata or the earliest part of Lower Gn. typicus Zone

Depositional architecture of modern fluvial deposits in Čerták (Staré Město u Uherského Hradiště) – artificial oxbow lake of the Morava river

Ground penetrating radar and drill holes were used for the study of depositional architecture of the locality Čerták (artificial oxbow lake of the Morava river) in the area of Staré Město u Uherského Hradiště. Sedimentary successions were divided into elements with different depositional history. High rate of deposition and strong role of climatic factors of deposition can be followed.Ground penetrating radar and drill holes were used for the study of depositional architecture of the locality Čerták (artificial oxbow lake of the Morava river) in the area of Staré Město u Uherského Hradiště. Sedimentary successions were divided into elements with different depositional history. High rate of deposition and strong role of climatic factors of deposition can be followed

Shallow geophysical mapping of buried karst surface near Hranice using electrical resistivity tomography

This paper presents the results of geophysical mapping of buried relief in the Hranice karst, central Moravia, by electrical resistivity tomography (ERT). Geophysical data were compared with borehole database and interpretations of Hranice karst morphology (published data). Three measurement areas were selected SE of the city of Hranice close to prominent limestone outcrops and expected buried karst phenomena. Fourteen 2D resistivity profiles were measured by ARES system using the Wenner-Schlumberger array. The ERT proved to be very useful due to contrasting resistivities between the limestone and the clayey cover sediments. Our data support the idea of pre-Miocene tropical karstifi cation published by previous authors.This paper presents the results of geophysical mapping of buried relief in the Hranice karst, central Moravia, by electrical resistivity tomography (ERT). Geophysical data were compared with borehole database and interpretations of Hranice karst morphology (published data). Three measurement areas were selected SE of the city of Hranice close to prominent limestone outcrops and expected buried karst phenomena. Fourteen 2D resistivity profiles were measured by ARES system using the Wenner-Schlumberger array. The ERT proved to be very useful due to contrasting resistivities between the limestone and the clayey cover sediments. Our data support the idea of pre-Miocene tropical karstifi cation published by previous authors

PŘEDBĚŽNÉ ZHODNOCENÍ RYCHLOSTI SEDIMENTACE VE VYBRANÝCH PŘEHRADNÍCH NÁDRŽÍCH V POVODÍ MORAVY

Artificial lakes and reservoirs serve as traps for suspended sediment. In this paper we study sediments in Brno dam and Nové Mlýny reservoirs. We determine the sedimentation rate and depth of dam sediments. 137Cs dating were used for determination of chronology. Magnetic susceptibility and X-ray densitometry were used to establish a stratigraphic framework in the cores. 137Cs dating revealed a distinct Chernobyl peak at 44–48 cm depth inferring an average sedimentation rate of 2.3 cm per year in the Nové Mlýny reservoir. In the Brno reservoir, the Chernobyl peak was located in 62–65 cm depth indicating an average sedimentation rate of 3.04 cm per year

Biostratigrafické doklady pro tence šupinovitou stavbu hranického paleozoika, moravskoslezská zóna

The first conodont-supported outcrop evidence of biostratigraphic inversion in the Hranice Palaeozoic, NE Moravo-Silesian Zone, is presented in this paper. About 2m thick lense of Middle Tournaisian skeletal calcarenite and calcirudite with phosphorite fragments (L. Si. crenulata to Si. isosticha – U. Si. crenulata) is enclosed in mylonitised Upper Famennian (?Pa. marginifera Zone to Pa. expansa Zone) calcilutites at the Černotín section. The lense is oriented parallel to deformation cleavage whose orientation is consistent with that of the shear zones described from other parts of the Hranice Palaeozoic by previous authors. The newly-described biostratigraphic inversion very well fits in the previously proposed models of thin-skinned structure of the Brunovistulicum and its sedimentary cover in the NE Moravo-Silesian Zone, derived from interpretation of borehole and seismic data

Field gamma-ray spectrometric characteristics of arenites of the Godula Formation and its genetic interpretation

Our study was focused on low to medium radioactive sandstones of the Godula Formation of the external fl ysch zone of the Western Carpathians. It is widely known that concentrations of radioactive elements (K, U and Th ) in siliciclastic sediments are primary controlled by facies and mineral and chemical composition, which is largely influenced by their provenance. In the Godula Formation, K was found to be predominantly incorporated in some framework and accessory detritic minerals (K-feldspars, albite, mica, glauconite, illite). Main sources of U and Th were identified in heavy minerals, such as monazite and zircon. Variations of K, U and Th concentrations correspond to changes in modal composition of sandstones and indicate uplift and subsequent erosion of structurally deeper crustal parts of source area (Silesian Ridge). Significant increase of K, U and Th concentrations was observed near the boundary between the Middle and Upper Godula beds. Gamma-ray spectrometry could be used as good supplementary technique for discrimination of sandstones of these lithostratigraphical parts of the Godula Formation.Our study was focused on low to medium radioactive sandstones of the Godula Formation of the external flysch zone of the Western Carpathians. It is widely known that concentrations of radioactive elements (K, U and Th ) in siliciclastic sediments are primary controlled by facies and mineral and chemical composition, which is largely influenced by their provenance. In the Godula Formation, K was found to be predominantly incorporated in some framework and accessory detritic minerals (K-feldspars, albite, mica, glauconite, illite). Main sources of U and Th were identified in heavy minerals, such as monazite and zircon. Variations of K, U and Th concentrations correspond to changes in modal composition of sandstones and indicate uplift and subsequent erosion of structurally deeper crustal parts of source area (Silesian Ridge). Significant increase of K, U and Th concentrations was observed near the boundary between the Middle and Upper Godula beds. Gamma-ray spectrometry could be used as good supplementary technique for discrimination of sandstones of these lithostratigraphical parts of the Godula Formation

Geophysical mapping of karst structures using multielectrode resistivity surveys; example from „Za hájovnou“ Cave, Javoříčko Karst

This paper investigates the scope and applicability of multielectrode resistivity surveying in the study of buried karst structures. Six resistivity sections, 62 to 117 m long, were measured above the well-documented cave system “Za hájovnou” in the Javoříčko Karst, Bohemian Massif. Three domains of distinct resistivity values (27.6 to ~210 Ω.m; ~210 to ~1 300 Ω.m; ~1 300 to 26 112 Ω.m) were interpreted as clays and silts, carbonate-rich karstified zones, and massive carbonate, respectively. Most of the geophysically documented karstification manifests itself in planar zones of karstified carbonate, partly filled with fine-grained siliciclastics, which coincide with several cave corridors in plan view. Orientation of the karstified zones corresponds to the NNE–SSW trending axial plane cleavage and ESE–WNW trending fractures and faults in the underlying rocks. The resistivity surveying proves to be an excellent method for mapping of shallow cave structures.This paper investigates the scope and applicability of multielectrode resistivity surveying in the study of buried karst structures. Six resistivity sections, 62 to 117 m long, were measured above the well-documented cave system “Za hájovnou” in the Javoříčko Karst, Bohemian Massif. Three domains of distinct resistivity values (27.6 to ~210 Ω.m; ~210 to ~1 300 Ω.m; ~1 300 to 26 112 Ω.m) were interpreted as clays and silts, carbonate-rich karstified zones, and massive carbonate, respectively. Most of the geophysically documented karstification manifests itself in planar zones of karstified carbonate, partly filled with fine-grained siliciclastics, which coincide with several cave corridors in plan view. Orientation of the karstified zones corresponds to the NNE–SSW trending axial plane cleavage and ESE–WNW trending fractures and faults in the underlying rocks. The resistivity surveying proves to be an excellent method for mapping of shallow cave structures