|
|
Miocene fish fauna from the Cheb and Sokolov Basins: taxonomic overview and palaeoecology
Hakalová, Pavla ; Přikryl, Tomáš (advisor) ; Mazuch, Martin (referee)
The aim of this thesis is to present an overview of Miocene fish fauna of the lacustrine sediments in the Cheb and Sokolov Basins, geological settings of this area, and fish associations in individual biozones. Sediments of Cheb and Sokolov Basins were deposited during time interval from Eocene until Miocene in the subtropical zone of the North hemisphere. Volcanic and post-volcanic activities of the Ohárecký rift influenced development of these basins. It's possible define two time sections within development of these basins: early and later; both of them provide rich record of fossil fishes. For the early period of the development is typical smaller range of the lake and its shallow depth. The relicts of this stage are limited to Cheb Basin mainly. Fish fossil record is limited, with three species only: Esox sp., Palaeotinca egeriana and Leuciscus (Palaeoleuciscus) socoloviensis. Low fish diversity could have been affected by poor living conditions or lower taxonomic diversity in general during this time. The later developmental period was much longer. The lake was much bigger - it spread to Sokolov Basin also. The fish fauna diversity is much higher, including taxons Paleotinca egariana, Leuciscus (Palaeoleuciscus) socoloviensis, Aphanius chebianus, Paralebias egeranus and Gobius sp. It is...
|
|
|
History of vegetational development in the Cheb basin from sedimentary record of the SOOS National Nature Reserve
Suda, Tomáš ; Kuneš, Petr (advisor) ; Bešta, Tomáš (referee)
Vegetation development in the Cheb basin ( W Czech Republic) recorded in the sediments of the SOOS ational ature Reserve This thesis focuses on palaeoecological research of quaternary sediments in the Soos National Nature Reserve (Cheb basin, NW Czech Republic). Quaternary history of this locality is poorly known, despite it is a valuable and protected area with high natural qualities. The Soos basin is also known for its unique geological record, which is expected to cover information on landscape dynamics at least during the Holocene. A lake existed in the Soos basin enabling accumulation of diatomite and peat sediments of a broad palaeoecological potential. Records were analysed with method of pollen analysis and were dated using 14C. The results of this study bring information about vegetation development in the area of Cheb basin as well as development of lake ecosystem. It also gives a new insight on lake's origin and its age. The accumulation of peat sediments started in the Preboreal period and was continuous at least until the Atlantic following with a hiatus, therefore further detection of vegetation development is impossible. The beginning of diatomite accumulation, as well as the existence of the lake goes back to the Bølling interstadial, according to radiocarbon dating. However, this...
|
|
|
Relations of the carbon dioxide occurrence and geologic conditions of the Cheb basin
Pavlát, Jan ; Datel, Josef (advisor) ; Hrkal, Zbyněk (referee)
This bachelor thesis describes the area of the Cheb basin which is situated in the Western Bohemia, and shows the geological, tectonic, hydrogeological structure of this area. The main feature of the bachelor thesis is a CO2 emission in the Cheb basin, near the village Dolní Částkov but it also describes the occurrence of mineral waters in the vicinity of the chosen lokality. Furthermore, the bachelor thesis deals with the emanation of gases in groundwaters. The bachelor thesis describes the properties and occurrence of CO2. At the end of the bachelor thesis, there are results of my measurements in a regular network of points with a device Meopta DI-2 654-03, which serves for an air sampling and measures the concentration of CO2 expressed in percentages. Key words: carbon dioxide, the Cheb basin, geological conditions, mineral water
|
|
|
Effect of CO2 production on the water level in a closed borehole
Turjaková, Veronika ; Vlček, Josef (advisor) ; Lanzendörfer, Martin (referee)
This thesis is focused on upper mantle originated carbon dioxide exhalations in the area of Western Bohemia, particularly Cheb basin. It describes local geology, current geodynamics, earthquake swarms and related issues. The thesis introduces a simple physical model of gas- water mixture behaviour in a closed borehole. The model was created using elementary physical principles and works as a tool for simplifying the description of events, which were registered at a monitoring borehole HJB-1 at Hartoušov site. Last part of the thesis includes data which were recorded for the verification of the model. These are presented and interpreted at the end of the thesis. Key words: carbon dioxide, Henry's law, Cheb basin
|
|
|
Late Quaternary activity of slow-slip intraplate Mariánské Lázně fault as revealed by trenching and shallow geophysical survey; Bohemian Massif (Czech Republic, central Europe)
Štěpančíková, Petra ; Fischer, T. ; Hartvich, Filip ; Tábořík, Petr ; Rockwell, T. ; Stemberk, Jakub ; Široký, J. ; Sana, Hamid
The NNW-SSE trending Mariánské Lázně Fault (MLF) zone is situated in the western part of the Bohemian Massif (Czech\nRepublic, central Europe) where it intersects NE-trending Cenozoic Eger rift. The northern segment of the MLF controls the\nmorphologically pronounced mountain front of Krušné hory Mts. and eastern limit of Cenozoic Cheb basin, which is famous for\nearthquake swarms (max. ML=4.6) and CO2 emanation. We performed 2D and 3D geophysical survey (electric resistivity\ntomography, ground penetration radar) and 3D trenching to look for large surface-rupturing prehistoric earthquake responsible\nfor pronounced moutain range front. Seven excavated and six hand-dug trenches revealed a complex geology and deformation\nat the study site probably as a result of right-lateral transpression during Late Quaternary. Two Holocene earthquakes 1150-590\nBC and 780-1000 AD were inferred from 14C dating of faulted Holocene colluvium with corresponding magnitudes Mw=6.7-7.0.\nThe latter one is the youngest documented surface-rupturing event in central Europe.\n
|
|
| |
|
|
Miocene fish fauna from the Cheb and Sokolov Basins: taxonomic overview and palaeoecology
Hakalová, Pavla ; Přikryl, Tomáš (advisor) ; Mazuch, Martin (referee)
The aim of this thesis is to present an overview of Miocene fish fauna of the lacustrine sediments in the Cheb and Sokolov Basins, geological settings of this area, and fish associations in individual biozones. Sediments of Cheb and Sokolov Basins were deposited during time interval from Eocene until Miocene in the subtropical zone of the North hemisphere. Volcanic and post-volcanic activities of the Ohárecký rift influenced development of these basins. It's possible define two time sections within development of these basins: early and later; both of them provide rich record of fossil fishes. For the early period of the development is typical smaller range of the lake and its shallow depth. The relicts of this stage are limited to Cheb Basin mainly. Fish fossil record is limited, with three species only: Esox sp., Palaeotinca egeriana and Leuciscus (Palaeoleuciscus) socoloviensis. Low fish diversity could have been affected by poor living conditions or lower taxonomic diversity in general during this time. The later developmental period was much longer. The lake was much bigger - it spread to Sokolov Basin also. The fish fauna diversity is much higher, including taxons Paleotinca egariana, Leuciscus (Palaeoleuciscus) socoloviensis, Aphanius chebianus, Paralebias egeranus and Gobius sp. It is...
|
|
|
History of vegetational development in the Cheb basin from sedimentary record of the SOOS National Nature Reserve
Suda, Tomáš ; Kuneš, Petr (advisor) ; Bešta, Tomáš (referee)
Vegetation development in the Cheb basin ( W Czech Republic) recorded in the sediments of the SOOS ational ature Reserve This thesis focuses on palaeoecological research of quaternary sediments in the Soos National Nature Reserve (Cheb basin, NW Czech Republic). Quaternary history of this locality is poorly known, despite it is a valuable and protected area with high natural qualities. The Soos basin is also known for its unique geological record, which is expected to cover information on landscape dynamics at least during the Holocene. A lake existed in the Soos basin enabling accumulation of diatomite and peat sediments of a broad palaeoecological potential. Records were analysed with method of pollen analysis and were dated using 14C. The results of this study bring information about vegetation development in the area of Cheb basin as well as development of lake ecosystem. It also gives a new insight on lake's origin and its age. The accumulation of peat sediments started in the Preboreal period and was continuous at least until the Atlantic following with a hiatus, therefore further detection of vegetation development is impossible. The beginning of diatomite accumulation, as well as the existence of the lake goes back to the Bølling interstadial, according to radiocarbon dating. However, this...
|
|
|
Grounwater regime of the Cheb Basin
Walter, Dominik ; Datel, Josef (advisor) ; Hrkal, Zbyněk (referee)
This study summarizes some general findings of geological, hydrogeological, hydrological, structural and other conditions of the Cheb tertiary basin and descrides how these conditions are connected with circulation of graoundwaters and with appearance of mineral waters of different chemical composition and appearance of discharge of dry CO2. The final chapter shows information of changes of groundwater level at specific locations and periods of time by analyzing data gathered from borehole monitoring site of Czech Hydrometeorological Institute. Measuring of groundwater level was taken every day or every week, also average data of every month were taken. These data show variant changes of groundwater level which can be associated with definite events and this study shows if it is possible to associate some changes of groundwater level with exact events.
|
|
|
Chemical composition of moldavites from the Cheb Basin and their relationship to other tektites of the Central European strewn field
Skála, Roman
Basic physical properties (weight, shape, color and sculpture) were evaluated for over 350 individual finds of tektites from 4 different localities in the Cheb Basin. They are similar to those observed for South Bohemian moldavites. Totally, 24 tektites from the Cheb Basin and 17 from the South-Bohemian and Moravian substrewnfields have been characterized chemically using EPMA. Contents of major elements overlap between the two sample sets covering a broad range; trends observed in the Harker plots, however, seem to differentiate several partial groups. Minor and trace elements have been measured with an LA-ICP-MS technique. Preliminary 40Ar/39Ar dating shows that Cheb tektites are coeval with moldavites from South Bohemia and Western Moravia. Finding of a new moldavite substrewnfield around Cheb substantiate the theory that moldavites were ejected from the Ries impact structure in a fan-shaped jet.
|
guest ::
