|
| |
|
|
Alluvial gold placers from Klínec area - morphology and nature of gold
Fox, Simon ; Zachariáš, Jiří (advisor) ; Štědrá, Veronika (referee)
The search for economically viable gold deposits remains a significant pursuit requiring skilled expertise. The first part of the thesis establishes essential concepts related to gold ore deposits and placer gold, including its elemental properties, genesis in an orogenic environment, transportation by natural forces, and deposition in a fluvial setting. The study particularly focuses on the Klínec area in Central Bohemia and offers an insight into the geological region characterized by a Neoproterozoic basement uplifted during the late Miocene due to tectonic movements that played an integral role in the placer gold deposition. The historical context of gold mining in this Bohemian region is also presented. The practical segment of this thesis aims to establish connections between statistical and observational methods and the relationship between placer gold and its orogenic gold deposit. The methodology involves fieldwork for collecting gold particles which were then subjected to optical observation and microscopic photography. Morphological features, particularly sphericity and roundness, are analysed to identify trends indicating proximity to the primary gold source. The findings reveal that gold particles closer to the primary source exhibit sharper angularity, larger grain size, and greater...
|
|
|
Uranium mineralization in the Krkonoše permian piedmont basin: Radioactive elements in the Rudník horizon near Vrchlabí
Novák, Dominik ; Goliáš, Viktor (advisor) ; Tuhý, Marek (referee)
This paper focuses on artificial outcrop of permian lacustrine sediments of the Rudník horizon (298-297 Ma) and red siltstones of the Vrchlabí formation near Vrchlabí, where increased concentrations of uranium and thorium radionuclides were observed during previous researches. Radionuclides are concentrated in a few layers of black, grey and red shales, which makes about 20 m of the whole 250 m long studied profile. Rock samples were collected from localised radioactive layers and studied for mineralogical compositions, concentrations of radionuclides and autoradiographic and microscopic study of uranium and thorium bonds in these rocks. Laboratory measurements confirmed increased concentrations of both uranium and thorium in collected samples. Highest amount of uranium was measured in anoxic black shale (106,9 ppm U), highest amount of thorium in anomalous sample of red siltstone (76,6 ppm Th). Shales and siltstones main contents are albite, analcime, calcite, dolomite, muscovite and potasium feldspars. Acording to the study it is assumed, that the main source of radionuclides were redeposited pyroclastics from the Krkonoše piedmont basin area or synchronous volcanic activity. It is likely, that during late tectonic development of the basin, these radionuclides were redistributed by hydrothermal...
|
|
|
Mineralogy in the School curricula
Kálalová, Anna ; Matějka, Dobroslav (advisor) ; Ziegler, Václav (referee)
This bachelor thesis is focused on teaching geology and mainly mineralogy on grammar schools. Questionnaire was made for purposes of this bachelor thesis. Objective of this questionnaire was to ascertain information about organization teaching geology and mineralogy on these types of schools and their inclusion in the school curricula. The questionnaire results showed that each school is very different in organization of teaching geology. Mineralogy is most often taught in first classes of four-year, or an equivalent multi-year study. Mineralogy is at some schools taught only in classes corresponding to an elementary school. Optional subject in which is the geology taught students may choose only to nearly forty percent of surveyed schools. Schools use a lot of sorts of material - textbooks for elementary and secondary schools, university textbooks, professional books and Internet resources. The most common tools used in the teaching of geology are collections of samples. Very frequent are also models of crystals and the geological maps. Fewer common are paintings, photographs and films with a geological theme. Uncommon are tools for microscopy and geological compass. 48 % of grammar schools incorporate to education laboratory work and geological or mineralogical excursion, 4 % only laboratory...
|
|
|
Sulphidic mineralization in the vicinity of the Bílina fault
Markes, Jan ; Zachariáš, Jiří (advisor) ; Goliáš, Viktor (referee)
The neoidic sulphide mineralization located in tertiary sediments of Lom Bílina in Bílina's fault is of hydrothermal origin. The sulphidic mineralization is associated with fault systems of Eger rift and temperature of fluid crystallization was about 50řC. The mineralization of Bílina's fault is rather monotonous, the marcasite and pyrite is mostly found without a trace elements. In the crystals were also registered zones with the contents of trace elements, especially As and Ni. The contents of As enriched precipitation zones were fluctuating from 0,2 to 5,4 wt. %, Ni enriched zones were ranged from 1,6 to 5,9 wt. %. The precipitation zones with increased As and Ni content were very thin, there were very short time intervals of As and Ni enriched fluids precipitation. In the marcasite crystals were also found the porous zones of clay mineral microinclusions. These zones showed higher content of Al and Si. There is high abundance of Fe-disulfides at Bílina's fault-dispersed in coal bed, or bonded to tectonic zone of the Bílina's fault. Pyrite and marcasite are dispersed in the coal bed and genetially aren't related to sulphides bonded to Bílina's fault.
|
|
|
Relic cross of Charles IV.
Melkus, René ; Sojka, Jaroslav (advisor) ; Šmied, Miroslav (referee)
The aim of this bachelor thesis is to present a historical, art-historical, and technological review of the most precious piece of the St. Vitus cathedral treasure - the great Provincial Cross, also known as the Karlstein Cross, or simply the Relic Cross. This prominent creation of High Gothic goldsmithing is linked with the Emperor and King Charles IV (1316-1378) and the year 1357, when the construction of Karlstein castle was finished. This monographic thesis deals solely with the Cross and strives to summarize all existing historical knowledge, while processing literature and sources in the usual heuristic manner. Above all, the thesis includes a thorough description of this craftsmanship artifact, followed by an art-historical interpretation. It aims to differ from other theses in its passion regarding the goldsmithing techniques and its effort to comprehend the medieval means of processing precious metals and gems. The author has chosen this subject in order to familiarize himself with common technological terminology and to use it properly. Therefore, the thesis becomes a theoretical preparation for the author's self-dependent work as a curator in the National Technical Museum in Prague.
|
|
|
Picritic rocks of the České Střredohoří Mts.
Šnellerová, Zuzana ; Jelínek, Emil (advisor) ; Ulrych, Jaromír (referee)
The first part of the thesis represents a summary of background knowledge about the geology of the České středohoří Mnt. In the second part, picritic rocks were investigated in detail. General aspects of the chemical and mineralogical compositions of this rock type and classification of picrites are discussed. In addition, macro and microscopic characteristics of rocks are included. The results of macroscopic and microscopic investigations indicate that the studied subvulcanic rocks from the České středohoří Mnt. can be characterised as picritic. However, chemical analyses of the rocks did not confirm this conclusion. Only the samples S-39 and S-40 can be disignated as picrites. Although the other samples show similar mineralogical composition, they need to be classified as basic subvulcanites of picritic type due to higher alkali content.
|
|
|
Conditions of formation of selected hydrothermal vein deposits in central part of the Bohemian Massif
Ulmanová, Jana ; Zachariáš, Jiří (advisor) ; Slobodník, Marek (referee)
This thesis deals with fluid inclusion study of quartz samples from Ratibořské Hory and Stará Vožice and baryte samples from Stříbrná Skalice and Černé Voděrady. Samples were studied by methods of microthermometry of fluid inclusions, Raman spectrometry, UV-fluorescence spectrometry and EDX analysis. In quartz sample from Stará Vožice there were detected low-salinity H2O-CO2-N2 fluids that were trapped at min. 240 MPa and 260 řC. This mineralization is probably connected with initial stages of structural evolution of the Blanice Graben. Late-metamorphic fluids were probable source of these solutions. In sample of quartz containing grains of galena there were trapped mesothermal (Th = 110-195 řC) low- to medium-salinity H2O-NaCl fluids, hydrocarbon fluids and low- salinity (H2O)-CO2-N2-CH4 fluids (containing max. 13 mol. % N2+CH4 in carbonic phase) trapped at low pressure (max. 10 MPa) and relatively low temperature (105-120 řC). In Ratibořské Hory there were detected heterogeneously trapped low- to medium-salinity H2O±CO2±N2±CH4- NaCl±KCl±MgCl2±FeCl2 (with max. 26 mol. % N2+CH4 in carbonic phase) fluids trapped at 1-25 MPa and 160-315 řC. In barite sample from Černé Voděrady were detected low- to high-salinity aqueous fluids with Na and Ca ± K, Fe, Mg chlorides. These solutions are probably derived...
|
|
| |
|
|
Relic cross of Charles IV.
Melkus, René ; Sojka, Jaroslav (advisor) ; Šmied, Miroslav (referee)
The aim of this bachelor thesis is to present a historical, art-historical, and technological review of the most precious piece of the St. Vitus cathedral treasure - the great Provincial Cross, also known as the Karlstein Cross, or simply the Relic Cross. This prominent creation of High Gothic goldsmithing is linked with the Emperor and King Charles IV (1316-1378) and the year 1357, when the construction of Karlstein castle was finished. This monographic thesis deals solely with the Cross and strives to summarize all existing historical knowledge, while processing literature and sources in the usual heuristic manner. Above all, the thesis includes a thorough description of this craftsmanship artifact, followed by an art-historical interpretation. It aims to differ from other theses in its passion regarding the goldsmithing techniques and its effort to comprehend the medieval means of processing precious metals and gems. The author has chosen this subject in order to familiarize himself with common technological terminology and to use it properly. Therefore, the thesis becomes a theoretical preparation for the author's self-dependent work as a curator in the National Technical Museum in Prague.
|
guest ::
