A5055168352- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Geological Formations and Processes Exploration
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Mineralogy and Gemology Studies
- Paleontology and Stratigraphy of Fossils
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Groundwater and Isotope Geochemistry
- Radioactive element chemistry and processing
- Building materials and conservation
- Metal Extraction and Bioleaching
- Scientific Research and Discoveries
- High-pressure geophysics and materials
- Geochemistry and Elemental Analysis
- Glass properties and applications
- Image Processing and 3D Reconstruction
- Coal Properties and Utilization
- Geological Modeling and Analysis
- Geoscience and Mining Technology
- Coal and Its By-products
- Mercury impact and mitigation studies
- Electron Spin Resonance Studies
- Geological Studies and Exploration
Charles University
2014-2024
Institute of Geochemistry
2004
Abstract The major- and trace-element chemistry of pyrite arsenopyrite from the mesothermal Roudný gold deposits was studied by electron microprobe laser ablation ICP-MS techniques. In total, four generations two were distinguished. is enriched in As through an Fe (As x S 1–x ) 2 substitution mechanism. As-rich zones pyrite-2 (up to 4.5 wt.% As) are also 20 ppm), lead (commonly up 220 ppm, exceptionally 1500 ppm) antimony <600 rarely 1350 ppm). Positive correlation Au pyrites not coupled...
Orogenic gold deposits with of low-fineness are relatively rare in the Bohemian Massif but occur locally within late Variscan Blanice graben structure Moldanubian zone. Among them, Roudný deposit has been most important, total production about 6 t between 1895 and 1930. The ore is related to an irregular quartz stockwork represented by sulfide electrum impregnations gangue altered host rocks. Ore grade varies from 4 25 g/t Au. present as macro-and microscopic (fineness 658–665) also...
The trace-element contents in gold-bearing and barren quartz veins from eight Au, Au-Ag Sb-Au Variscan deposits the Bohemian Massif have been determined situ order to evaluate differences between various types of gold discuss variations successive generations veins.The variability Ti, Al, Ge, Li Sb abundances obtained by Laser-Ablation Inductively-Coupled Plasma Mass Spectrometry (LA-ICP-MS) roughly correlates with origin temperature mineralizing fluids.The Al content ranges up 4020 ppm...
Abstract Rare phases of the Au–Ag–Sb system were recognized in Krásná Hora Sb-Au deposit (Sb 1.5–3 wt.%; Au 3–5 ppm), Czech Republic which correspond to auriferous dyscrasite (up 7 at.% Au), allargentum 34 and an unnamed phase with composition similar eutectics (E1, E2) experimental system. The dominant ore mineral is stibnite rare native antimony, gold a Ag-Au alloy. Textural relationships are well established: (early) →gold → aurostibite antimony (late). Gold present four generations: Au-1...
This mineralogical and fluid inclusion study was conducted on an Au-bearing quartz–sulfide vein encountered in the deep parts of Bytíz deposit Příbram uranium base-metal district, Bohemian Massif, Czech Republic. The samples were taken where is crosscut by common Zn-Pb ore Bt23C. early mineralization composed mainly quartz (Q-1 to Q-3), illite–muscovite, Fe-Mg chlorite, arsenopyrite, Au-Ag alloys, showing a wide range compositions (4–69 at. % Ag) decrease Au/(Au + ratios during evolution....
The Roudný gold deposit, hosted by a large-scale NNE-SSW trending fault zone (the Blanice Graben), represents type locality of low-fineness (Au-Ag) mineralization in the Bohemian Massif.In order to decipher its structural evolution, we performed detailed analysis brittle brittle-ductile structures on outcrops and described unpublished historical materials.Three stress phases were distinguished: compressional, strike-slip, extensional.Most hydrothermal veins originated during strike-slip...
The stratiform deposit of mercury at Horní Luby near Cheb (Czech Republic) is hosted by Ordovician phyllites Vogtland-Saxony Paleozoic Unit in the Saxothuringian Zone Bohemian Massif.Ore represented cinnabar disseminated within phyllite and lenticular bodies rich massive (lenses with a thickness up to 1 m length along strike varying from less than 20 m).Cinnabar accompanied pyrite locally also siderite.The P-T history mineralization was deciphered study fluid inclusions.Early fluids are...
A mineralogical and geochemical study has been carried out of the historical Pb-Zn-Cu Broumov Tøi Sekery mining district in northern part Èeský les valley, vicinity boundary between Moldanubian Saxothuringian units.Sulphide mineralization NW-SE NE-SW trending quartz veins was formed three stages: 1) early alteration related stage: chlorite, tourmaline quartz; 2) main quartz, galena, sphalerite, chalcopyrite pyrite; 3) late fracture stage : minor pyrite, gersdorffite unidentified Bi-Co-Ni-As...
Trace-element variations in uraninite were employed to decipher its chemical age and evaluate the As-rich nature of fluids during formation at Jenikov, Teplice area, central part Cenozoic Ohře Graben, Bohemian Massif, Czech Republic. Cretaceous sandstones graben fill show two distinctive stages young mineralization (less than 18 Ma), most probably related topography-driven flow epithermal fluid along northwestern boundary-fault (the Krusne hory Fault). The older stage is dominated by...