Home > Search Results: Velebil, Dalibor
Search:
Search Tips :: Advanced Search
Search collections:
Sort by: Display results: Output format:
National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Secondary gold mineralization at Bezdružice area
 Mladý, Tomáš ; Zachariáš, Jiří (advisor) ; Velebil, Dalibor (referee)
This thesis is focused on orogenic gold deposits and placer gold deposits. The first part describes predispositions for formation of orogenic gold deposits and their place in time and space. Next part of this thesis discusses mechanisms of formation of secondary gold deposits, so called placers. Practical part of this thesis is studying the sites in the neighbourhood of Bezdružice in West Bohemia - paleoplacer in sand quarry near municipality Křivce, grove with old mine works near municipality Nová Ves and the creeks which surround the grove from north and south. The aim of this thesis is to define whether the gold nearby Nová Ves originates in the Carboniferous paleoplacers which are in the proximity of old mines or if it comes from primary deposit and was formed close to cinnabar mineralization. Specimens were analysed under optical microscope and by energy dispersive system coupled with SEM. These analyses helped to distinguish gold flakes from the creeks of Nová Ves and the gold flakes from paleoplacer.
Detailed record
Historical cinnabar deposits in Bohemia - genetic study.
 Velebil, Dalibor ; Ackerman, Lukáš (referee) ; Zachariáš, Jiří (advisor)
The study of fluid inclusions proved the metamorphic origin of the cinnabar-pyrite mineralization at the deposit of Horní Luby. In addition, thermal conditions of the mineralization formation were determined. During the deposit forming processes, the primary homogenous H2O-CO2 fluid of the temperature of about 300řC was differentiated to fractions rich in H2O or CO2. The differentiation took place in several stages in the temperature range between 200 to 150řC. Quartz crystallized from the parent fluid at the temperature about 300řC, pyrite at temperatures in the range of 220řC to 210řC and cinnabar at temperatures in the range of 195řC to 160řC. The cinnabar is thus the youngest mineral at the deposit (crystallization succession. quartz - pyrite - cinnabar). At the deposit of Jedová hora, quartz crystallized at the temperature of about 160řC to 150řC, barite at temperature of about 115řC (the fluid boiling point) and cinnabar in the range between these temperatures. The origin of mercury at all Czech historical deposit of cinnabar can be very likely related to Lower Paleozoic submarine volcanism. In all cases, the pre-concentrated mercury was remobilized during the Variscian metamorphosis, followed by precipitation in form of veins with cinnabar or as cinnabar impregnation. Study of tetrahedrite...
Detailed record

Interested in being notified about new results for this query?
Subscribe to the RSS feed.
Digital Repository :: Search :: Submit :: Personalize :: Help
Powered by Invenio v1.1.2
Maintained by admin.invenio@techlib.cz
This site is also available in the following languages:
Česky  English