Slovo geologa.
Žák, Karel
2020 - Czech
Available at various institutes of the ASCR
Slovo geologa.
Shaanxi 2019 - do nitra masivu
Motyčka, Z.; Filippi, Michal
2020 - Czech
Keywords:
caves; exploration; Xioananhai; Hanzhong; China
Available at various institutes of the ASCR
Shaanxi 2019 - do nitra masivu
Shaanxi 2018 - první velké objevy
Motyčka, Z.; Filippi, Michal
2019 - Czech
Keywords:
Shaanxi 2018 expedition; speleology; caves
Available at various institutes of the ASCR
Shaanxi 2018 - první velké objevy
Granitová jeskyně Gobholo ve Svazijsku
Filippi, Michal; Bruthans, J.
2019 - Czech
Keywords:
caves; granite rock; Gobholo granite cave, Swaziland; speleothems
Available at various institutes of the ASCR
Granitová jeskyně Gobholo ve Svazijsku
New data on the origin of the Fe-Cu-As skarn deposit at Obří důl, West Sudetes, Bohemian Massif
Pašava, J.; Veselovský, F.; Dobeš, P.; Erban, V.; Pour, O.; Žák, Karel; Ackerman, Lukáš; Haluzová, Eva; Creaser, R.; Tásler, R.
2017 - English
The Obří důl Fe-Cu-As sulfide deposit is hosted in metamorphosed lenses of marble, calc-silicate rocks and skarns. The deposit is located up to a few hundred meters away from the contact of the large, late-orogenic Variscan Krkonoše-Jizera Plutonic Complex (KJPC). Mineralogical and fluid inclusion studies of the Gustavská ore lens show that the main sulfide stage, dominated by pyrrhotite, chalcopyrite and arsenopyrite, originated from water-rich hydrothermal fluids with salinities up to 8 wt.% NaCl eq. at temperatures ranging from 324 to 358°C.These fluids replaced mainly the carbonate-rich lithologies. The 34S values indicate a magmatic source of sulfur and Re/Os dating of molybdenite are consistent with simultaneous formation of the main sulfide stage ore and the KJPC.
Keywords:
Obří důl; Bohemian Massif; West Sudetes
Available at various institutes of the ASCR
New data on the origin of the Fe-Cu-As skarn deposit at Obří důl, West Sudetes, Bohemian Massif
The Obří důl Fe-Cu-As sulfide deposit is hosted in metamorphosed lenses of marble, calc-silicate rocks and skarns. The deposit is located up to a few hundred meters away from the contact of the ...
Klima, utečenci a proměna společnosti
Cílek, Václav
2015 - Czech
Keywords:
climate change; resources; migration
Available at various institutes of the ASCR
Klima, utečenci a proměna společnosti
Krajina, archeologie, čas a příroda v Hájkově kronice
Cílek, Václav
2015 - Czech
Keywords:
Hájek‘s Chronicle; landscape; literature; archaeology; Middle Ages
Available at various institutes of the ASCR
Krajina, archeologie, čas a příroda v Hájkově kronice
Geologie Prahy
Mikuláš, Radek
2014 - Czech
Keywords:
geology; nature conservation; landscape; urban ecology; Prague
Available at various institutes of the ASCR
Geologie Prahy
Na Javorce Cave - a new discovery in the Bohemian Karst (Czech Republic): unique example of relationships between hydrothermal and common karstification.
Dragoun, J.; Žák, Karel; Vejlupek, J.; Filippi, Michal; Novotný, J.; Dobeš, J.
2013 - English
The Na Javorce Cave is located in the Bohemian Karst, Czech Republic, about 25 km SW of Prague. The cave was formed in vertically dipping layers of Lower Devonian limestone; it is 1,723 m long and 129 m deep, of which 9 m is permanently flooded. The cave is polygenetic, with several clearly separable evolutionary stages. Cavities discovered to date were mostly formed along the tectonic structures of two main systems. One of these systems is represented by vertical faults of generally N-S strike, which are frequently accompanied by vein hydrothermal calcite with crystal cavities. The second fault system is represented by moderately inclined west-dipping faults. Smaller tube-like passages of phreatic morphology connect the larger cavities. The fluid inclusion data obtained for calcite developed along both fault systems in combination with C and O stable isotope studies indicate that the hydrothermal calcite was deposited from moderately NaCl-type basinal fluids (0.5 to 8.7 wt. % NaCl equ
Keywords:
caves; karstification; karst; Bohemian Karst
Available at various institutes of the ASCR
Na Javorce Cave - a new discovery in the Bohemian Karst (Czech Republic): unique example of relationships between hydrothermal and common karstification.
The Na Javorce Cave is located in the Bohemian Karst, Czech Republic, about 25 km SW of Prague. The cave was formed in vertically dipping layers of Lower Devonian limestone; it is 1,723 m long and 129 ...
New localities of coarsely crystalline cryogenic cave carbonates in Slovakia
Orvošová, M.; Vlček, L.; Žák, Karel
2013 - English
Three new localities of coarsely crystalline cryogenic cave carbonates (CCCcoarse) have been recently discovered in the Western Carpathians, Slovakia. CCCcoarse are secondary mineral formations in the cave and belong to speleothems. They occur in the form of loose accumulations of calcite crystals and crystal aggregates freely deposited on the bottom of the cavities. Their genesis is interpreted as related to slow karst-water freezing in pools inside the caves, in relation to the existence of a permafrost zone during Quaternary glacials. The newly discovered CCCcoarse localities in Četníkova svadba Cave, Demänovská j. mieru Cave and Zlomísk Cave are characterized by description and photodocumentation of the present crystal forms, by preliminary C and O isotope data, and by their U-series ages. The ages of the cryogenic crystals are in the range between 47 and 12 ka BP, corresponding to the latter half of the Last Glacial. Any new locality of CCCcoarse formed during the Last Glacial represents an important source of information about paleoclimatic conditions of adjacent areas. The U-series ages of the new localities support the earlier conclusion that the formation of CCCcoarse is related to transitions from cold to warm climate periods within the Last Glacial.
Keywords:
caves; carbonates; cryogenic carbonates
Available at various institutes of the ASCR
New localities of coarsely crystalline cryogenic cave carbonates in Slovakia
Three new localities of coarsely crystalline cryogenic cave carbonates (CCCcoarse) have been recently discovered in the Western Carpathians, Slovakia. CCCcoarse are secondary mineral formations in ...
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