Stop Fri/3:Dětaň
Mikuláš, Radek; Fejfar, O.; Žigová, Anna; Kadlecová, Eva; Ulrych, Jaromír
2002 - English The locality Dětaň provides, in contrast to other occurences along the southern margin of Doupov Mts. a diverse geologic mainly in subaerial context. Keywords: volcanoclastic rocks; palaeontology; geochemistry Available at various institutes of the ASCR Stop Fri/3:Dětaň

The locality Dětaň provides, in contrast to other occurences along the southern margin of Doupov Mts. a diverse geologic mainly in subaerial context.

Mikuláš, Radek; Fejfar, O.; Žigová, Anna; Kadlecová, Eva; Ulrych, Jaromír
Geologický ústav, 2002

A review of selected sandstone weathering forms in the Bohemian Switzerland National Park, Czech Republic
Vařilová, Zuzana
2002 - English Keywords: sandstones; nature protection; Bohemian Switzerland National Park; ochrana; zvětrávání Available at various institutes of the ASCR A review of selected sandstone weathering forms in the Bohemian Switzerland National Park, Czech Republic

Vařilová, Zuzana
Geologický ústav, 2002

Lower Cretaceous in the Munella Mountains (Mirdita Zone, northeastern Albania)
Peza, Luftulla Hasan; Marku, D.
2002 - English The Munella Mountain is located in the Mirdita area, in the northeastern part of Albania. Berrisian, Valanginian deep-water flysch deposits. Unsorted breccias, including large blocks of ophiolites and Triassic limestones lie at the base of the Berriasian. Marls, sandstones, conglomerates with rare limestone intercalations characterize the upper part of the Berriasian. Sandstones and marls with abundant molluscs form the base of the Barremian-Aptian deposits. The highhest part of the section consists of platform limestones in Urgonian facies. An interruption in sedimentation during the Hauterivian was caused by the Mirditean orogeny. Keywords: berriasian; Valanginian; Barremian-Aptian; vápence; depozita Available at various institutes of the ASCR Lower Cretaceous in the Munella Mountains (Mirdita Zone, northeastern Albania)

The Munella Mountain is located in the Mirdita area, in the northeastern part of Albania. Berrisian, Valanginian deep-water flysch deposits. Unsorted breccias, including large blocks of ophiolites and ...

Peza, Luftulla Hasan; Marku, D.
Geologický ústav, 2002

Hloubětín - "Bažantnice" quarry
Bubík, M.; Kvaček, J.; Sviták, C.; Svobodová, Marcela
2001 - English The Cretaceous sections in the Hloubětín locality demonstrats stepwise transgressive succession of facies from fluvial to estuarive and marine. The age of deposits is most probably middle Cenomanian. Keywords: Palynomorphs; foraminiters; cenomanian Available at various institutes of the ASCR Hloubětín - "Bažantnice" quarry

The Cretaceous sections in the Hloubětín locality demonstrats stepwise transgressive succession of facies from fluvial to estuarive and marine. The age of deposits is most probably middle Cenomanian.

Bubík, M.; Kvaček, J.; Sviták, C.; Svobodová, Marcela
Geologický ústav, 2001

An Environmental Impact of Pyritic Bauxite from the Dajti Mine, Albania
Novák, Jiří Karel; Minařík, Luděk; Peza, Luftulla Hasan; Melka, Karel
2000 - English The accelerated chemical weathering of bauxite due to acid atmospheric deposition and breakdown of pyrite was simulated using short-termed laboratory acid leaching at 20 o C. Pyrite-bearing gibbsite-boehmitic bauxite giving rise to a number of questions concerning ecology was tested along with oxic boehmitic bauxite from the Dajti mine and that from Mali Korites (Mali Thate Mts., SE Albania). The leachte of pyrite-bearing and sulphate-producing bauxite is enriched in the following risk elements: Cd, Be, Zn, Ni, Co, and much less Cr, Cu, As, and Pb. Toxic soluble hydroxy-alumina ions may be also released into the aquatic environment, because of high concentration in output leachate (563 mg/l). In contrast, the leachates of oxic boehmitic bauxites commonly contain much lower concentrations of toxic elements with exception of Cu (Dajti mine) and Be (new occurence of Mali Korites). Keywords: acid leaching; acidification; karst bauxite Available at various institutes of the ASCR An Environmental Impact of Pyritic Bauxite from the Dajti Mine, Albania

The accelerated chemical weathering of bauxite due to acid atmospheric deposition and breakdown of pyrite was simulated using short-termed laboratory acid leaching at 20 o C. Pyrite-bearing ...

Novák, Jiří Karel; Minařík, Luděk; Peza, Luftulla Hasan; Melka, Karel
Geologický ústav, 2000

Recent allophane coatings from the karst and pseudokarst caves
Melka, Karel; Cílek, Václav
2000 - English Allophane is not often present in karst caves. As example of its occurence the Aragonite Cave near Ochtiná (Slovakia) can be set out. It was found there in an asbolane profile forming white earthy intercalations or is present in asbolane Mn ochre positions as the admixture. Allophane often occurs as coatings on the walls of abandoned ore mines. It can be also found in pseudokarst ice caves of the Podyjí National Park (the Ledové sluje Caves) in Moravia. The local aggregates form microcascades and flowstone-like structures in which allophane layers alternate with dark brown Al-Fe phosphates, sometimes with BaSo4 enriched laminate. Allophanes of these two localities were recognised by means of laboratory methods, especially electron microprobe analysis, X-ray powder diffraction and thermal analysis. Keywords: allophane; Podyjí National Park; Ochtiná Aragonite Cave Available at various institutes of the ASCR Recent allophane coatings from the karst and pseudokarst caves

Allophane is not often present in karst caves. As example of its occurence the Aragonite Cave near Ochtiná (Slovakia) can be set out. It was found there in an asbolane profile forming white earthy ...

Melka, Karel; Cílek, Václav
Geologický ústav, 2000

Gamma spectrometric and magnetosusceptibility logs from the Frasnian platform limestones (Moravia): indications of their large correlation potential
Hladil, Jindřich; Pruner, Petr; Elwood, B. B.; Jansa, L. F.
2000 - English The study develops two geophysical and interpretation concepts related to the reciprocal lowstand clastic and highstand carbonate sedimentation on Middle to Late Devonian carbonate platforms. The gamma spectrometric and magnetosusceptibility measurements document the lowstand episodes and major phases in dispersal of terrigenous weathering products. Six Frasnian cycles were tested for their global correlation capacity and environmental/paleoclimatic significance. Available at various institutes of the ASCR Gamma spectrometric and magnetosusceptibility logs from the Frasnian platform limestones (Moravia): indications of their large correlation potential

The study develops two geophysical and interpretation concepts related to the reciprocal lowstand clastic and highstand carbonate sedimentation on Middle to Late Devonian carbonate platforms. The ...

Hladil, Jindřich; Pruner, Petr; Elwood, B. B.; Jansa, L. F.
Geologický ústav, 2000

Soil cover of Přední Kobyla site (Bohemian Karst) genesis: role of clay minerals
Žigová, Anna; Šťastný, Martin
2000 - English Soil cover of Přední Kobyla site (Bohemian Karst) is represented by relict soils. Přední Kobyla site is covered by illimerized brown earthifield terra fusca with slight sings of pseudogleization. Fractions  0.01 mm and  0.001 mm from the soil profile are charakterized mainly by kaolinite, illite and quartz. Stage and distribution of plagioclase and feldspar in soil reflect the strong weathering process. In association with clay minerals kaolinite is dominant. Keywords: micromorphology; terra fusca; clay minerals Available at various institutes of the ASCR Soil cover of Přední Kobyla site (Bohemian Karst) genesis: role of clay minerals

Soil cover of Přední Kobyla site (Bohemian Karst) is represented by relict soils. Přední Kobyla site is covered by illimerized brown earthifield terra fusca with slight sings of pseudogleization. ...

Žigová, Anna; Šťastný, Martin
Geologický ústav, 2000

Isotopic composition of carbon and oxygen in platform/reef carbonates of the Moravian Karst: The vertical section shows characteristic patterns related ro sedimentary sequences
Hladil, Jindřich; Hladíková, J.
2000 - English A sequence-related C and O isotope patterns were defined for Devonian platform limestones. In small cycles, the delta 13C and delta 18O values evolve divergently, i.e. from the base to end, the delta 13C values are gradually shifted toward highly positive range, whereas the delta 18O values are gradually shifted to low negative values. A rapid convergence of the delta 13C and delta 18O values terminates the cycle. Sedimentological and diagenetical causes of this and other patterns have been discussed. Available at various institutes of the ASCR Isotopic composition of carbon and oxygen in platform/reef carbonates of the Moravian Karst: The vertical section shows characteristic patterns related ro sedimentary sequences

A sequence-related C and O isotope patterns were defined for Devonian platform limestones. In small cycles, the delta 13C and delta 18O values evolve divergently, i.e. from the base to end, the delta ...

Hladil, Jindřich; Hladíková, J.
Geologický ústav, 2000

Mixed-layer crystal structures of the hydrobiotite type in tuffs of the Doupovské hory Mts. region
Melka, Karel; Adamová, M.; Haladová, I.
2000 - English Mineralogical investigation of mica flakes occuring in tuffs of the Doupovské hory Mts. Was carried out as part of a regional study on volcanistic rocks. The volcanic area of the Doupovské hory Mts. Belongs to the extensive Ohře Rift originated in Early Cenozoic time. The phlogopite-bearing tuff, green-grey in colour, was collected from an outcrop at Oleška near Doupov. Based on geochemical criteria, the volcanistic rock studied contains some tephra clasts derived from alkali basalt-basanite rocks. Keywords: phlogopite-bearing tuff; Oleška near Doupov; regular mixed layer structure; hory; krystalové struktury Available at various institutes of the ASCR Mixed-layer crystal structures of the hydrobiotite type in tuffs of the Doupovské hory Mts. region

Mineralogical investigation of mica flakes occuring in tuffs of the Doupovské hory Mts. Was carried out as part of a regional study on volcanistic rocks. The volcanic area of the Doupovské hory Mts. ...

Melka, Karel; Adamová, M.; Haladová, I.
Geologický ústav, 2000