. "Mat\u00FDsek, Dalibor" . "Osovsk\u00FD, Michal" . "Gabrhelov\u00E1, Pavla" . . "RIV/61989100:27350/14:86090119" . "27350" . "Siderite concretion horizon above the No. 22 Coal Seam in the Upper Such\u00E1 Member of the Czech part of the Upper Silesian Basin"@en . "Bulletin mineralogicko-petrologick\u00E9ho odd\u011Blen\u00ED N\u00E1rodn\u00EDho muzea v Praze" . . "[DCA5713BAB8E]" . . "Siderite concretion horizon above the No. 22 Coal Seam in the Upper Such\u00E1 Member of the Czech part of the Upper Silesian Basin"@en . "3"^^ . "36056" . . . "1211-0329" . . . . "RIV/61989100:27350/14:86090119!RIV15-MSM-27350___" . . . "5"^^ . . "Sideritov\u00E9 konkrece jsou zn\u00E1my z paralick\u00FDch i terestrick\u00FDch sediment\u016F hornoslezsk\u00E9 p\u00E1nve. V\u00FDznamn\u00FD horizont nad 22. sloj\u00ED svrchn\u00EDch su\u0161sk\u00FDch vrstev (westfal, pennsylvan) byl zkoum\u00E1n geologick\u00FDmi, mineralogick\u00FDmi a geochemick\u00FDmi metodami." . . "Pelokarbon\u00E1tov\u00FD horizont nad 22. sloj\u00ED ve svrchn\u00EDch su\u0161sk\u00FDch vrstv\u00E1ch \u010Desk\u00E9 \u010D\u00E1sti hornoslezsk\u00E9 p\u00E1nve"@cs . . "Jir\u00E1sek, Jakub" . "10"^^ . . . "Pelokarbon\u00E1tov\u00FD horizont nad 22. sloj\u00ED ve svrchn\u00EDch su\u0161sk\u00FDch vrstv\u00E1ch \u010Desk\u00E9 \u010D\u00E1sti hornoslezsk\u00E9 p\u00E1nve" . . "2" . "22" . "Sideritov\u00E9 konkrece jsou zn\u00E1my z paralick\u00FDch i terestrick\u00FDch sediment\u016F hornoslezsk\u00E9 p\u00E1nve. V\u00FDznamn\u00FD horizont nad 22. sloj\u00ED svrchn\u00EDch su\u0161sk\u00FDch vrstev (westfal, pennsylvan) byl zkoum\u00E1n geologick\u00FDmi, mineralogick\u00FDmi a geochemick\u00FDmi metodami."@cs . "CZ - \u010Cesk\u00E1 republika" . "Sivek, Martin" . "Siderite concretion horizons are known both from the paralic and terrestrial sediments of the Upper Silesian Basin. Significant horizon above the No. 22 Coal Seam in the Upper Such\u00E1 Member of Karvin\u00E1 Fm. (Westphalian, Pennsylvanian) was investigated by geological, mineralogical and geochemical methods. Horizon is developed virtually in the whole area of the Upper Such\u00E1 Member, where geological documentation is available. It is hosted by grey claystones in the direct roof of the No. 22 Seam, which belongs to the freshwater Faunistic Horizon Group Hubert. Shape of the concretions is mostly ellipsoidal and lensoidal, tabular ones are also present. Their size usually ranges between X0 cm and 1 m. Concretions do not have internal layering, warping of the claystone layering around them was observed. Typical feature of concretions is presence of septarian cracks. Matrix of the concretions is formed almost purely by two populations of non-zoned Mg-Ca or Mg-rich siderite with dispersed quartz, mica and accessory minerals similar to surrounding claystones, i.e. apatite, zircon, monazite and TiO2 minerals. Septarian fissures are filled by two generations of carbonate with predominant dolomitic composition and beef (fibrous) structure. Older one has dark brown colour, younger is white. The 13C value of matrix siderite is +0.77 promile PDB and that of septarian dolomite -8.15 promile PDB, the 18O value of matrix siderite is -11.25 promile PDB and that of septarian dolomite -9.79 promile PDB. Siderite matrix data shows fractionation during diagenetic processes, while fissure carbonate represents post-sedimentary hydrothermal product. Dolomite isotope data are comparable to those of hydrothermal carbonate mineralization of Early Carboniferous of the N\u00EDzk\u00FD Jesen\u00EDk Mts. We interpret concretion horizon as sediment of internal part of large-scale freshwater lake. Concretions are very probably syncompactional and develop by pervasive growth mechanism."@en . "Pelokarbon\u00E1tov\u00FD horizont nad 22. sloj\u00ED ve svrchn\u00EDch su\u0161sk\u00FDch vrstv\u00E1ch \u010Desk\u00E9 \u010D\u00E1sti hornoslezsk\u00E9 p\u00E1nve"@cs . "Pelokarbon\u00E1tov\u00FD horizont nad 22. sloj\u00ED ve svrchn\u00EDch su\u0161sk\u00FDch vrstv\u00E1ch \u010Desk\u00E9 \u010D\u00E1sti hornoslezsk\u00E9 p\u00E1nve" . "S" . . "mineralogy; sedimentology; septarian concretions; Late Carboniferous; Upper Silesian Basin"@en .