Barytová mineralizace v granodioritovém porfyritu z Bělovsi u Náchoda (orlicko-sněžnické krystalinikum, Česká republika)
| Autor: | Michal Kovář, Zdeněk Dolníček |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Bulletin Mineralogie Petrologie. 28:86-93 |
| ISSN: | 2570-7345 2570-7337 |
| Popis: | A new occurrence of baryte mineralization at Běloves near Náchod is bound to a steep NNE-SSW trending fissure in a dyke of granodiorite porphyrite, which cut phyllites of the Nové Město Group (Orlica-Sněžník Crystalline Complex). The mineralization is composed of three generations of baryte differing in Sr contents (~0.10 apfu in the oldest generation, ~0.003 apfu in the youngest generation) and small amount of hematite. The primary fluid inclusions in baryte belong to type L and L+V; the variable phase proportions are probably caused by postdepositional damage of part of the present fluid inclusions. The wide range of temperatures of both initial melting (-40 to -1 °C) and final ice melting (-0.3 to -12.3 °C) suggests involvement of fluids with very variable salt systems and salinities. The δ34S values of baryte range between +5.5 and +7.1 ‰ CDT. The mineral composition, chemical composition of minerals and fluid inclusion data suggest that the studied mineralization is similar to Late Variscan vein baryte and mineralizations of the Bohemian Massif. The source of fluids is interpreted in evaporated fresh waters of Permian lakes, which occurred in the adjacent Krkonoše Piedmont Basin during the Permian. |
| Databáze: | OpenAIRE |
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