Hydrotermální asociace na žilách v klastických horninách spodního karbonu Drahanské a Zábřežské vrchoviny: genetické aspekty
| Autoři | |
|---|---|
| Rok publikování | 2005 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | Geologické výzkumy na Moravě a ve Slezsku |
| Fakulta / Pracoviště MU | |
| Citace | |
| Obor | Geologie a mineralogie |
| Klíčová slova | Drahany Upland; hydrothermal veins |
| Popis | Hydrothermal veins occurred in the Lower Carboniferous siliciclastics of the Drahany and Zábřeh Upland. The older vein system, most likely late Variscan, has mineral assemblage: quartz ą calcite ą chlorite ą sulphides (pyrite). Minerals display a severe deformation and calcites are fine grained with a low intensity of cathodoluminescence. Post-Variscan generations of veins have the mineral assemblage with calcite - barite - sulphides (sphalerite, galena, chalcopyrite, pyrite-markazite) ą quartz ą fluorite ą siderite. The main post-Variscan population of calcites precipitated from solutions of H2O - NaCl ą CaCl2 ą KCl ą MgCl2 ą FeCl2 type under low temperatures within a range of 60-90C. One of the younger aqueous hydrothermal systems contain also higher liquid hydrocarbons. Isotopic composition of parent fluids were about values of d18O from 0 to 10 SMOW, what is indicative for transformed basinal brines originated from sea or partly meteoric waters. |
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