Geochemistry of highly saline fluids in the Moravo-Silesian Palaeozoic siliciclastic sequences: genetic implications

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Authors	KUČERA Jan MUCHEZ Philippe SLOBODNÍK Marek PROCHASKA Walter
Year of publication	2009
Type	Article in Periodical
Magazine / Source	International Journal of Earth Sciences
MU Faculty or unit	Faculty of Science
Citation
Field	Geology and mineralogy
Keywords	Moravo-Silesian Palaeozoic; sedimentary sequences; dolomite veins; fluid chemistry; stable isotopes; water-rock interaction
Description	Post-Variscan dolomites occur in Zn-Pb-Cu veins, Crush-leach, stable isotope (oxygen and carbon) and microthermometry analysis of the fluid inclusions in dolomites, Highly saline H2O-NaCl-CaCl2-MgCl2 fluids occur in inclusions, isotopic fluid composition indicate that the fluid was derived from evaporated seawater, rock-buffering explains the isotopic composition at low w/r ratios, fluid-rock interactions largely controlled the fluid chemistry (K, Li, Br and Na contents, K/Cl, I/Cl and Li/Cl molar ratios). A permeable basement and fractured sedimentary sequence enhanced the general nature of the fluid system. Fluid characteristics are comparable with the main post-Variscan fluid flow systems in the Polish (Cracow-Silesian ore district) and German sedimentary basins.
Related projects:	Geochemical and tectonic model of fluid migration in the paleozoic of Moravo-Silesian region Interactions among the chemicals, environment and biological systems and their consequences on the global, regional and local scales (INCHEMBIOL)