DOKLAD AKTIVITY NÍZKOTEPLOTNÍCH Ca-Na-Cl SOLANEK VE FELDSPATITIZOVANÝCH GRANITECH ŽIVCOVÉHO LOŽISKA KRÁSNO (MASIV KRUDUM)
Roč.19,č.1-2(2012)
The quartz-fluorite NNW–SSE trending vein mineralization hosted by alkali-feldspar syenites and leucocratic topaz-albite granites of the Vysoký Kámen stock (Krudum granite body) formed from low-salinity (0–5 wt. % NaCl eq.) and low-temperature (Th =90–132 °C) aqueous fluids. Both quartz and fluorite host secondary fluid inclusions which contain high-salinity (16–26 wt. % NaCl eq.) low-temperature (Th = 89–138 °C) Ca-Na-Cl brines. Two compositional subtypes of brines can be identified (Na-rich hosted by FI in fluorite and Ca-rich hosted by FI in quartz). The microthermometric parameters of brine-bearing fluid inclusions are fully comparable to the high-salinity fluids that participated during formation of many types of vein mineralizations during the post-Variscan period in the Bohemian Massif. The brines probably migrated along the adjacent NNW–SSE trending Vysoký Kámen fault.
Karlovy Vary pluton; Krudum granite; post-magmatic alteration; fluorite; Na-Ca-Cl brines; fault
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