Geneze křemenných žil u Velké Kraše v sileziku

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Title in English Origin of quartz veins near Velká Kraš in the Silesicum
Authors

SLOBODNÍK Marek PŘICHYSTAL Antonín MORÁVEK Rostislav

Year of publication 2010
Type Article in Periodical
Magazine / Source Geol. výzk. Mor. Slez.
MU Faculty or unit

Faculty of Science

Citation
Field Geology and mineralogy
Keywords Silesicum; quartz; fluid inclusions; oxygen isotopes
Description Fluid inclusions from the vein quartz near Velká Kraš have been investigated. Inclusions with two immiscible liquids, aqueous (L1) and carbonic (L2) one, have been found so far. Most of inclusions have a stable ratio of both liquids (L2/L1 = 0,1). Based on petrographic observation we could state that fluids might be trapped close to the one phase and two phase boundary of the H2O-NaCl-CO2 system. The two cogenetic fluid inclusions, with immiscible CO2-rich and H2O-rich fluid phases, have been used for an estimation of the p-T conditions. The temperature 320 degC and presure 2050 bars could be a lower limit for the precipitation of the quartz. The salinity of the aqueous solution is 4,5 mass% NaCl eq. The trapped fluids show a nature of the pegmatite post-magmatic solutions.
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