PILOTNÍ STUDIUM FLUIDNÍCH INKLUZÍ V SÁDROVCÍCH ZE SEDIMENTŮ MIOCENNÍHO STÁŘÍ U KOBEŘIC
Vol.16,(2009)
Fluid inclusions found in gypsum from Kobeřice told us lot of information about forming conditions during crystallization of crystals of gypsum and confirmed a prognosis of migration of fluids into the sedimentary basin. All microthermometric measurements performed on microthermometric stage mounted on microscope have been done on 0.05 mm thin plates. All measured temperatures including eutectic temperature and temperature of melting of last solid phase (ice) led us to very small salinity of fluids closed inside the inclusions. The salinity was calculated between 0.9 and 2.6 wt. % NaCl eq., which is very small compared to nowadays and Miocene seawater (3.5 wt. %). Parent fluids which are responsible for crystalization of gypsum crystals could be interpreted most likely as mixing sea water with a more diluted fluid (meteoric water?).
Miocene sediments; gypsum; fluid inclusions
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