Vývoj povariských fluid v lomech u Nejdku, Jakubčovic a Bohučovic v Nízkém Jeseníku

Roč.13,(2006)

Abstrakt
Two different types of fluid were described in studied post-Variscan vein mineralization from Nejdek, Jakubčovice and Bohučovice quarries. First high salinity (between 18 and 28 wt. % NaCl eq.) and low temperature (ranging from 50 to 140 °C) fluids of H2O-NaCl-CaCl2 (±MgCl2) type, present in dolomite, sphalerite and calcite I, II, was originated from the highly evaporated seawater. Second low salinity (between 0 and 9 wt. % NaCl eq.) and low temperature (ranging from 40 to 80 °C) fluids of H2O-NaCl (±KCl) type, present in calcite III, was originated from the less evaporated seawater. Fluids represent moderate mixing with the sea or meteoric water and they also indicate slight to progressive interaction with the rocks (mainly illitization, dissolution of K-feldspar and albitization).

Klíčová slova:
Nízký Jeseník Upland; fluid chemistry; fluid inclusions; stable isotopes
Reference

Bodnar, R. J. (1993): Revised equation and table for determining the freezing point depression of H2O-NaCl solutions. – Geochim. Cosmochim. Acta, 57, 683-684.
Borisenko, A. C. (1977): Determination of salt composition of the solutions of fluid inclusions in minerals using cryometry. – Geology and Geophysics, 8, 16-27.
Davis, D. W. – Lowenstein, T. K. – Spencer, R. J. (1990): Melting behavior of fluid inclusions in laboratory-grow halite crystals in the system NaCl-H2O, NaCl-KCl-H2O, NaCl-MgCl2-H2O and NaCl-CaCl2-H2O. – Geochim. Cosmochim. Acta 54, 591–601.
Deines, P. – Langmuir, D. – Harmon, R.S. (1974): Stable carbon isotope ratios and the existence of a gas phase in the evolution of carbonate ground waters. – Geochim. Cosmochim. Acta, 38, 1147-1164.
Dolníček, Z. – Zimák, J. – Slobodník, M. – Malý, K. (2003): Mineralogy and formation conditions of the four types of hydrothermal mineralization from the quarry in Hrubá Voda (Moravo-Silesian Culm). – Acta Univ. Palack. Olom., Fac. Rer. Nat., Geol. 38, 7-22. Olomouc
Kučera, J. (2004): Hydrotermální mineralizace v břidlicových souvrstvích spodního karbonu Nízkého Jeseníku. – Geol. výzk. Mor. Slez. v r. 2003, 11, 51-54. Brno.
McCaffrey, M. A. – Lazar, B. – Holland, H. D. (1987): The evaporation path of seawater and the coprecipitation of Br and K with halite. – J. Sedim. Petrol., 57, 928-937.
Ohmoto, H. – Rye, R. O. (1979): Isotope of sulfur and carbon. – In: Barnes, H. L. (ed.): Geochemistry of hydrothermal deposits, John Wiley & Sons, 509-567.
O‘Neil, J. R. – Clayton, R. N. – Mayeda, T. K. (1969): Oxygen isotope fractionation in divalent metal carbonates. – J. Chem. Phys., 51, 5547-5558.
Slobodník, M. – Dolníček, Z. (2001): Základní charakteristika fluid z hydrotermální mineralizace u Hrabůvky, Nízký Jeseník. – Geol. výzk. Mor. Slez. v r. 2000, 52-54. Brno.
Slobodník, M. – Muchez, P. – Viaene, W. (1995): Mikrotermometrické studium žilné mineralizace v kulmu u Domašova nad Bystřicí. – Geol. výzk. Mor. Slez. v r. 1994, 72-73. Brno.
Spirakis, C. S. – Heyl, A. V. (1988): Possible effects of thermal degradation of organic matter on carbonate paragenesis and fluorite precipitation in Mississippi Valley-type deposits. – Geology, 16, 1117-1120.
Zheng, Y. F. (1999): Oxygen isotope fractionation in carbonate and sulfate minerals. – Geochem. J., 33, 109-126.
Zimák, J. – Losos, Z. – Novotný, P. – Dobeš, P. – Hladíková, J. (2002): Study of vein carbonates and notes to the genesis of the hydrothermal mineralization in the Moravo-Silesian Culm. – Journal of the Czech Geological Society, 47, 3-4, 111-122.

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