Abstract
Isotopic analyses of oxygen and crush-leach analyses of fluid inclusions were applied to quartz gangue from auriferous mineralization at three localities in the vicinity of Hory near Předín („Zákopy“, „Štůlně“, and „Malý Štítek“). Oxygen isotope composition of the ore-forming fluids varies between -8.1 and +0.9 ‰ SMOW. Dominant anion in fluid inclusions is Cl, whereas Ca, K, and Na are predominant cations. The halogen molar ratios are rather variable (Br/Cl = 0.8–2.1 10-3; I/Cl = 34–341 10-6). The variability in composition of fluids is probably caused by mixing of several genetic types of water. It is supposed that the main source of oreforming fluids is meteoric water which has typically negative δ18O values. This type of water mixed with fluids which are related to evaporation of seawater, dissolution of evaporites, magmatogenic water and/or shield brines.
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