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Tran Au-Ag±W deposit in Western Bulgaria: a new Intrusion-Related Gold System in the Variscan belt of Europe
Irena Peytcheva, Dimitrina A. Dimitrova, Peter Marchev, Atanas Hikov, Elitsa Stefanova, Stefan Metodiev, Albrecht von Quadt, Kalin Kouzmanov, Robert A. Creaser
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Abstract
New data for the magmatism, hydrothermal alteration, mineralization styles, isotope geochronology, mineralogy, fluid-inclusionsand elemental geochemical associations are combined in the present study to characterize the Tran Au- Ag±W deposit in Western Bulgaria. The main features of the deposit define it as intrusion-related gold system (IRGS): its association with reduced plutons; well-defined structural control on intrusion and mineralization; diverse mineralization styles, including veins, stockworks, dissemination; wide range of gold grades; approximately coeval magmatism and mineralization at 330-333 Ma; low sulfide content; apparent correlation of Au and Bi; and the presence of СО2 in hydrothermal fluids. These characteristics are useful for further prospecting for IRGS in the Variscan Belt of Eastern Europe.