FLUID INCLUSION CHARACTERISTICS AND PALEOTHERMAL STRUCTURE OF THE ADULARIA-SERICITE TYPE EPITHERMAL DEPOSIT AT TELKIBANYA, TOKAJ MTS., NORTHEAST HUNGARY

Year, pages: 1995, 205 - 215

Fluid inclusion data for quartz, adularia, calcite and sphalerite related to mineralization hosted by Neogene volcanic rocks at Telkibanya in northeast Hungary indicate that the temperature varied between 270 C and 130 C during hydrothermal activity. Intensive boiling of fluids took place at about 230 C, and the apparent salinity of the hydrothermal solution was ≤ 5 NaCl equiv. wt. %. The CO₂-content of initial solutions (pre-boiling fluids on 240−250 C) was about 0.8 mol/kg on the basis of the model calculations. As a consequence of boiling, a vapour-rich, nearly isothermal system developed in the vuggy-brecciated zones of host rocks around ore veins. Euhedral quartz that precipitated in these zones is morphologically different from the vein-filling quartz aggregates. Homogenization temperatures indicate that the quartz veins formed under non-isothermal conditions. The paleotemperature distribution was reconstructed on the basis of the spatial distribution of average homogenization temperatures of quartz vein samples, and taking into account the level differences of sampling. A comparison of the paleotemperature map with the volcanotectonic map indicates that some of the areas of high paleotemperature are located along the major faults mapped in the studied area. The spatial coincidence of some of these thermal centres with the area of the highest residual Bouguer-anomaly values suggests that the heat source of the hydrothermal convection cells was a subvolcanic intrusion. The minimum depth under the paleowater table of the mineralization now exposed at the surface was about 200−440 m.

Molnar, F., Zelenka, T. 1995. FLUID INCLUSION CHARACTERISTICS AND PALEOTHERMAL STRUCTURE OF THE ADULARIA-SERICITE TYPE EPITHERMAL DEPOSIT AT TELKIBANYA, TOKAJ MTS., NORTHEAST HUNGARY. In Geologica Carpathica, vol. 46, no.4, pp. 205-215. 1335-0552.

Molnar, F., Zelenka, T. (1995). FLUID INCLUSION CHARACTERISTICS AND PALEOTHERMAL STRUCTURE OF THE ADULARIA-SERICITE TYPE EPITHERMAL DEPOSIT AT TELKIBANYA, TOKAJ MTS., NORTHEAST HUNGARY. Geologica Carpathica, 46(4), 205-215. 1335-0552.