Szakáll Sándor - Weiszburg Tamás szerk.: A telkibányai érces terület ásványai (Topographia Mineralogica Hungariae 2. Miskolc, 1994)

A telkibányai ércesedés genetikája folyadékzárvány vizsgálatok alapján (Molnár Ferenc)

Topographia Mineralogica Hungáriáé Vol. II. 113-131 Miskolc, 1994 A TELKIBÁNYAI ÉRCESEDÉS GENETIKÁJA FOLYADÉKZÁRVÁNY VIZSGÁLATOK ALAPJÁN* Genetical peculiarities of the Telkibánya ore deposit on the basis of fluid inclusion studies Molnár Ferenc Abstract Systematic fluid inclusion micro thermometry study has been carried out on various minerals (quartz, adularia, calcite, sphalerite) occurring in the ore deposit. The main conclusions are as follows: 1. The temperature of hydrothermal activity varied between 130 °C and 265 °C. 2. The hydrothermal processes took place in three stages. a. ) In the high temperature stage (240-265 °C) sulphides, the adularia-bearing parageneses and some quartz-carbonate infillings were precipitated. The composition of hydrothermal solutions was NaCl-CaCl2-H20-type with total concentration about 2.5 NaCl equiv.wt.%. b. ) The second stage of hydrothermal activity was characterized by intensive boiling of fluids. This process was responsible for the development of a nearly isothermal (230 °C) vapour-dominated system enriched in gaseous compounds. The appearence of sulphate-(bi)carbonate-type fluids with very low total concentrations probably was related to the condensation and oxidization processes in that vapour-rich system. c. ) In the late stage the temperature of system was below 215 °C. The most characteristic processes were the cooling and the dilution of hydrothermal fluids. 3. The minimal palaeodepth of the ore deposition was between 300 and 400 metres. 4. The structure of the palaeotemperature field of the Telkibánya ore deposit (compiled from the fluid inclusion data) does not show relationships to the volcanic centres recognized in the studied area. The high temperature areas show some connections to the main tectonic lines. The heat source of the hydrothermal system could be a subvolcanic intrusion situated below the central part of the mineralization. 1. Bevezetés A telkibányai ércesedés földtani-teleptani kutatási eredményeinek összefoglalása a jelen kiadvány előző fejezeteiben található. Ezen dolgozatban a telkibányai ércesedés kialakulásával kapcsolatban a következő kérdésekre keresünk válaszokat: * A cikk a Magyar Tudományos Akadémia Tudományos Minősítő Bizottsága által 1991-ben kiírt pályázaton II. díjat nyert munka rövidített, átdolgozott változata.