Abstract

This investigation is aimed at defining the geochemical behaviour of trace elements and gases in deep granitic geothermal systems in southwest Bulgaria. The influence of recent volcanic events on water-rock interaction in these systems is studied. The enrichment with CO2 imposes an important influence on the fluid composition and these modifications have important indicator possibilities. The processes of “water-rock” interaction lead to concentration of many trace elements in the aqueous phase. The experimental simulation of granite leaching yields the typical trace element rich aqueous phase, highlighting the secondary nature of the influence of the volcanic emanations. The complex modification of the composition is a reflection of the processes (primary and secondary) acting on the thermal fluid at depth.

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