Abstract
Fluid inclusion studies and vitrinite reflectance measurements were performed to establish temperatures of alteration processes that affected Carboniferous, older Paleozoic, and Precambrian basement rocks of the Fore-Sudetic Monocline of southwest Poland. Surprisingly high temperatures determined for these processes (ranging from 180 to 350°C), and the locally extensive alteration indicate the importance of geothermal influence. The high-temperature geothermal field of the Fore-Sudetic Monocline shows various heat anomalies related to paleohighs and strongly tectonically disturbed basement. These anomalies are spatially related to the areas of known Zechstein base metal occurrences of the Kupferschiefer type. It is suggested that one controlling factor leading to the formation of the Kupferschiefer mineralization was the availability of thermal energy. Mobilization and gradual preconcentration of base metals during the Late Variscan was due to anomalous heat flow related to Variscan plate motions. This Variscan heat flow is considered to be mainly convective.
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