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The Madjarovo volcanic complex and ore district comprise alteration styles from potassium silicate, advanced argillic and sericite alteration to adularia–sericite alteration/mineralization with a close and unambiguous spatial relationship to specific magmatic events. New 40Ar/39Ar laser fusion and incremental heating experiments on nine sanidine, biotite, adularia, K-feldspar, and alunite samples constrain the ages and time span of lavas and tephras comprising the complex and their relationship to the hydrothermal activity. These results demonstrate that high-K calc-alkaline to shoshonitic volcanic activity began c.32.7 Ma and terminated c.500 ka later with the extrusion of quartz latite lavas...

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