The submitted Diploma thesis deals with heavy mineral assemblage in pyroclastic rocks of Southern Slovakia. In theoretical part, some general problem of alkali basalt volcanism in Southern Slovakia, geology of the studied area, as well as the structure and the origin of basalt maars a diatremes are summarized. Practical part of the submitted thesis is dedicated to definition of heavy mineral association as well as chemical composition and classification of minerals. Special attention was paid to garnets, pyroxenes, apatites and zircons, whose origin and possible source rocks have been deciphered from chemical composition and crystalochemistry. Submitted thesis also deals with U-Pb and (U-Th)/He geochronology of zircon and apatite and grain-size analyses of pyroclastic rocks.