Dr. Nagy I. Zoltán szerk.: Fragmenta Mineralogica Et Palaentologica 3. 1972. (Budapest, 1972)

lamprophyres carry a considerable amount of quartz, the suggestion has therefore been made that these rocks developed through partial assimilation of granitic country rocks by basic magma. On the basis of the present investigation, this assimilation process could have played an important part in the Velence Hills, moreover the lamprophyric magma may have mingled with granitic one (hybridization). This supposition is favoured by the fact that the intrusion of lamprophyric magma generally follows the emplacement of the granatic body after a relatively small intervall. On the other hand, magmatic evolution in the Velence granite massif must have taken long time judging from Zfisp f

° 20 30 *° *> _ 60 ^ I Maf. A Sarhegy SE Dike • Granite of //?e Ve/ence H/'//s 4- Csa/a Forest D/ke O D/ke occur/ng ar Székesfehérvár Quarry Pig. 4. Mineral composition of lamprophyric dikes compared with that of the granite. 4. ábra. A lamprofiros telérek ásványi összetétele a gránittal összehasonlítva.