Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 66. (Budapest 1974)

Embey-Isztin, A.: Petrochemistry of the dike-rocks in the Velence Hills (Hungary)

and they have much Sr+Ba due to their high temperature of origin. Granite porphyries having much lower values of K

2

0/Na

2

0 also form a separate group. The ratio of Sr/Ba is 0.18 in aplites of replacement type and it is 0.10 in aplites of dilatation-injection type. From the foregoing discussion it is apparent that the two types of aplite cannot have a common origin as it was stated by VENDL (1914). Fig. 4A — B. Oxide percentage — DI diagram of the acid dike-rocks. Straight lines represent the axes of frequency histograms drawn after THORNTON & TTJTTLE (1960). 1 — granite, 2 = replacement aplite, 3 = dilatation-injection aplite, 4 — granite porphyry (Pátka type), 5 = granite porphyry (Sukoro type). Fig. 5. Sr+Ba — K,0/Na

2

0 diagram of the acid dike-rocks. 1 = granite porphyry, 2 = replacement aplite, 3 = dilatation-injection aplite, double symbols: average.