Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 65. (Budapest 1973)

Embey-Isztin, A.: On the problem of graphic intergrowth and normal granitic structure

Q Fig. 6. Normative composition of aplitic microgranite, aplite dikes of metasomatic type (triangles) and aplite dikes of injection type (squares) as well as the basal granite (circle), The minimum melting area is drawn after TUTTLE and ROWEN (1958) minimum melting area, while aphtes of an injection character lie outside of this area, on the orthoclase-quartz side. In conclusion, it can be said that metasomatic processes, especially the replacement of feldspar by quartz, played an essential role in the postmagmatic evolution of the fine grained border zone, and in some of the aphte dikes of the Velence Hills. It goes without saying that in the early stages of crystallization a magmatic phase of evolution has to be assumed. References AUGUSTITHIS, S. S. (1962) : Non-eutectic, graphic, micrographie and graphic-like "myrmekitic" structures and textures — Bear. Mineral. Betrog., 8: 491-498. BUDA, GY. (1969): Genesis of the granitoid rocks of the Mecsek and Velence Mountains on the basis of the investigation of the feldspars. — Acta Geol. Ac. Sei. Hung., 13: 131-155. DRESCHER-KADEN, F. K. (1948): Die Feldspat-Quarz Reaktionsgefüge der Granite und Gneise. — Berlin-Göttingen-Heidelberg, p. 1-259. ERDMANNSDÖRFFER, O. H. (1947): Metasomatische Vorgänge bei der Granitbildung. — Fortschr. Miner., 26: 61-64. FERSMANN, A. E. (1928): Die Schriftstruktur der GranitPegmatite und ihre Entstehung. — Z. Krist., 69: 77-104. GOKHALE, N. W. (1965): A Velencei-hegység gránit és metamorf kőzeteinek vizsgálata. — Manuscript. GOODSPEED, G. E. (1940): Dilatation and replacement dikes. — J. Geol., 48: 175-195.