ENCLAVES AND FAYALITE-BEARING PEGMATITIC ''NESTS'' IN THE UPPER PART OF THE GRANITE INTRUSION OF THE VELENCE MTS., HUNGARY

Rok, strany: 1993, 143 - 153

Along the Balaton-Velence fault zone there are a few hypabyssal, small, Variscan (280 mil.years) S-type granitic intrusions. Only one outcrop on the surface is in the Velence Mts. This monzogranite crystallized from a nearly eutectic water-saturated melt at approximately 680 °C, 200 MPa. The granite contains basic magmatic enclaves, metapelitic xenoliths, and fayalite-bearing pegmatitic nests. The basic enclaves represent a primitive magma, with evidence of alteration by the enclosing granitic melt. The metapelitic xenoliths were embedded from the former andalusite hornfels, recrystallized and partially fused in the granitic melt at a pressure and temperature similar to the enclosing granite. The fayalite-bearing pegmatitic nests crystallized at lower temperature (540 °C, 200 MPa) in the upper part of the granite intrusion. Due to the falling temperature and metapelitic xenoliths, locally the oxygen fugacity decreased and quartz, fayalite and K-feldspar crystallized instead of annite-rich biotite.

ISO 690:

Buda, G. 1993. ENCLAVES AND FAYALITE-BEARING PEGMATITIC ''NESTS'' IN THE UPPER PART OF THE GRANITE INTRUSION OF THE VELENCE MTS., HUNGARY. In Geologica Carpathica, vol. 44, no.3, pp. 143-153. 1335-0552.

APA:

Buda, G. (1993). ENCLAVES AND FAYALITE-BEARING PEGMATITIC ''NESTS'' IN THE UPPER PART OF THE GRANITE INTRUSION OF THE VELENCE MTS., HUNGARY. Geologica Carpathica, 44(3), 143-153. 1335-0552.