Petrography and Mineral Chemistry of Rhönite in Ocelli of Alkali Basalt from Villány Mts, SW Hungary
Reference:
Acta Mineralogica-Petrographica, Szeged 2003, Vol. 44, pp. 51-56
Szerző:
Zsuzsanna Nédli
Dr. Tivadar M. Tóth
Abstract:
In ocelli of alkali basalts from the Villány Mts (SW Hungary) rhönite has been found recently. This is among the first reports of rhönite fromocelli in basaltic dykes, as well as from the southern part of the Pannonian Basin. This new occurrence of rhönite has been analysed anddescribed in this paper, in light of the hypotheses of formation of ocelli and crystallisation conditions of rhönite. On the basis of texturalobservations and mineral chemistry, we suggest that the ocelli was formed in the late stage of the crystallisation of magma, near the Earth'ssurface, at relatively high temperature but low pressure. Rhönite in ocelli crystallised as a primary phase in these conditions.
