Abstract
The Guevgueli igneous association and the Ballons massif are intrusive into a rhyolitic volcaniclastic series. They both contain gabbro-dioritic cumulates and abundant magmatic breccias containing melanocratic microgranular and leucocratic granular rocks. Two distinct parageneses, formed under different PH <sub>2</sub> O, one with bytownite, the other with amphibole + or - biotite + or - ferro-titanian oxides, control the magmatic differentiation processes. Structural studies reveal diastrophisms which favoured a water contribution from the sialic country rocks during magmatic crystallization. An emplacement in continental fractures accounts for the distinctive features of these rocks.
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