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In a previous work (Lucchini, Morten e Rossi, 1971) a study on K/Rb ratios for the intrusive complex of Predazzo was performed, and it was noticed that R remained mainly constant during the main differentiation process—from gabbros to syenites; only in the granitic rocks it was a strong decrease of R noticed. This decrease was ascribed both to deuteric and to differentiation phenomena. The present work, a study of R on the potassic minerals of granites (biotites and perthites), proves that the decrease...
The outcrops examined are to be found near the oasis of Djanet in Eastern Hoggar (Algerian Sahara). The field observations coupled with petrochemical and radiometric data have led to the recognition of a patch of an Early Ordovician rhyolitic flow (478 m.y.) overlying the granite. This is responsible for the thermo-metamorphism of the rocks of the Pharusian series into which it intruded 90-40 m.y. before the effusion. Thus the denudation of the granitic massif and the formation of the Saharian plateau...
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