Une altération hydrothermale peralumineuse à silicates, phosphates et rutile dans le Protérozoïque supérieur du Saghro (Anti-Atlas, Maroc). Genèse et implications métallogéniques
In the Upper-Proterozoic of Tassa-n-Talghamt (Saghro), a peraluminous hydrothermalism has altered... more In the Upper-Proterozoic of Tassa-n-Talghamt (Saghro), a peraluminous hydrothermalism has altered andesites which are demonstrated belonging to P.II-3 series, the alteration being Middle-P.III. There successive acid inflows, respectively with PO 4 , B and SO 4 , led to the following neogeneses: quartz, andalusite, diaspore, lazulite, muscovite, rutile, tourmaline, svanbergite. The mushroom-shape altered zone would have been induced by fracture-sets bound to shallow intrusives. Comparisons with some other examples led us to infer that, here too, concealed intrusives are of porphyry type and thus possibly mineralyzed either in Cu or Mo, showings of these metals being known in the vicinity, or in Au-Ag
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