Du cycle orogénique hercynien au pré-rifting de l'Atlantique central au Maroc occidental : les microdiorites des Jbilet sont-elles des marqueurs magmatiques de ce passage ?
Nasrreddine Youbi , Hervé Bellon , Arnaud Marzin , Alain Piqué , Joseph Cotten , Bruno Cabanis
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引用次数: 17
Abstract
Microdioritic intrusives crosscut the Hercynian structures of the Jbilet massif in the western Morocco. Their mineralogical, petrological and geochemical compositions display the main characteristics of calc-alkaline magmas and any of the alkaline ones. This magmatic event occurred at ca 255 Ma, as indicated by the 40K–40Ar age of fresh kaersutite crystals, but seven ages for whole-rock samples, scattered between 231 and 180 Ma, reflect the general rejuvenation of the ages linked to a latter penetrative alteration event of their feldspars and groundmass.
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