In the westernmost part of the High Atlas, two Palaeozoic formations, rich in mafic volcanic rocks, are distinguished. They belong to different structural blocks created during the Variscan orogeny. New U–Pb dating yields an Early Cambrian age. The basaltic lavas have the composition of continental tholeiites and the magmatic signature of an initial rifting tectonic setting. They are related to the western Moroccan Cambrian rift. Their geodynamical context could be a passive margin initiated from an active rift that aborted in the Middle Cambrian.

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Permian volcanic Chougrane-El Had the Bouhsoussène complex (central Morocco), manifested primarily by volcanic rocks rhyodacites nature and basalt intercalated in the clay-greso-conglomeratic permian deposits. These are rocks texture in general microlitic to porphyry. Basalts consists of a primary paragenesis formed of plagioclase, pyroxene, olivine and quartz and a secondary mineral assemblage consisting of muscovite, calcite, chlorite and quartz. The rhyodacites show primary paragenesis formed of plagioclase, pyroxene and quartz and a secondary mineral assemblage consisting of calcite and sericite. Petrographic characteristics of these rocks are comparable to those of the Permian volcanic complex Khénifra and Tiddas-Sebt Ait Ikkou (Central Morocco). Area Chougrane-El Had the Bouhsoussène created on intracontinentale tear in the Asturian phase (Michard, 1976) recorded three volcanic episodes, two major eruptive episode and a third in vein deposit mode. RésuméLe complexe volcanique permien de Chougrane-El Had des Bouhsoussène (Maroc Central), se manifeste essentiellement par des roches