Abstract
Abstract In northwestern Meseta, the Sidi-Said Maâchou volcanic complex includes dykes, sills and basaltic flows. This volcanism is synchronous with a Paradoxides schist deposit. Most of the rocks have been affected by post-magmatic alteration processes, which have modified their major and trace elements composition. The geochemical characteristics can be discussed on the basis of the high field strength elements, transition elements, Th, Ta and rare earth elements. Hence, the Sidi-Said Maâchou dolerites consist of within-plate alkali volcanism. This volcanism and those recognised in the Anti-Atlas, High-Atlas and eastern Meseta suggest a Cambrian extensive episode during the break-up of the palaeo-Gondwana supercontinent.
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