Abstract
New major and trace element analyses, Sr-Nd isotopic data and 40K- 40Ar ages on Neogene and Quaternary lavas from Morocco lead to the conclusion that the observed temporal changes from calc-alkaline to transitional and finally alkaline magmatic activity reflect the contributions of distinct sources. According to our model, magmas originally derived from the melting of an European/Western Mediterranean-type asthenospheric mantle source interact during their ascent with either a subcontinental Ronda — Beni Bousera —/type lithospheric mantle (alkaline magmas) or a lithospheric mantle containing a crustal component, and the overlying continental crust (calcalkaline and, to a lesser extent, transitional magmas).
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