New major and trace element analyses, Sr-Nd isotopic data and K-40-Ar-40
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 (calc-alkaline and, to a lesser extent, transitional
magmas). ( (C) Academie des sciences/Elsevier, Paris.).