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Abstract
The two rock series identified in the Naim massif by de Waard & Wheeler ( Lithos 4, 1971) differ fundamentally in their silica saturation and potassium content. It is suggested that the two series instead of having a single parent magma, may represent two parents, one essentially low-K, high-alumina basalt with FeO:MgO near 1, and the other essentially andesitic. The apparent continuity of trends between the two rock series may be fortuitous in that the basic differentiates of the more acid magma show mineralogical and chemical trends toward the critically undersaturated suite because of their common P-T environment of crystallization.
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