Abstract

This study of the Hercynian granitoids of the Central Palaeozoic Massif of Morocco covers the Zaer, Ment, Oulmes, and Moulay Bouazza plutons. These plutons are formed of biotite or two-mica, quartz-rich granodiorites and monzogranites containing reddish-brown, inclusion-rich biotites as the only essential mafic mineral; zoned plagioclase; and perthitic K-feldspar. The modal contents of micas and K-feldspar are highly variable. Medium to coarse grained, massive; however foliated varieties are also commonly found, particularly at the contact of the plutons with sedimentary rocks. The strongly peraluminous character of the granitoids is shown by high normative corundum and high molar Al 2 O 3 /(CaO+Na 2 O+K 2 O) ratio, and is reflected by the occasional presence of aluminosilicates. The mineralogical and chemical characteristics of the granitoids are similar to those of the S-type granites, and were inherited from the crustal source of the granitic magmas which are thought to have been generated by partial equilibrium fusion of the sandy argillaceous sediments of the Massif. The heat source for the fusion might have been provided by intrusion of mantle-derived material. --Modified journal abstract.

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