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S-type characteristics of the Hercynian granitoids of the Central Palaeozoic Massif, Morocco

Published online by Cambridge University Press:  01 May 2009

A. Mahmood  and
A. Bennani
A. Mahmood
Affiliation:
Department of Geology, National School of Mining Engineering (E.N.I.M.), B.P. 753, Agdal-Rabat, Morocco
A. Bennani
Affiliation:
Direction de la Géologie, Ministère, de l'Energie et des Mines, Rabat, Morocco
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Abstract

This petrographic and chemical study of the Hercynian granitoids of the Central Palaeozoic Massif of Morocco covers the Zaër, Ment, Oulmès, 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. The granitoids are generally 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 Al2O3/(CaO + Na2O + K2O) 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.

Type
Articles
Information
Geological Magazine , Volume 121 , Issue 4 , July 1984 , pp. 301 - 309
Copyright
Copyright © Cambridge University Press 1984

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