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Geochemical evolution of the Jarawa Younger Granite complex and its related mineralization, northern Nigeria

Published online by Cambridge University Press:  01 May 2009

E. G. Imeokparia
E. G. Imeokparia
Affiliation:
Geology Department, University of Benin, P.M.B. 1154, Benin City, Nigeria
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Abstract

The Jarawa Younger Granite complex is composed of high silica alkali granites that were emplaced 161 Ma ago. The granites are characterized by high contents of Rb, Li, F, Sn, Nb, W above normal low-Ca granitic rocks and have typical S-type characteristics that are indicative of a substantial component of crustal melt.

Mineralization in the complex is associated with the biotite granite which was emplaced as a sheet-like body at relatively shallow depth and occurs as disseminations and as greisen lodes and veins.

Chemical studies of the granites have shown that the biotite granite represents a highly fractionated rock that crystallized from a residual magma from which the hornblende-biotite granite had previously crystallized. However the biotite granite is characterized by steep gradients in some minor and trace elements that apparently indicate that liquid-state differentiation and/or volatile complexing processes made significant contributions to their differentiation. Enrichment of Th, Li, Rb, Sn, W and Nb may be more closely linked to roofward migration of F.

Type
Articles
Information
Geological Magazine , Volume 122 , Issue 2 , March 1985 , pp. 163 - 173
Copyright
Copyright © Cambridge University Press 1985

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