Geology, Geochemistry and Petrogenesis of Granite Suites and Pegmatites in the Northern Part of Mandara Hills Gwoza Sheet 114, Northeastern Nigeria

Description

– Geology, Geochemistry and Petrogenesis of Granite Suites and Pegmatites in the Northern Part of Mandara Hills Gwoza Sheet 114, Northeastern Nigeria –

Download Geology, Geochemistry and Petrogenesis of Granite Suites and Pegmatites in the Northern Part of Mandara Hills Gwoza Sheet 114, Northeastern Nigeria. Students who are writing their projects can get this material to aid their research work.

Abstract

This research work focused on the petrological and geochemical characteristics of the granites and pegmatites in the northern part of Mandara Hills part of sheet 114 (Gwoza), so as to constrain their evolutionary history and to determine their mineralization potential, based on new sets of petrological and geochemical data.

The area is underlain by low-lying migmatite gneiss, amphibolites, granite suites, aplite and pegmatites.

The granite suites vary in texture and composition and comprise of diorite, medium-grained biotite hornblende granite, porphyritic biotite granite, coarse-grained biotite granite, medium-grained biotite granite, fine-grained biotite granite and tectonised granite (cataclasite).

Two types of pegmatites have been mapped in the area. Type-I pegmatite occurs as large oval-shaped bodies trending in E-W directions, and type-II occurs mainly as veins often cross-cutting their host rocks and strike mainly in the NE-SW direction.

Introduction

1.1 Background of the Study

The study area lies in the northern part of the N-S trending Mandara Hills, northeastern Nigeria. The area is considered as the northern extension of the Obudu-Oban Massifs in southeastern Nigeria separated only by the Benue Trough (Abaa and Najime, 2006).

The area is underlain by migmatitic gneiss, amphibolites, granite suites, aplite and pegmatites. The granites which are in most places intruded by pegmatites constitute about sixty percent (60 %) of the total crystalline basement rocks in the area.

Granites are deep-seated igneous rocks composed of quartz, mica, feldspars and ferromagnesian minerals such as amphibole or pyroxene, in grains sufficiently large to be distinguished by the naked eye and possessing a texture produced by the crystals as a whole interfering with one another’s free development (Read, 1948).

Granite sensu stricto is rich in potassium feldspar (up to 65% of feldspars) relative to plagioclase and has a high content of quartz (20-60%).

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