IIARD International Institute of Academic Research and Development

IIARD INTERNATIONAL JOURNAL OF GEOGRAPHY AND ENVIRONMENTAL MANAGEMENT (IJGEM )

E-ISSN 2504-8821
P-ISSN 2695-1878
VOL. 10 NO. 3 2024
DOI: https://doi.org/10.56201/ijgem.v10.no3.2024.pg345.369

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Petrography, Field Relationship and Morpholgical Classification of Migmatites Around Gada Biyu- Maiturare, Northeastern Nigeria Part of Sheet 148 Toro S.E

Adamu Mukhtar Hassan, Ahmed Isah Haruna, Abubakar Sadiq Maigari Tersoo Aga Faisal Abdullahi , Abdulmajid Isa Jibrin, Idris Ismail Kariya

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Abstract

The study area is located within the Pan African Older Granite and is located in Rimin zayam East of Toro L.G.A in Bauchi state and is accessible through Bauchi-Jos Road. Using Sawyers classification of migmatites, the study area has various morphological units of migmatites, that are mainly metatexite (Banded Orthogneisses and Stromatic), diatexite (Schlieren and Nebulitic diatexite) and rhyolites occurring as dyke. Petrographically, the presence of metamorphic mineral garnet, sillimanite, hornblende, orthopyroxene and cordierite minerals in the rock’s morphologies suggest a high metamorphic grade. The change in morphologies is due to change in partial melting rate. Extinction observed on quartz grains in all slides suggests an intra-crystalline deformation and the polycrystalline nature of the quartz grains suggest a high temperature deformation as a result of grain boundary migration. The presence of structures like the ptygmatic folds, crenulation cleavage, Gneissic foliation are all evidence of complex shearing episode has affected the study area. The grade of metamorphism increases from metatexites, which is indicated by preferred elongation of biotite and abundance of biotite + muscovite + hornblende, through to the diatexites, which is indicated by the general coarsening of quartz grain size and depletion of the paleo-structure of the schist. 160 foliation planes were measured and plotted on a rose diagram to know the trend and stereographic projection to determine the beta and s-pole of the planes which gave a NW-SE Trend.

keywords:

Gada Biyu, Metatexite, Rimin Zayam, Foliation, Stromatic, Basement Complex, Schist

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References:

Ajibade. A. C., and Wright. J. B., (1989): The Togo-Benin-Nigeria Shield: evidence of crustal
aggregation in the Pan-African belt, Tectonophysics, 165: pp. 125–129.

Baba S., Abba S.I., and Dada S.S., (2006): Preliminary Petrogenetic Study of some Rocks from
Gwoza Area, NE. Nigeria. Global Journal of Geological Sciences 4(2): pp. 147-155

Black .R , Ball .E, Bertrand .J .M, Boullier A.M, Caby R, Davison I, Fabre J, Leblanc M,
Wright L.I (1979). Outline of the Pan-African Geology of Adrar des Iforas (Republic
ofMali), Band 68, Heft 2, seite pp.543-564.

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