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. 11 NO. 3 2025
DOI: 10.56201/ijgem.vol.11.no3.2025.pg49.71

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Petrology and Morphology of Migmatites Around Dogon Koli Part of Sheet 148 Toro Se Area of Bauchi State

Rugu Sunday Ntuman, Ahmed Isah Haruna, Adamu Muktar Hassan, Musa Wada, Umar S Umar, Abdulmajid Isa Jibrin, Mercy Yusuf, Abdulbari Saleh Dandashire, Idris Muhammad Sunusi

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Abstract

The study area is located within the pan African older granites and is located in Dogon Koli East of Toro LGA in Bauchi state of Nigeria and is accessible through Bauchi Jos Road. Using Sawyers classification of migmatites, the study area has various morphological units of migmatite that are mainly metatexites(banded orthogneiss and stromatic), diatexites (schlieren and nebulite), and rhyolite occurring as dyke. Petrographically, morphology suggested to have the most potential of hosting mineralization is the diatexites among other morphology, the presences of metamorphic minerals, garnet, hornblende, orthopyroxene in the rocks morphologies suggest a high metamorphic grade. The change in the morphologies is due to the change in partial melting rate. Extinction observed on quartz grains in all the slides suggest an intra-crystalline deformation and the polycrystalline nature of the quartz grains also suggest a high temperature deformation as a result of grain boundary migration. The presences of structures like Isoclinal fold, crenulation cleavages, gneisses 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+hornblend, through to the diatexites, which is indicated by the general coarsening of quartz grains size and depletion of the paleo structure. The protolith is characterized by Eburnean indicating metasedimentary paleo rocks.

keywords:

Dogon koli, Metatexites, Diatexites, Banded orthogneisses, Stromatic, Schlieren

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