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Geologic settings and petrographic analysis of uding granitic hills and environs part of Hawal Massif North Eastern Nigeria

Author Affiliations

  • 1Department of Geology, Modibbo Adama University of Technology, Yola. Adamawa State, Nigeria
  • 2Department of Geology, Modibbo Adama University of Technology, Yola. Adamawa State, Nigeria

Int. Res. J. Earth Sci., Volume 5, Issue (6), Pages 1-7, July,25 (2017)

Abstract

The Uding granites are situated in the Hong area of Adamawa state, where the Hawal massif clearly defined the geologic unit. Hawal massif is the name given to the basement complex rocks of Northeastern Nigeria. The granite is underlain by 300-400m of intensely metamorphosed rocks of the earlier Precambrian – the migmatite-gneiss. Field mapping was carried out on a scale of 1:25,000, traversing the area was challenging due to the natural stationing of smooth surfaced hills of batholithic granite. Field observation shows that the hills are mainly coarse-grained massive granitic batholith, with no observable evidence of metamorphism. Opened cracks and joints have also been observed, with no sealing. Evidence of high-grade metamorphism as schistocity and bandings were conspicuously absent. Elsewhere at the lowermost parts of some hills, particularly the Northwestern part of the study area near Pella, fabrics of metamorphic facie were encountered, signifying onset of metamorphism. There, the porphyritic texture of the granite hills were deformed and obliterated. Mineral assemblages obtained from petrographic studies confirm the rocks to be chiefly biotite-granite with accessory minerals as muscovite, zircon and hornblende. Exclusively metamorphic minerals have not been observed in the thin section studied both under plane polarized and cross-polarized lights. Both field and mineralogical evidences obtained in this study indicated that the Udinggranitic hills have not been transformed, hence remained as differentiated part of the basement complex of northeastern Nigeria, the Hawal massif.

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