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Geology and Petrography of Schlieren cum Nebulites from Bauchi, Northeastern Nigeria

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Author Affiliations

  • 1Department of Applied Geology, Abubakar Tafawa Balewa University Bauchi, Nigeria
  • 2Department of Applied Geology, Abubakar Tafawa Balewa University Bauchi, Nigeria
  • 3Department of Geology, University of Jos, Nigeria

Int. Res. J. Earth Sci., Volume 9, Issue (1), Pages 1-16, February,25 (2021)

Abstract

Bauchi area is part of sheet 149NE which falls within the Northern Basement Complex of Nigeria. In this study, the area was mapped on a scale of 1:25,000. Samples were collected at the flanks of the outcrops, railway cuts, road cuts as well as blasting sites within the area. At each sampling point, two or more samples were collected based on morphological variations. The first and second order morphological classifications of migmatites as being metatexite or diatexite such as banded orthogneiss, stromatic, schlieren or nebulite were used as the guiding principle. This technique was repeated for the rest of the sampling points in the area covering about fifteen (15) different locations. A total of 10 representative samples were studied petrographically. Together with the field mapping and morphological features, it was observed that the area has five different lithologic units, viz: metasediment (quartzite), schlieren (melanocraticdiatexite), nebulites(Bauchite, quartz-diorite and granulitic granite) in a sequence ofprograde metamorphism where CO2 (graphite) aids in supplying the temperature needed for the exceptional coarse grains features of the nebulites yet through rapid cooling.

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