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Geochemical Characterization of Boula Ibi Granitoids and Implications in Geodynamic Evolution

Author

Listed:
  • Jean Paul Sep Nlomngan
  • Joseph Penaye
  • Rigobert Tchameni
  • Sebastien Owona
  • Augustin Patrice Moussango Ibohn
  • Emmanuel N. Nsifa
  • Toteu Sadrack Félix

Abstract

Petrographical and geochemical study, consistent with observed field relations show that the Boula Ibi syn- and post-kinematic granitoids in north Cameroon, occurred in banded gneisses. These syn- and post-kinematic granitoids consist of deformed monzonites typified by its granoblastic texture, diorites, syenites, granites and basic xenoliths of dioritic and monzonitic composition. They are calc-alkaline, hyperpotassic, metaluminous to slightly peraluminous and I-Type granitoids. They display high content in Fe2O3 + MgO + CaO (2.16 – 23.24 %) that reveals their intermediate affinity, magnesian and metaluminous character whilst the low A/CNK (< 1.1) content indicates their mantle origin. Harker diagrams and La/Sm vs La define the fractional crystallization and partial melting as the two main processes that led the geodynamic evolution of the Boula Ibi syn- and post-kinematic granitoids. These are consistent with low-content of Cs, Ta, Nb, Tb and Hf, supporting high melting rates ranging between 20 and 40% as well as molar Al2O3/(MgO + FeOt) vs CaO/(MgO + FeOt) plot showing magmatic evolutions from metabasaltic and metagreywackes sources.

Suggested Citation

  • Jean Paul Sep Nlomngan & Joseph Penaye & Rigobert Tchameni & Sebastien Owona & Augustin Patrice Moussango Ibohn & Emmanuel N. Nsifa & Toteu Sadrack Félix, 2022. "Geochemical Characterization of Boula Ibi Granitoids and Implications in Geodynamic Evolution," Journal of Geography and Geology, Canadian Center of Science and Education, vol. 11(4), pages 1-13, December.
    • Handle: RePEc:ibn:jggjnl:v:11:y:2022:i:4:p:13
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    JEL classification:

    • R00 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - General - - - General
    • Z0 - Other Special Topics - - General

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