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Tectonics and LA-ICP-MS U–Pb zircon geochronology of the Boula Ibi Region (Northern Cameroon Pan-African Orogenic Belt)

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Abstract

The Boula Ibi Region basement in northern Cameroon consists of paragneisses alternating with amphibolites. They are intruded by pre- to post-tectonic granitoids differentiated into meta-diorites concordant with metasediments, meta-monzonites, monzodiorites, syenites, granites as well as felsic to mafic dykes, calcite and quartz-feldspar veins. The region is affected by a polyphase ductile D1–D2 deformation consisting of: D1 lateral flow regime that totally transposed the S0 bedding into the S0/1 foliation in paragneiss and amphibolites; D2 pure shear dominant transpression phase overprinting S0/1 into a subvertical S0/1/2 in meta-sediments and causing a S2 steep foliation in meta-diorites and meta-monzonites, a L2 lineation, B2 boudins F2 folds, and C/S structures. The sinistral and dextral nature of dykes, veins and fractures indicate a variety of the brittle tectonic phase. LA-ICP-MS U–Pb zircon data show that Pan-African deformation duration is >680 Ma and >580 Ma. This duration of the Pan-African orogeny in Northern Cameroon Domain is ~145 Ma which is similar to 150 Ma obtained in the Yaoundé Group (Southern Cameroon Domain).

Graphical abstract

Tectonics and LA-ICP-MS U–Pb zircon geochronology of the Boula Ibi Region (Northern Cameroon Pan-African Orogenic Belt). a South America–Africa fit, showing shields of western Gondwana (modified after Neves et al. 2006) with CS, Congo Shield; KS, Kalahari Shield; SFS, São Francisco Shield; LSS, Luis São Shield; TS, Tanzania Shield; WAS, West African Shield.b The chronostructural Pan-African ductile to post-Pan-African magmatism/Brittle deformation. c Conceptualises the D1 lateral flow regime active between ~725–~680 Ma, D2 transpression tectonics between ~680–~600 Ma and late Pan-African magmatisms/brittle deformation <580 Ma respectively. d Variety of the post-Pan-African magmatism/brittle deformation

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Acknowledgements

Authors acknowledge the Editor, Abdullah M. Al-Amri and Olivier Vanderhaeghe for the reviews and Dr Germain Marie Monespérance Mboudou and Dr Joseph Martial Akame for their comments.

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Authors and Affiliations

  1. Institute of Geological and Mining Research, Geological and Mining Research Centre, P.O Box 333, Garoua, Cameroon

    Jean paul Sep Nlomngan, Joseph Pénaye & Patrice Augustin Moussango Ibohn

  2. University of Yaoundé I, Faculty of Sciences, P.O Box 812, Yaoundé, Cameroon

    Jean paul Sep Nlomngan, Patrice Augustin Moussango Ibohn & Emanuel Nsifa Nkonguin

  3. University of Douala, Faculty of Sciences, P.O Box 24157, Douala, Cameroon

    Sébastien Owona

  4. University of N’gaoundéré, Faculty of Sciences, P.O Box 454, N’gaoundéré, Cameroon

    Rigobert Tchameni

  5. UNESCO, Regional Office for Eastern Africa, PO Box 30592, Nairobi, Kenya

    Félix Toteu Sadrack

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Sep Nlomngan, J., Owona, S., Pénaye, J. et al. Tectonics and LA-ICP-MS U–Pb zircon geochronology of the Boula Ibi Region (Northern Cameroon Pan-African Orogenic Belt). Arab J Geosci 14, 1643 (2021). https://doi.org/10.1007/s12517-021-07543-z

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