Marcelle Nathalie Abomo Olomo

University of Ngaoundéré

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Zakari Nchouwet

Université de Yaoundé I

Chimene Grace Staelle Atsalang

Université de Yaoundé I

Benjamin Ntiéche

Université de Yaoundé I

Mahomed Aziz Mounjouohou

University of Maroua

Rose Yongue Fouateu

Université de Yaoundé I

Amidou Moundi

Université de Yaoundé I

Ntoumbé Mama

University of Ngaoundéré

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Université de Yaoundé I

École Normale Supérieure

National Geophysical Research Institute

University of Maroua

Institut de Recherches Géologiques et Minières

University of Ngaoundéré

Abdou Moumouni University

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Petrogenesis and tectonic setting of the mafic rocks from the Mfengou-Manki area, Central Cameroon Shear Zone: constraints from petrology and bulk-rock geochemistry

Deleted Journal (2024)

Zakari Nchouwet Benjamin Ntiéche Rose Yongue Fouateu Ntoumbé Mama Mahomed Aziz Mounjouohou

Abstract In the Central Cameroon Shear Zone, several studies were focused on granitoids and very few on mafic rocks. Here we report the petrography, geochemistry and mineralogy of the Mfengou-Manki mafic rocks in order to constrain their petrogenesis and tectonic settings and the role of lithospheric and asthenospheric mantle sources in their genesis. The studied mafic rocks are subdivided into columnar jointed basalts and mafic dykes. Clinopyroxene thermobarometry indicates that the mafic dykes crystallized at a temperature of 1071 to 1193 °C and a pressure of 4 to 12 kbar while the columnar jointed basalts emplaced at a temperature of 1064 to 1152 °C and 2 to 13 kbar pressure. The mafic dykes and columnar jointed basalts present high La/Sm, Sm/Yb, Nb/Yb and Th/Yb ratios, indicating garnet to spinel transition zone mantle source. The multi-element diagram of the mafic dykes display enrichment in Nb, Ta, Pb and Ti and depletion in Th, U, Ce and Zr compared to that of the columnar jointed basalts (slight depletion in Nb and Ta and pronounced depletion in U, Pb and Zr and enrichment in Cs, Ba and Rb) indicating the little involvement of the sub-continental lithospheric mantle to the formation of the columnar jointed basalts. The Nb/La ratio > 1 for the mafic dykes and < 1 for the columnar jointed basalts also suggest the derivation of the mafic dykes from the asthenospheric mantle and the columnar jointed basalts from the mixed lithospheric-asthenospheric mantle due to the sub-continental lithospheric mantle delamination under the Central Cameroon Shear Zone.

Petrogenesis

10.1007/s42452-024-05635-5

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