Petrogenesis and U–Pb zircon dating of amphibolite in the Mewengo iron deposit, Nyong series, Cameroon: fingerprints of iron depositional geotectonic setting

Petrology and geochemistry of metamorphosed rocks associated with iron formations of the Toko‐Nlokeng iron deposit, (Southern Cameroon): Implications for geodynamic evolution and mineralization

“…This trench and the migmatization of TTG are likewise contemporaneous and is in good agreement with earlier investigations (Bouyo Houketchang et al, 2019;Kwamou et al, 2021;Loose & Schenk, 2018). This age also coincides with the times that BIFs, amphibolites, and metasedimentary rocks were formed (Djoukouo et al, 2021;Kamguia Woguia et al, 2022;Kwamou et al, 2021;Owona et al, 2021;Soh et al, 2021) Nyong Complex, are evidence of the earliest modern-style plate tectonic activity as described by Chaves and Porcher (2020). They also belong to the regional Transmazonian/Eburnean orogenic event.…”

“…Total carbon and sulphur were determined by the Leco method (TC003). To assess the geodynamic evolution history and mineralization of the Toko‐Nlokeng iron deposit and the Nyong Complex as a whole and to verify the relevance of previous results, they were plotted in the different discrimination diagrams sets of data: nine (03 samples of Grt‐px gneisses and 03 samples of mafic granulites) from Moudioh et al (2020), eight samples of garnet amphibolites from Kwamou et al (2021), nine granitic gneiss samples from Kouankap Nono et al (2022), 17 samples (07 mafic granulites, 05 garnet‐amphibole gneiss, and 05 garnet‐amphibole gneiss) from Mvodo et al (2022), four samples of metabasites from Owona et al (2022), and 19 samples (8 mafic granulites, and 11 garnet amphibolites) from Swiffa Fajong et al (2022), and 19 samples (8 mafic granulites, and 11 garnet amphibolites) from Owona et al (2022). These data are presented in Tables 1–4.…”

“…Many tectonic discrimination diagrams based on immobile components are used to limit the geodynamic setting of metamorphosed mafic rocks (El-Shazly et al, 2019;Pearce, 2008). Similar to the Mewengo and Kribi garnet amphibolite presented for comparison, the studied garnet amphibolites and mafic granulites display back-arc and E-MORB (Bouyo Houketchang et al, 2019;Kwamou et al, 2021;Loose & Schenk, 2018;Moudioh et al, 2020;Mvodo et al, 2022;Owona et al, 2022;Swiffa Fajong et al, 2022) The protolith of the granitic gneisses associated with the iron formation in the Mewengo granitic gneisses was emplaced at approximately 2837 ± 100 Ma (Kouankap Nono et al, 2022), and the Kribi garnet amphibolites were emplaced at approximately 2671 ± 51 Ma (Neoarchean) and metamorphosed at approximately 2065 ± 55 Ma (Mvodo et al, 2022). (Shang et al, 2004).…”

“…This is based on field observations in conjunction with petrographic and geochemical examinations. Numerous reports of similar processes throughout the entire Nyong Complex (Kwamou et al, 2021;Lerouge et al, 2006;Moudioh et al, 2020;Mvodo et al, 2022;Nga Essomba et al, 2020;Nzepang Tankwa et al, 2021;Owona et al, 2022). In this context, before making any petrogenetic and geodynamic interpretations, it is important to evaluate the effects of post-emplacement processes on the mobility of major, trace, and rare earth elements.…”

“…On the other hand, there is no detailed data linking mafic‐ultramafic rocks and Algoma‐type mineralization to petrogenesis and geodynamic evolution in the Congo Craton. Most previous works concentrated on metavolcanic formations (Bouyo Houketchang et al, 2019; Kwamou et al, 2021; Loose & Schenk, 2018; Mvodo et al, 2022; Owona et al, 2022; Swiffa Fajong et al, 2022). This has shown that mafic‐ultramafic metavolcanic rocks estimated mid‐ocean ridge basalts (MORB) affinities where eclogites were linked to IAB‐, E‐MORB‐, N‐MORB‐protolith magma types, and extremely OIB‐compositional types with slight crustal contamination in the Nyong Complex (Bouyo Houketchang et al, 2019; Loose & Schenk, 2018; Owona et al, 2022; Swiffa Fajong et al, 2022).…”