Petrogenesis, LA-ICP-MS zircon U-Pb geochronology and geodynamic implications of the Kribi metavolcanic rocks, Nyong Group, Congo craton

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

“…Opaque minerals are xenomorphic, disseminated in the rock, and occasionally included in ferromagnesian minerals. This rock has also been observed in the Nyong Complex byMvodo et al (2022) in Kribi,Owona et al (2022) in Bipindi, and Swiffa Fajong et al (2022) in the Toko-Nlokeng area, precisely the TNF08 prospect.4.3.4 | Ultramafic metavolcanic host rocksUltramafic granuliteThe ultramafic granulite (sample TE01) was collected at 17 m depth from the drill hole TNF11_01. The rock is massive, dark grey, and coarse-to medium-grained in appearance (Figure4g).…”

“…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).…”

“…Clinopyroxene is the second most abundant ferromagnesian mineral in this rock after hornblende. Clinopyroxene Owona et al, 2022), and Kribi metavolcanic rocks (Mvodo et al, 2022). Gneissic rocks and mafic-ultramafic host rocks geochemical data are given in Tables 1 and 2 respectively.…”

“…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).…”