Petrology and Geochemistry of Loukounga Metabasites Rocks: Constraining the Geodynamic Context of Neoproterozoic Nemba Complex in the Mayombe Belt

This study focuses on the metabasite rocks of Nemba Complex Mayombe belt, an African segment Araçuaï-West Congo Orogen (A-WCO) extending from southwest Gabon to northwest Angola. These outcrops are in southwestern along Loukounga river. The complex is Neoproterozoic age and represents lower part west congolian Supergroup. objective this constrain geodynamic context petrology geochemistry metabasites sampled River. observed composed amphibolites, metagabbros, epidotites greenschists affected by folding accompanied flux schistosity crenulation schistosity. Geochemical analyzes show that have a basic ultrabasic chemical composition with SiO2 contents between 41.85% 58.23%. geochemical major traces elements shows basalts, basaltic andesites andesites. magma enrichment LREE, LILE depletion HREE HFSE. multielement spectra negative anomalies Nb-Ta, Ti relatively low Nb/La ratio which characterize lithospheric source contaminated continental crust. Traces discrimination plots emplaced intraplate like associated basalts trap-types shelves possibly derived mantle plumes contemporaneous or slightly prior magmatism.