@article{jgg2020825,
author={{Ngoniri, Alexis Hamdja and Ngnotue, Timoleon and Njiosseu, Evine Laure Tanko and Kenne, Patrick Ayonta and Ganno, Sylvestre and Nzenti, Jean Paul},
title={Geochemistry of the Neoproterozoic Mbondo-Ngazi Tina Metasediments, Adamawa Area, Central Cameroon: Source Provenance and Tectonic Setting},
journal={Journal of Geosciences and Geomatics},
volume={8},
number={2},
pages={94--109},
year={2020},
url={http://pubs.sciepub.com/jgg/8/2/5},
issn={2373-6704},
abstract={The Mbondo-Ngazi Tina area belongs to the Adamawa-Yade domain within the Pan-African Central Africa Fold Belt in Cameroon (CAFB). The basement of this area is dominated by metasedimentary rocks composed of sericite schist, chlorite schist and muscovite schist. Whole-rock geochemical compositions of these rocks were investigated in order to determine their provenance and tectonic setting. The studied metasedimentary rocks have SiO<SUB>2</SUB> and Al<SUB>2</SUB>O<SUB>3</SUB> contents comparable to the average composition of the Neoproterozoic upper continental crust (UCC). These rocks are strongly depleted in CaO, MgO, and enriched in K<SUB>2</SUB>O, Ba and Rb with respect to UCC, reflecting K addition during diagenesis. The CIA, CIW, PIA and the SiO<SUB>2</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> and Th/U ratios indicated that these rocks had suffered varying degrees of weathering as the source rocks underwent mild to moderate chemical weathering. The PAAS-normalized REE patterns are almost flat with slightly LREE depletion with respect to HREE and null to weakly positive Eu anomalies. Their chondrite-normalized REE patterns are parallel to sub-parallel, LREE-enriched, and display distinct negative Eu anomalies and weakly fractionated HREE segments. Overall, they are geochemically mature and have suffered sedimentary recycling. They derived mainy from felsic to intermediate rocks with minor contamination of mafic rocks. The Mbondo-Ngazi Tina metasedimentary rocks show REE and trace element compositions similar to those of Archean sediments, suggesting that the continental crust of the study area during the early Proterozoic had chemical compositions similar to those of the Archean crust and were probably deposited in active to passive continental margin settings.},
doi={10.12691/jgg-8-2-5}
publisher={Science and Education Publishing}
}