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Journal of Geosciences and Geomatics. 2014, 2(2), 62-75
DOI: 10.12691/JGG-2-2-4
Original Research

Origin and Evolution of the Formation of the Nyong Series in the Western Border of the Craton

Ndema Mbongue J. L.1, 2, Ngnotue T.3, Ngo Nlend C. D.4, Nzenti J. P.1, and Cheo Suh E.2

1Laboratory of Petrology and Structural Geology, University of Yaoundé I, P.O. Box 3412, Cameroon

2Department of Geology, University of Buea, South West Region, P.O. Box 63 Buea, Cameroon

3Department of Geology, University of Dschang, West Region, P.O. Box. 67 Dschang, Cameroon

4Institute of Mineralogy and Geochemistry, University of Lausanne, Switzerland

Pub. Date: April 27, 2014
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Ndema Mbongue J. L., Ngnotue T., Ngo Nlend C. D., Nzenti J. P. and Cheo Suh E.. Origin and Evolution of the Formation of the Nyong Series in the Western Border of the Craton. Journal of Geosciences and Geomatics. 2014; 2(2):62-75. doi: 10.12691/JGG-2-2-4

Abstract

The Nyong series at Edéa and Eseka area is located in the western edge of the Congo Craton and comprise three distinguish rock units namely: metasedimentary rocks unit (schists, garnet-rich micaschist); meta-igneous rocks unit (pyroxene-rich gneiss, garnet-rich charnockitic gneiss, charnockitic gneiss, biotite-rich gneiss, amphibole and biotite-rich gneiss, garnet and amphibole-rich gneiss, amphibolite, pyribolite, pyrigarnite, garnet-rich amphibolite) and a unit of the rocks resulting from the melt (migmatite, TTG) displaying quartzo-feldspathic segregation arising from either in situ partial melting or injection along dykes or ductile shear zones. The meta-igneous rocks derived from (i) intermediate to basic tholeiitic rocks with high TiO2 (0.6-3.47%) contents compatible with the extensive orogenic domain and (ii) calc-alkaline protolith display high FeO*/MgO (1.5-3.31) ratios which is in accordance with the typical domain of collisional orogeny. The chemical patterns of metasedimentary rocks are those of shale. The average Nb/Y (0.004) ratio and the fractioned REE patterns suggest that the contribution of alkaline vulcanite and a continental environment can be envisaged for these metasedimentary rocks.

Keywords

nyong series, extensive orogenic domain, domain of collisional orogeny, shale, continental environment

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