Volume 4, Issue 6, December 2015, Page: 266-274
Petrographic and Geochemical Characterization of Basalts in Bangangte Area (West Cameroon): Implications on Their Source
Pierre Wotchoko, Department of Geology, Higher Teacher Training College, University of Bamenda, Bambili, Bamenda, Cameroon
Joëlle Flore Tene Djoukam, Department of Earth Sciences, Faculty of Sciences, University of Yaoundé 1, Yaoundé, Cameroon
Gus Djibril Kouankap Nono, Department of Geology, Higher Teacher Training College, University of Bamenda, Bambili, Bamenda, Cameroon
Patrice Arnaud Kouske, Institute of Technology, University of Douala, Douala, Cameroon
David Guymollaire Nkouathio, Department of Earth Sciences, Faculty of Sciences, University of Dschang, Dschang, Cameroon
Solange Atenkia Fonkem, Department of Geology, Higher Teacher Training College, University of Bamenda, Bambili, Bamenda, Cameroon
Received: Oct. 25, 2015;       Accepted: Nov. 6, 2015;       Published: Dec. 7, 2015
DOI: 10.11648/      View  5572      Downloads  190
The Bangangte area belongs to the Cameroon Volcanic Line. The volcanic rocks exposure in the area consist of fine microlitic porphiritic Basalts which still poorly surveyed. Petrographically, the studied rocks are made up of minerals like plagioclase, clinopyroxene, olivine phenocrysts and a lot of opaque minerals within a very fine grained matrice. The Bangangte basalts are quartz normative free and are olivine, Diopside, Hypersthene normative. Alkaline (Na2O + K2O) contents vary from 2.247% to 5.46%. These rocks are low-Mg basalts with the Mg# values vary from 42.86 to 45.95 which are characteristic of primitive mantle source. The studied rocks are alkali to transitional basalts with Nb/Y ratio>1.5. Chondrite normalized spider diagram pattern of REE shows uniform patterns with enrichment in LREE and a relative depletion in HREE. While MORB normalized spider diagram pattern of multi elements reveals a negative anomaly with K2O, with enrichement in LILE and depletion in HREE. The Eu anomalies are positive to nulle and are typical of alkali basalts. The Bangangté transitional alkali basalts were formed in intraplate setting of continental part of the CVL. They are the products of partial melting of about 13% of an asthenosphere made up of garnet peridotite. Geochemically, the studied basalts are similar to alkali basalts from Mount Bamenda.
Bangangte, CVL, Alkali to Transitional Basalts, Asthenosphere, Garnet Peridotite
To cite this article
Pierre Wotchoko, Joëlle Flore Tene Djoukam, Gus Djibril Kouankap Nono, Patrice Arnaud Kouske, David Guymollaire Nkouathio, Solange Atenkia Fonkem, Petrographic and Geochemical Characterization of Basalts in Bangangte Area (West Cameroon): Implications on Their Source, Earth Sciences. Vol. 4, No. 6, 2015, pp. 266-274. doi: 10.11648/
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