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Beno?t Joseph Mbassa Emmanuel Njonfang Mathieu Benoit Pierre Kamgang Michel Grégoire Stephanie Duchene Pierre Brunet Bekoa Ateba Félix M. Tchoua 《Mineralogy and Petrology》2012,106(3-4):217-242
The Mbengwi recent magmatic formations consist of volcanics and syenites belonging to the same magmatic episode. Lavas form a bimodal basanite-rhyolite alkaline series with a gap between 50 and 62?wt.% SiO2. Mafic lavas (basanite-hawaiite) are sodic while felsic rocks (trachyte-rhyolite-syenites) are sodi-potassic, slightly metaluminous to peralkaline. The geochemical and isotopic characteristics (0.7031?<?(87Sr/86Sr)initial?<?0.7043; 1.03?<?εNdi?<?5.17) of these rocks are similar to those of other rocks from the CVL. The main differentiation process is fractional crystallization with two trends of fractionation. Their Rb/Sr isochron age of 28.2?Ma, almost similar to 27.40?±?0.6?Ma?K/Ar age obtained in a trachyte from neighboring Bamenda Mountains system, precludes any local age migration of an hypothetic hotspot. Mafic lavas have OIB features displaying an isotopic signature similar to that of HIMU mantle source different from FOZO known as source of most parental magmas along the CVL. 相似文献
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Yannah Mero Fodoué Yaya Kwékam Maurice Mbassa Benoit Joseph Tifang Juliana Amboh Kagou Armand Dongmo Ayonghe Samuel Ndonwi 《中国地球化学学报》2022,41(5):861-886
Acta Geochimica - Somie-Ntem area of the Tikar plain belongs to the western Cameroon Domain. The lithology of the plain has been characterized, and the mineral potential is still unclear despite... 相似文献
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Ngwa Caroline N. Shu Bless N. Mbassa Benoît J. Aka Festus T. Wokwenmendam Pauline N. 《Mineralogy and Petrology》2020,114(1):57-70
Mineralogy and Petrology - We report olivine chemistry in basaltic rocks from the Mt. Cameroon Volcanic area, which is used as a proxy to understand mantle and early igneous processes along the... 相似文献
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