Mineralogy and Magmatic Processes of Cenozoic Intraplate Alkaline Volcanic Rocks of Bafang and Its Environs (cameroon Volcanic Line, West Africa)

Alkaline basalts of Bafang and its environs are consisted of feldspars, olivines, pyroxenes and oxides which appear as phenocrysts, microphenocrysts and microcrysts.Feldspars are plagioclases Or 20.59-1.51 ) and anorthoclases ).Plagioclases are the most abundant amount these feldspars.Anorthoclases appear only in mugearite (BAF 3 and BAF 37) the most differentiated of the studied alkaline-basalts.In High Magnesian basalt, (HMg-B) plagioclases are labradorites (An 67.97-59.30Ab 38.74-30.43Or 2.75-1.60 ) and sanidine (An 45.44-31.82Ab 62.66-51.79Or 5.52-2.77), whereas in Low Magnesian basalt (LMg-B) there are labrador (An 67.4.75-51.96Ab 44.98-33.72Or 3.06-1.51), andesine (An 45.44-31.82Ab 62.66-51.79Or 5.52-2.77), oligoclase (An 26.65-15.84Ab 69.19-63.57Or 20.59-8.55 ) and anarthoclase (Ab 68.11-61.20Or 33.87-20.91An 10.98-4.93 ).Olivines are magnesian (Fo 86.7-50.1 ) and ferriferous (Fo 48.8-37.8 ).In HMg-B, olivine are only magnesian.These olivines are chrysolites and hyalositerite.In LMg-B, olivines are magnesian and ferriferous with the predominance of ferriferous.They are chrysolites, hyalositerite and hortonolite.Pyroxenes are Ca, Mg and Fe clinopyroxenes.There are diopsides (Wo 51.94-45.02En 44.41-33.16Fs 16.42-10.70) and augites (Wo 44.88-43.64En 41.03-37.04Fs 18.25-14.43).Oxides are magnetites represented by ulvos-