A Typical Sublithospheric Mantle beneath the Tello Region, SE-Ngaoundéré (Cameroon Line)

Peridotite xenoliths, raised to the surface by alkaline basalts or kimberlites,provide us direct information on processes and composition of upper mantle. They are major source state stress,pressure temperature in deep thus a petrological geochemical that is generally not available Earth’s surface. Fresh spinel-lherzolite xenoliths exhibit protogranular components Tello volcano. The continental sector Cameroon Line, located South East town Ngaoundéré at 75 km approximately between (N7° 13’, N7° 14’) (E13° 40’ E13° 60’). Minerals’ ~64% olivine, ~24% orthopyroxene, ~11% clinopyroxene ~1% spinel. Significant variation (Cr/Cr + Al) system shows reciprocal nature spinel solution.The lherzolites show internal chemical homogeneity represent normal Their mineral chemistries suggest equilibrium condition 830° - 925° 1.4 GPa-2.3 GPa. These data there good correlation bracket increasing activity Al2O3 decreasing practionning TiO2 into AlIV AlVI contents vary 0.05-0.2 0.03-0.2 respectively. majority samples caracterise lithospheric