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Wehrlite samples (size: ~4 cm) hosted in basaltic lavas from the SW of Hossere Dammougalre are located in the western Adamawa Plateau. Porphyritic and allotriomorphic texture characterize respectively host Basalt and wehrlite xenoliths. The phenocrysts of olivine (Fo68−74), and Ti-magnetite are scattered in host basalt. Wehrlite xenoliths (~4 cm size) contain Cr-rich clinopyroxene (diopise-augite), olivine (Fo76−88) and chromiferous spinel. Equilibrium temperatures calculated from Fe/Mg exchange reaction for olivine/spinel vary between 944°C and 1102°C. The wehrlite olivine crystals with low Fo (vi and Aliv contents. The studied spinel-bearing wehrlite xenoliths represent probably the residual portions of the upper mantle, which are an important source of information about lithospheric composition and thermal evolution beneath the Adamawa Plateau.

open journal of geology

Mineral Chemistry of Wehrlite Xenoliths Hosted in Basalts from the SW of Hoss&amp;#233;r&amp;#233; Dammougalr&amp;#233; (Adamawa Plateau, Cameroon): Thermobarometric Implications