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Mineral Chemistry of Wehrlite Xenoliths Hosted in Basalts from the SW of Hossere Dammougalre(Adamawa Plateau,Cameroon):Thermobarometric Implications

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Open Journal of Geology 2017年第10期7卷 1465-1477页

作者： isaac bertrand gbambie mbowou Dagwai Nguihdama Fadimatou Ngounouno Yamgouot Mama Ntoumbe Abdel Aziz Youpoungam Ismaila Ngounouno School of Geology and Mining Engineering University of NgaoundereNgaoundereCameroon Department of Life and Earth Sciences Higher Teachers’Training CollegeUniversity of MarouaMarouaCameroun Department of Earth Sciences Faculty of ScienceUniversity of NgaoundereNgaoundereCameroon

Wehrlite samples (size: ~4 cm) hosted in basaltic lavas from the SW of Hosséré Dammougalré 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 (<90) indicate a re-equilibration of Fe-Mg in the host basalt at low temperatures. All the analyzed wehrlite clinopyroxenes have crystallized at high pressures as evidenced by the Alvi 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.

关键词： Wehrlite Adamawa Plateau Hossere Dammougalré Mineral Chemistry Geothermometry

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Spinel-Bearing Lherzolite Xenoliths from Hossere Garba(Likok,Adamawa-Cameroon):Mineral Compositions and Geothermobarometric Implications

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International Journal of Geosciences 2014年第12期5卷 1435-1444页

作者： Nguihdama Dagwai Chazot Gilles Kamgang Pierre mbowou gbambie isaac bertrand Ngounouno Ismaila Ecole Normale Supérieure Universite de MarouaMarouaCameroun Universite Europeenne de Bretagne BrestFrance Departement des sciences de la Terre Faculte de SciencesUniversite de Yaounde IYaoundeCameroun Ecole de Géologie et d’Exploitation Miniere(EGEM) Departement de Mines et de la GeologieUniversite de NgaoundereMeigangaCameroun

Spinel-bearing lherzolite xenoliths from the Hossere Garba (1272 m.a.s.l) volcano on the Adamawa Plateau, is located in Likok village, at about 35 km to WSW of Ngaoundere. These xenoliths (~11 cm size) have been sampled into the host basaltic lava flows from the NE flank of the Hossere Garba volcano. These xenoliths characterized by porphyroclastic texture consisted of olivine (~55 vol.%), orthopyroxene (~19 vol.%) and clinopyroxene (~21 vol.%) crystals. Spinel crystals (~5 vol.%) are red brown and interstitial between the crystals of olivine and pyroxenes. CaO contents are low (<0.08 wt%) in olivine and similar to those estimated (CaO: 0.05 - 0.1 wt%) for the mantle origin. The values of AlVI/AlIV ratio range between 1.1 and 1.3 for the Cr-diopside crystals from Hossere Garba xenoliths. The constant value of the volumes V(Cell) and V(M1) for clinopyroxene compositions, indicates the similar pressures. Hossere Garba represents a residual sequence issued from partial melting of a mantle source. Similar compositions have been recorded in minerals of ultramafic xenoliths from other ultramafic xenoliths domains of the Cameroon Line and the Adamawa Plateau.

关键词： Xenoliths lherzolite Geothermobarometry Likok Adamawa

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