%0 Journal Article %T Spinel-Bearing Lherzolite Xenoliths from Hosséré Garba (Likok, Adamawa-Cameroon): Mineral Compositions and Geothermobarometric Implications %+ École normale supérieure - Maroua (ENS Maroua) %+ Domaines Océaniques (LDO) %+ Département des Sciences de la Terre %+ Ecole de Géologie et d'Exploitation Minière [Univ Ngaoundéré] (EGEM) %A Nguihdama, Dagwai %A Chazot, Gilles %A Kamgang, Pierre %A Mbowou-Gbambié, Isaac Bertrand %A Ngounouno, Ismaïla %< avec comité de lecture %@ 2156-8359 %J International Journal of Geosciences %I Scientific Research %V 5 %P 1435 - 1444 %8 2014 %D 2014 %R 10.4236/ijg.2014.512117 %K lherzolite %K Xenoliths %K Adamawa %K Likok %K Geothermobarometry %Z Sciences of the Universe [physics]/Earth Sciences/MineralogyJournal articles %X Spinel-bearing lherzolite xenoliths from the Hosséré Garba (1272 m.a.s.l) volcano on the Adama-wa Plateau, is located in Likok village, at about 35 km to WSW of Ngaoundéré. These xenoliths (~11 cm size) have been sampled into the host basaltic lava flows from the NE flank of the Hosséré 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 Al VI /Al IV ratio range between 1.1 and 1.3 for the Cr-diopside crystals from Hosséré Garba xenoliths. The constant value of the volumes V(Cell) and V(M1) for clinopyroxene compositions, indicates the similar pressures. Hosséré Garba represents a residual sequence is-sued from partial melting of a mantle source. Similar compositions have been recorded in miner-als of ultramafic xenoliths from other ultramafic xenoliths domains of the Cameroon Line and the Adamawa Plateau. %G English %2 https://insu.hal.science/insu-01108751/document %2 https://insu.hal.science/insu-01108751/file/IJG-chazot-.pdf %L insu-01108751 %U https://insu.hal.science/insu-01108751 %~ INSU %~ UNIV-BREST %~ AFRIQ %~ CNRS %~ GIP-BE %~ RIGL %~ LGO %~ CMM %~ GEO-OCEAN