%0 Journal Article
%T Mineral Chemistry of Wehrlite Xenoliths Hosted in Basalts from the SW of Hosséré Dammougalré (Adamawa Plateau, Cameroon): Thermobarometric Implications
%A Isaac Bertrand Gbambi¨¦ Mbowou
%A Dagwa£¿ Nguihdama
%A Fadimatou Ngounouno Yamgouot
%A Mama Ntoumbe
%A Abdel Aziz Youpoungam
%A Isma£¿la Ngounouno
%J Open Journal of Geology
%P 1465-1477
%@ 2161-7589
%D 2017
%I Scientific Research Publishing
%R 10.4236/ojg.2017.710098
%X Wehrlite
samples (size: ~4 cm) hosted in basaltic lavas from the SW of Hoss¨¦r¨¦ Dammougalr¨¦ are
located in the western Adamawa Plateau. Porphyritic
and allotriomorphic texture characterize<i> </i>respectively
host Basalt and wehrlite xenoliths. The phenocrysts of olivine (Fo<sub>68<span style=\"white-space:nowrap;\">&amp;minus;</span>74</sub>),
and Ti-magnetite are scattered in host basalt. Wehrlite xenoliths (~4 cm size)
contain Cr-rich clinopyroxene (diopise-augite), olivine (Fo<sub>76<span style=\"white-space:nowrap;\">&amp;minus;</span>88</sub>)
and chromiferous spinel. Equilibrium temperatures calculated from Fe/Mg
exchange reaction for olivine/spinel vary between 944<span style=\"white-space:nowrap;\">&amp;#176;</span>C and 1102<span style=\"white-space:nowrap;\">&amp;#176;</span>C. The
wehrlite olivine crystals with low Fo (&lt;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 Al<sup>vi</sup> and Al<sup>iv</sup> 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.
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%K Wehrlite
%K Adamawa Plateau
%K Hoss&#233
%K r&#233
%K Dammougalr&#233
%K Mineral Chemistry
%K Geothermometry
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=79634