Petrography and Geochemistry of Precambrian Basement Straddling the Cameroon-Chad Border: The Touboro Baïbokoum Area

The border of Cameroon and Chad is characterized by a Precambrian

basement straddling the Touboro-BaIbokoum area; this basement is made up of

gneiss, amphibolite and granitoids (granite, syenite, granodiorite). The

studied rocks display high-K calk-alcalcaline to shoshonitic characteristic.

Granitoids are metaluminous. Rocks under study derived from partial melts from

metabasaltic to metatonalitic sources, and partial melts from metagreywackes. They

shear the same origin as many granitoids describe westward in the Meiganga area

and west Cameroon. This shows that the basement straddling the Touboro-BaIbokoum

area belongs to the Adamawa-Yade Domain of the Central African Fold Belt.