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This paper presents petrographic and geochemical data on magmatic rocks of the north-western Melfi massif (part of the Gera Massif at the center of Chad) in the Adamawa-Yadé domain. The study area consists of syenite and granite, all crosscut by minor dykes and quartz veins. Syenite and granite show porphyritic texture and are dominated by K-feldsp...
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Context 1
... samples of the different rocks studied here have been collected at the north-western Melfi region in Chad (Fig. 2). For the petrographic study, thin sections were done at the thin section laboratory, Department of earth science, University of Yaoundé I (Cameroon). These thin sections have been described at the Cartography Geochemistry and Metallogeny Laboratory, Department of Earth Sciences, University of Ngaoundéré (Cameroon). Whole-rock ...
Context 2
... (B01, B04, MG4, GERF, CG1) were identified in the vicinity of Gogmi, Boudia, Mogol, and Gerfen (Fig. 2). They crop out as subcircular plutons, characterized by medium altitudes ranging between 480 and 680 m. In Gogmi area, rock is crosscut by quartz veins with metric length and variable thickness (1 to 10 cm). In all the localities mentioned above, the rock is pink to grey, has massive structure, and is fine-to-coarse grained. At the ...
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