Journal Name:
- International Journal of Innovation and Applied Studies
Key Words:
| Author Name | University of Author |
|---|---|
Abstract (2. Language):
The petrographic study of rocks and some few outcrops revealed the great diversity of volcano-plutonic
formations. Indeed, magmatism of the Yaouré Mountains is quite differentiated, ranging from basic terms (basalts) to acidic
terms (rhyolites), passing to neutral terms (rhyodacites, andesites and dacites). The study also identifies several varieties of
plutonic igneous rocks, including diorites, granodiorites, gabbros and sub-volcanic (microgranites). Diorites and granodiorites
are dykes or sills in the N150° and N60° directions.
The structural study made in the trenches and the pits, and on the few outcrops has highlighted several directions of
fractures. The most common are: N-S to N20°, subvertical N60°, N90°-65°N, N150°-35°SW and N120°-25° NE. Genetic analysis
made between the gold mineralization, the geological facies and the deformations shows that the mineralization is postimplementation
of volcanic rocks (rhyodacites, dacites, andesites and basalts) and subvolcanic rocks (microgranites) with
sulfides, and anterior to undeformed plutonic gabbroic rocks. The mineralization is hydrothermal and structural type,
synchronous to conjugated fractures with dextral N150° and sinistral N060° directions. The host rocks of the gold
mineralization are volcanic and sub-volcanic rocks. This mineralization occurs as stockworks and quartz veins.
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