The subcircular Djilouet body is made of five distinct granite types, displaying a concentric pattern. Most of the outcrop is occupied by a porphyritic coarse-grained biotite granite. In the center of the body is found a muscovite granite, whereas a garnet-bearing granite forms a discontinuous rim all around the pluton. At the eastern border, the garnet-bearing granite gives way to a marginal smoked quartz granite. All these facies are overprinted by numerous thin aplite dykes (5– 10 cm width) which may extend in the metasedimentary wall rocks. They display a more or less radial pattern and are mainly concentrated in the outer reaches of the pluton. NE-SW elongated stripes of a greisen are present in the southwest half of the pluton, where they overprint all the facies, including the aplites. Mineralized quartz veins (cassiterite and wolframite), with a similar orientation and greisenized borders, are distinctly separated from these greisen stripes, which they overprint.

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References