Pétrographie des Roches Encaissantes du Gisement Cuprifère de Louvem

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Abstract
The Louvem copper deposit, discovered by SOQUEM in 1968, is situated in the Precambrian volcanic belt that stretches between the mining districts of Noranda and Val d'Or. The ore deposit is in the upper part of the volcanic pile, near the base of the overlying silicic pyroclastic rocks, and it is conformable with surrounding rocks. Its host rocks are meta-rhyodacite and meta-dacite flows and silicic pyroclastic rocks including tuff, agglomerate, and breccia. The principal structural features are a well-developed shear zone along the original footwall of the deposit and a locally-developed, complexly folded zone that perhaps represents a zone of slumping along the original roof of the deposit. The rocks surrounding the deposit contain mineral assemblages characteristic of the greenschist metamorphic facies. Wall-rock alteration surrounding the deposit includes pyritization, chloritization, sericitization, and silicification. Pyrite and chlorite alteration is characteristic of rocks immediately surrounding the ore while sericite and secondary quartz are present in an outer alteration zone further from the deposit. Ore deposition took place in a zone of permeable pyroclastic rocks sandwiched between two massive bands of volcanic rocks.

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