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Most copper-zinc volcanogenic massive sulfide deposits (herein designated by their common acronym, “VMSD”) in the Quebec segment of the Abitibi belt occur in volcanic complexes characterized by tholeiitic to calc-alkaline, mafic and felsic volcanic rocks, associated sediments and related igneous intrusives. These complexes were constructed upon extensive submarine plains composed of tholeiitic to komatiitic, mafic to ultramafic lava and intrusives. The volcanic complexes are generally comprised of multiple cycles which may be bimodal (ex., andesiterhyolite) or continuous (ex., andesite-dacite-rhyodacite-rhyolite). Essential elements of these volcanic successions are subaqueous felsic domes and associated volcaniclastic rock, massive sulfide deposits, and chemical sedimentary...

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