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An initial investigation of the geochemistry of the igneous intrusions which commonly occur spatially associated with lode gold deposits in the southwest part of the Abitibi subprovince shows four main types of intrusion with distinctive geochemical compositions: (1) synvolcanic quartz diorites to tonalites showing characteristics of recent island-arc calc-alkaline suites, (2) feldspar ± quartz porphyries similar in general to tonalite-trondhjemite suites external to the greenstone belts, (3) small plugs of monzodiorite to granodiorite composition which most closely resemble the geochemistry of modern high K calc-alkaline intrusions, and (4) calc-alkaline (shoshonitic) lamprophyre-diorite dikes. Only group 3 shows anomalous primary Au...

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