METALLOGENESIS OF THE COPPER-MOLYBDENUM DEPOSITS RELATED TO HYPABYSSAL INTRUSIVE AND VOLCANIC-SUBVOLCANIC ROCKS IN DAXINGANLING REGION

The copper-molybdenum deposits in Daxinganling region are related to the Paleozoic and Mesozoic hypabyssal intrusive and volcanic-subvolcanic rocks. Those deposits were formed in the epicontinental magmatic zones, orogenic belts and deep-fracture zones, during Caledonian, Variscan and Yanshanian epochs. The wall rocks consist of granodiorite, granodioritic porphyrite, adamellite, andesite, dacite, rhyolite, andesitic porphyrite, rhyolitic porphyry and pyroclastic rocks, with alterations of silicification, sericitization, K-feldspathization, hydromicazation, illitization, chloritization and carbonation. The main industrial elements in the ore are Cu and Mo, associated with Ag, Au, Re etc. The metallogenesis are in two types, i.e. porphyry copper-molybdenum deposit and volcanic-subvolcanic hydrothermal deposit.