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Russian Geology and Geophysics

2006 year, number 3

PORPHYRY COPPER-MOLYBDENUM ORE ASSOCIATION: GENESIS, DIMENSIONS, AND BOUNDARIES

V.I. Sotnikov
Institute of Geology, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga,
Novosibirsk, 630090, Russia
Keywords: Porphyry Cu-Mo ore association (dimensions and boundaries), mantle-crust interaction, mixing of different magmas
Pages: 355-363

Abstract

The problem of the dimensions and boundaries of porphyry Cu-Mo ore association is discussed in terms of the genesis and occurrence of ore-forming porphyry magmatism, geochemistry and zoning of mineralization, and geologic and physicochemical conditions of ore-metasomatic processes. With regard to the common Cu-Mo composition of deposits (though essentially copper and essentially molybdenum deposits were also considered) and their intimate relationship with granitoid porphyry intrusions (of both deep-level basaltoid and shallow-depth genesis in a relatively open environment), all porphyry Cu-Mo deposits can be united into a single porphyry Cu-Mo association, which is subdivided into porphyry Cu, porphyry Mo-Cu, porphyry Cu-Mo, and porphyry Mo types. Defining the boundaries of ore association requires analysis of all products of a porphyry Cu-Mo ore-magmatic system with regard to the common zoning of produced mineralization: Fe-Mo (Cu)-Cu (Mo)-Cu (Au)-Fe (Au)-Pb, Zn-Au (Ag).