摘要
The Jinchang Cu-Au deposit,a super-large ore deposit explored in the latest,is mainly of breccia-type ore body and is spatially closely associated with diorite porphyry which is apophysis like and porphyry structure with mainly plagioclase, hornblende and little pyroxene as phenocryst. The geochemical data suggests that the diorite porphyry is probably adakitic rock and were produced by crustal contamination and fractionation of mafic magmas generated from partial melting of mantle source which had been metasomatismed by the subduction fluid. It is potential to exploration the porphyry-epithemal system copper-gold deposit of the same period in the eastern part of Jilin and Heilongjiang provinces.