Based on 1:200 000 regional geochemical exploration data obtained from the northern part of the Sanjiang region in combination with regional geochemical background,this paper has analyzed fairly in detail geochemical characteristics of various ages of strata and intrusive bodies.The metallogenic elements in this region are mainly As,Au,Cd,Hg,Ni,Sb,Ag,Cr,Pb,Sn,W,Zn and Cu.Such elements as Ag,Pb,Sn,Cd and Zn in the intrusive bodies are chiefly related to intermediate-basic volcanic activities,while the ore-forming actions of Cu,Mo,Bi and Au have close relationship with intermediate-acid magmatic activities.Cenozoic strata contain higher Cu than intrusive bodies of that age,and Mesozoic intrusive bodies contain much more Au than intrusive bodies of other epochs.These strata and intrusive bodies are therefore most likely to act as sources of ore materials.