A SUMMARY OF METALLOGENIC,GEOCHEMICAL STUDY ON THE SKARN DEPOSITS

Recent study shows that the skarn deposit not only occurs in the contact between the intermediate-acidic intrusion and carbonate rocks but also in the contact of the basic intrusion or in the distal strata;not only hosted by the carbonate rocks but also by the active volcanic sedimentary rocks,such as the volcanic sedimentary tuff.The vast majority of skarn deposits are related to magmatic arcs in the subduction zone beneath the continental crust with the mesothermal to epithermal ore-forming temperature and the shallow to medium ore-forming depth.The abyssal environment is not favorable for the formation of skarn.Ore materials of the skarn deposit mainly come from deep source with partial crust materials involved.The ore fluid shows certain difference for different evolution stages.The early stage is with magma water preference and the later stage with meteoric water preference.