Control of structure and magma for Iron Oxide-copper-gold and porphyry Copper-gold deposits

Iron oxide-copper-gold(IOCG) and porphyry copper deposits are all important exploration target due to their large-scale,high economic value.They are together generated in Chile subduction-related continental margin,including the world's large copper porphyry deposits,and have a sharp mineralization sequence in space-time from magnetite-apatite,IOCG,porphyry copper-gold to porphyry copper molybdenum deposits with tectonic-magmatic evolution.Large number of calc-alkaline magmatism and contemporary igneous rocks are an important foundation for formtion of mineralization.Shallow breccia pipes of IOCG deposits share with the alteration features of porphyry copper deposits.Gold-rich porphyry copper deposit have some similar characteristics and more transitional relation to porphyry deposits due to the key factors of evolution of magma intrusion and fluid.It is necessary to pay more attention to structure and alteration of rocks during the exploration.