Three types of continental geodynamics and metallogenic models for IOCG(Iron-oxide Copper Gold Deposits)from the global view

Aim To study the different backgrounds of continental geodynamics for Iron-oxide Copper Gold Deposits(IOCG) with three different metallogenic models from the global view,although Iron-oxide copper gold deposits(IOCG)and their U-REE intergrowthing in useful components,one clan of the deposit associations have been paid much attentions by mining,exploration and geology sectors,and still ill-defined clan of mineralization styles of geotectonic settings and magmatic environments.Methods IOCG related to extensional environment of arc orogenic belt by oceanic crust subduction in Chile and Peru and IOCG in Yunnan-Sichuan Provinces of China,two case studies have been completed,based on the Proterozoic rifted basin of continent and the basin-fluid-mixing model from the global view.Results It may be supposed that copper-gold-bearing magnetite deposits could be related to hypogene diorites with a evolution from diorite to grabbo-diorite,to anorthosite plus amphibolite porphyrite while copper-gold-bearing specularite deposits related to hypogene diorites with a evolution from diorite to granodiorite,to quartz diorite,and to granite.Iron-tianium-oxide-copper-gold deposits may be supposed to be the third type of continental geodynamics and metallogenic models for IOCG.In the Middle Proterozoic age,IOCG could be formed in continent-rifted basin without oceanization,and with IOCG and iron orebody beds produced by volcanic eruption of Fe-enriched,Na-basic magma while copper-silver orebody beds hosted in tuff and tuffaceous dolostone formed by trachytic magma.After Jinning orogenic movement,hypogene alkaline diorites and grabbo under mantle plume emplaced and high oxidation,resulted in the former orebodies superimposed and orebodies of ilmenite-ilmenomagnetite hosted in alkaline diorites and grabbo bodies.Iron-titanium-oxide copper gold deposits were hosted in cryptoexplosive breccia body around bodies of hypogene alkaline diorites and grabbo.Therefore,Iron-titanium-oxide copper gold deposits in Yunnan-Sichuan were formed in two different processes of continental dynamics and metallogenism with higher potential for exploration in the future.Conclusion The global IOCG(Iron-oxide Copper Gold Deposits)from the global view might have been formed in three typical types of different continental geodynamics with typical metallogenic models.Firstly,Olympic Dam of Iron-oxide copper gold deposits(IOCG)and their U-REE intergrowthing in useful components in Australia might have been formed by hydrothermal sedimentation in continental rifed basin in the Proterozoic age(1900Ma-1400Ma),later superimposed and reworked by the basin-fluid-mixing model.Secondly,Iron-oxide copper gold deposits(IOCG)in south America as typified by IOCG of Chile could have been produced in extensional tectonic background in arc orogenic belts with subduction by oceanic crust in Chile and Peru,where localization of IOCG in extensional tectonic background in arc orogenic belts could been related to the mantle plume upswelling.Finally,Iron-titanium-oxide copper gold deposits in Yunnan-Sichuan of China were formed by volcanic exhalative sedimentation in the former Proterozoic rifted basin,and superimposed by hypogene alkaline diorites and grabbo related to palo-mantle plume.