The magma conduit model has profoundly impacted the understanding of magmatic Ni-Cu sulfide deposit formation,establishing a new paradigm for research and exploration in this field.This model elucidates the decoupling of sulfide liquid segregation from its accumulation,thereby establishing a direct genetic link between the formation of such deposits and the depletion of platinum-group elements in related basalts.Furthermore,it provides a compelling explanation for the consistently low sulfide content observed in the wall rocks of the mineralized intrusions.This paper summarizes the core connotation of the magma conduit model as"two deep,one shallow,and a single channel."The"two deep"principle refers to the mantle origin of metallogenic materials and the depth-dependent segregation of sulfide liquids during magma processes.The"one shallow"refers to the accumulation of sulfide liquids at relatively shallow depths.Finally,the"single channel"means that a positionally stable magma conduit is more beneficial to the formation of large ore deposit.An analysis of classic deposits and metallogenic belts suggests that relatively large intrusions emplaced in shallower crustal depths exhibit a greater mineralization potential compared to channel facies situated at deeper levels.This observation underscores the fact that surface mineralization is not a reliable,or even indicative,factor for prospecting.To optimize the efficiency of prospecting,particularly for concealed ore deposits,it is essential to meticulously assess the burial and exposure status of the magma conduit system across various locations within a metallogenic belt.Determining the characteristics,distribution,and original depths of the magma channel within both deep and shallow intrusions is crucial.This knowledge will enable the targeted selection of key areas and the application of appropriate exploration techniques,ultimately guiding prospecting drilling programs towards the most promising intrusions.
关键词
岩浆铜镍硫化物矿床/岩浆通道成矿模型/含矿岩体产状/侵位深度/围岩时代
Key words
magmatic Ni-Cu sulfide deposit/magma conduit model/field relationship of mineralized intrusion/emplaced depth/age of wall-rock
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