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Delineating the structural controls on the genesis of iron oxide–Cu–Au deposits genesis through implicit modellinging: A a case study from the E1 Group, Cloncurry District, Australia

Posted on 2017-03-30 - 10:57
Iron oxide–Cu–Au (IOCG) deposits encompass a range of ore body shapes, including strata-bound replacement ores and hydrothermal breccias. We use the implicit method to make a detailed three-dimensional geological model of a strata-bound IOCG in the Cloncurry Ddistrict, the E1 Group, to elucidate structural controls on mineralization. This model is compared to with the nearby, world-class, Ernest Henry breccia-hosted IOCG deposit. Copper mineralization in the E1 Group occurs as structurally-controlled, mainly strata-bound, replacement bodies hosted in metasedimentary and metavolcaniclastic rocks intercalated with barren meta-andesite. Replacement bodies in the E1 Group conform to a series of NNW- plunging folds formed in regional D2 during peak metamorphism. Folding was followed by local D3 / regional D4 shortening, that which formed a dextral, transpressional Riedel brittle to ductile system along the regional Cloncurry Fault Zone. Modellinging suggests that much of the Cu–Au mineralization is controlled by synthetic R structures associated with this Riedel system. The deformation sequence at Ernest Henry is comparable, but differences in host rock rheology, permeability and fluid pressure may explain the variation in ore body types and total Cu–Au resource between the two deposits. The results carry implications for other districts containing these styles of IOCG mineralization.

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