Based on the rare earth and trace element composition of pyrite in the early mineralization stage,the properties of ore-forming fluids and ore-forming types were deduced.Pyrite LREE enrichment,HFSE deficit,changing Y/Ho,Nb/Ta and Zr/Hf characteristics indicate that the ore-forming fluids at this stage are mainly Cl-rich fluids,and a small amount of F-rich fluids are mixed in.The weak positive Eu anomaly and the weak negative Ce anomaly indicate that the ore-forming fluid of this stage belongs to the weakly oxidizing fluid.The pyrite samples generally have a high Co content(209×10-6～7 610×10-6,with an average of 2 041×10-6)and Ni content(109×10-6～2 550×10-6,with an average of 746×10-6).The variation of Co/Ni ranges from 0.86 to 6.83(with an average value of 2.82).It is inferred that the pyrite-molybdenite-quartz mineral association formed in the early stage of Baiji mineralization point is the product of the joint action of magmatic hydrothermal solution and epithermal solution.This study provides a basis for improving regional mineralization.
western Yunnanantimony-lead-zinc polymetallic mineralizationpyriterare earth elementstrace elements
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