Geochemistry of Trace and Rare Earth Elements in Pyrite from the Baiji Antimony Lead Zinc Polymetallic Mineralization Site in Western Yunnan
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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