Characteristics of platinum group minerals of Anyi Fe-PGE deposit and its genesis,Yunnan,China
Located in Mouding County,Yunnan Province,the Anyi Fe-PGE deposit is a large-scale titanomagnetite-type platinum group elements(PGEs)deposit which produces both platinum group elements and magnetite.There is little study on the occurrence state of PGEs in the deposit.In this paper,based on the field observation and petrographic identification,the mineralogical characteristics of platinum group minerals(PGMs)are studied by using TIMA and LA-ICP-MS-Mapping analysis methods,it is found that the platinum group elements(PGEs)mainly exist as independent minerals.Most of PGMs are arsenide and telluride of platinum and palladium,such as sperrylite,arsenopalladinite,kotulskite,and merenskyite,etc.,which mainly distribute in silicate minerals,and secondly in sulfide edges and some of them in magnetite edges.Magmatic and hydrothermal geneses are the main types for PGMs.PGMs formed by magmatism are distributed in silicate minerals or at the edge of sulfides.The PGMs distributed in silicate are a kind of nano-cluster formed by PGEs and semi-metallic elements in the early stage.The PGMs exist in the edges of sulfide is the result of crystallization of residual melt.PGEs are enriched in some minerals of titanomagnetite-bearing clinopyroxenite as the form of isomorphism by hydrothermal process-es,such as the chalcopyrite with strong hydrothermal alteration contains higher Rh,this is also consistent with the PGMs enriching in titanomagnetite-bearing clinopyroxenite.
platinum group mineralsgenesis of PGMsmagmatic Pt-Pd-Ti-Fe depositAnyiYunnan
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