Occurrence And Source Of Cd Elements In Jinding Pb-Zn Deposit,Yunnan Province,China

The mineral resources in Yunnan area of China are rich and complete,and the three rare resources minerals have received great attention from the state in recent years.Among them,scattered element deposits are produced in the form of isomorphism or independent minerals.The Jinding Pb-Zn deposit is enriched with large-scale dispersed element cadmium ore resources(reserves up to 179,300 tons).Due to the long-term different understanding of the sources of ore-forming metals in the Jinding Pb-Zn deposit,it has unique Cd-rich characteristics compared with other types of Pb-Zn deposits,which can provide further understanding of the genesis.Large-scale cadmium ore resources and their forms of existence are also worth revealing through in-depth research.This article further understands the occurrence form and distribution of cadmium elements in Jinding lead-zinc deposits through different occurrence types of sphalerite(that is,different strata,elevation position,mineral morphology)and trace element characteristics of related sulfides.Combined with cadmium isotope data to speculate the source of metallogenic metal deposits in the Jinding Pb-Zn deposit,and at the same time provide a reference for promoting the understanding of the enrichment of dispersed elements in China.The research has achieved the following knowledge and achievements:1.The phenomenon of gypsum-salt diapirism in the Beichang ore section of the Jinding Pb-Zn deposit;2.The Cd content of different minerals in the Jinding mining area is sphalerite(0.04-7.374wt.%)>galena(0.063-0.193wt.%)>pyrite(0-0.08wt.%)≈marcasite(0.04-0.048wt.%);3.The study found that Cd is flashing The occurrence forms of zinc ore and rhodochrosite are mainly homomorphic and there is the possibility of ultra-micro inclusions;4.For the predecessorδ~114/11014/110 Cd isotope composition(seawater,river water,rocks,biology,etc.))Combined with the data research of Zn/Cd,it is found that the cadmium in the ore is mainly derived from the accumulation of microbial internal substances before mineralization and life metabolic activities,which makes the ore-forming hydrothermal fluid enriched with a large amount of light Cd isotopes(The average value isδ~114/11014/110 Cd=-0.05‰),and some data It indicates that the source of metal materials in Jinding Mining Area may be involved in deep magma.