Pyrite Typomorphic Characteristics and Stable Isotope Studies of Yixingzhai Gold Deposit in Fanshi County, Shanxi Province, Chinaoft-com:office:office" />
详细信息
- 责任者：Li Chenglu (Heilongjiang Institute of Geological Survey ; Harbin 150036 ; China) ; Li Shengrong
- 刊名：Journal of Mineralogy and Petrology
- 出版年：2013
- 卷期：33(1)
- 页码：p.1-7
- issnNo：ISSN1001-6872
- isbnNo：CN51-1143/TD
摘要
Pyrites are common and important gold-bearing minerals widely existing in gold deposits.Detailed research is made on typomorphic characteristics of pyrite from Yixingzhai gold deposit in Shanxi,China,including its chemical composition,decrepitation temperature and stable isotope.Results shows that chemical composition,major and trace elements in pyrites and S/Fe,Au/Ag,Co/Ni,Fe/(S+As),δFe-δS,Co-Ni-As diagrams,have their own typical composition typomorphic characteristics.In fact,chemical composition of pyrite is rich in iron and low in sulfur,content of Au in pyrite is high,and the content of Ag in pyrite is low,both of them show reverse relations.According to the characteristics of pyrite composition,the outcropping ore bodies are located on the mid-low parts of mineralization centre.Co and Ni are widespread in pyrite and showing large variation of Co/Ni ratio ranging from 3.75 to 40,with average value of 10,indicating that the Yixingzhai deposit belongs to magmatic hydrothermal type gold deposit.Fe/S+As show that the mineralization environment is medium-shallow in depth.Co-Ni-As show the genetic types is shallow epithermal and magmatic hydrothermal one.Decrepitation temperature curves gives a good display on the change of hydrothermal fluids in different metallogenic stages,and the results of decrepitation temperature ranging 146 ℃ to 372 ℃,indicating that the Yixingzhai deposit belong to medium-low temperature deposit.The variation of S isotope is small,ranging from-3.2‰ to +3.5‰,mainly 2‰～3‰,characteristic of magmatic sulfur.Pb isotopic composition of ore is stable.The 206Pb/204Pb,207Pb/204Pb,208Pb/204Pb values of ores varied in a range of 16.524～16.628,15.284～15.3212 and 36.686～36.812 respectively.These data are plotted near the lower crust and upper mantle setting,consistent with Pb isotopic composition of magmatic rocks in the deposit.The evidence from the diorite complex body and mineralization age indicates that the gold mineralization closely related to the Yanshanian large-scale magmatic activity.