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《中国有色金属学报(英文版)》 2016-08
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Occurrence characteristics and enrichment regularity of indium in pyrite: A case study of Dachang tin ore-field

Yong-sheng CHENG;Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education, Central South University;School of Geosciences and Info-Physics, Central South University;State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry,Chinese Academy of Sciences;  
To reveal the occurrence state and enrichment regularity of the dispersed element indium in pyrite, the petrology, mineralogy, geochemistry, and mineral physics were researched detailedly. The results suggest that the structure of pyrite is mainly composed of massive structure, disseminated structure, vein structure, reticular structure, comb structure and so on. Generally, the pyrite coexists with sphalerite, marmatite, pyrrhotite, chalcopyrite, galena, and arsenopyrite. And the texture of pyrite primarily consists of the metasomatic texture, solid solution texture, idiomorphic-hypidiomorphic granular texture, and disseminated texture. The content of indium in pyrite ranges from 0.491×10~(-6) to 65.1×10~(-6) with an average value of 14.38×10~(-6). Yet, the indium content in the Gaofeng deposit is higher than that in the Dafulou and Tongkeng deposit, showing a particularly significant supernormal enrichment. Besides, the cadmium content in pyrite is also higher than other dispersed elements, and similarly the abnormal enrichment of cadmium in the Gaofeng deposit is also very significant. An obvious positive correlation exists between In and Cd, or Tl, but a negative correlation between In and Re. It is difficult to find out a positive or negative correlation between In and Ga. The element zinc is of great importance to the enrichment of indium, which can possibly facilitate to the migration and crystallization of dispersed element indium.
【Fund】: Projects(41202051 41672076)supported by the National Natural Science Foundation of China;; Project(2015CX008)supported by the Innovation-driven Plan in Central South University China;; Project(2016JJ1022)supported by Hunan Provincial Natural Science Outstanding Youth Foundation of China;; Project(CSUZC201601)supported by the Open-End Fund for the Valuable and Precision Instruments of Central South University China;; Project(2014T70886)supported by the Special Program of the Postdoctoral Science Foundation of China;; Project(2012M521721)supported by China Postdoctoral Science Foundation;; Project(XKRZ[2014]76)supported by the Platform of Scientific and Technological Innovation for Hunan Youth China
【CateGory Index】: TF843.1
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