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Geoscience ›› 2020, Vol. 34 ›› Issue (05): 908-916.DOI: 10.19657/j.geoscience.1000-8527.2020.048

• Geochemistry • Previous Articles     Next Articles

Indium Distribution and Enrichment Characteristics in Gejiu Sn-Polymetallic Orefield Area in Yunnan Province

GUO Zhijuan1,2(), SONG Yuntao1,2, XU Renting1,2, WANG Chengwen1,2, YANG Fan1,2, WANG Qiaolin1,2, HAN Wei1,2, LIU Huazhong1,2, KONG Mu1,2   

  1. 1. Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang,Hebei 065000,China
    2. Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth’s Critical Zone,Chinese Academy of Geological Sciences,Langfang,Hebei 065000,China
  • Received:2020-02-09 Revised:2020-07-08 Online:2020-10-28 Published:2020-10-29

Abstract:

Different types of rocks from the Gejiu Sn-polymetallic orefield in Yunnan province were studied for the indium (In) distribution features in the granite, sedimentary and metamorphic rocks.The In enrichmentregularity in ore minerals was also analyzed via plasma mass spectrometry, petrographic identification and high-precision electron probe microanalysis (EPMA). Our results show that In content in the granites has clear relation with Sn, which plays an important role in the In enrichment.Indium is distributed in the source of ore-forming materials in the intrusion, and the In enrichment coefficient is higher in porphyritic biotite granite. The indium is mainly concentrated in the skarn of Gejiu Group limestone ore host, and there is no distinct In enrichment in metamorphic rocks. The indium is highly concentrated in the interlayer oxide ore but only weakly enriched in the primary sulfide ore, and In has positive correlation with Sn and Zn in the two types of ores. Indium is detected by EMPA in sphalerite but not in cassiterite, which indicates that In enters sphalerite and other sulfide minerals rather than cassiterite during ore precipitation.

Key words: scattered element, indium, distribution characteristics, enrichment rule, Gejiu

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