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Chinese Journal of Geochemistry

, Volume 17, Issue 3, pp 249–257 | Cite as

Silicon isotope geochemistry of micro-fine disseminated gold deposits in SW Guizhou and NW Guangxi, China

  • Liu Xianfan
  • Ni Shijun
  • Lu Qiuxia
  • Jin Jingfu
  • Zhu Laimin
Article

Abstract

Quartz was studied with respect to its silicon isotopic composition and cathodoluminescence in micro-fine disseminated gold deposits in SW Guizhou and NW Guangxi. The results showed that quartz in wall rocks, ores and that in association with hydrothermal silicification are distinctive in silicon isotopes and cathodoluminescence characters. Quartz in association with primary silicification is non-luminescent while that in wall rocks and associated with secondary silicification exhibits striking luminescence. Based on the dynamic fractionation of silicon isotopes, it is suggested that the mineralization was accompanied by rapid transport of a primary siliceous fluid along the major deep fault system into subordinate faults before ore components deposited in favorable strata via penetration and metasomatism. Therefore, a deep origin is implicit for gold deposits of this type.

Key words

silicon isotope cathodoluminescence of siliceous material isotopic tracing of the source of mineralization micro-fine disseminated gold deposit 

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Copyright information

© Institute of Geochemistry, Chinese Academy of Sciences 1998

Authors and Affiliations

  • Liu Xianfan
    • 1
  • Ni Shijun
    • 2
  • Lu Qiuxia
    • 2
  • Jin Jingfu
    • 2
  • Zhu Laimin
    • 1
  1. 1.Open Laboratory of Ore Deposit Geochemistry, Institute of GeochemistryChinese Academy of SciencesGuiyang
  2. 2.Chengdu University of TechnologyChengdu

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