Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (6): 1697-1710.doi: 10.13278/j.cnki.jjuese.201606109

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Characteristics of Ore-Forming Fluid of the Sizhuang Gold Deposit in Shandong Province

Wang Li, Sun Liwei   

  1. College of Earth Sciences, Jilin University, Changchun 130061, China
  • Received:2016-03-17 Online:2016-11-26 Published:2016-11-26
  • Supported by:
    Supported by Fund Project of China Geological Survey(12120113098300);Item of Shandong Provincial Bureau of Geology and Mineral Resources(KY201203)

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Abstract: The Sizhuang gold deposit, located in the south section of the Jiaojia gold metallogenic belt and within the Jiaojia gold ore field, is a typical mesothermal gold deposit in the belt. There are three ore-controlling belts including the pyrite phyllic zone, the pyrite phyllic granitic cataclasite and pyrite phyllic granite zone. All the three ore-controlling belts occur in the footwall of the Jiaojia fault zone. The main ore minerals include electrum, pyrite, native gold, chalcopyrite, galena and sphalerite, etc.. The main wall-rock alteration types contain phyllic, silicification, potassium and carbonate, etc., and the gold mineralization has a close relationship with phyllic and silicification alteration. The comprehensive studies, such as the petrographic, microthermometric, laser Raman microspectroscopic analysis of the single fluid inclusion and the oxygen isotope analysis, are completed on fluid inclusions developed in auriferous ore of Sizhuang gold deposit. The results indicate that there develop three types of fluid inclusions in auriferous ore, including CO2-bearing, aqueous two-phrase, and CO2 fluid inclusions, existence at the same time, and fluid immiscibility occurred in CO2-H2O-NaCl system in the ore-forming process. The ore-forming fluids are featured by low salinity (w(NaCl) (0.53%-10.24%)), low density (0.50-1.03 g/cm3). Mineralization temperature is concentrated in 260-340℃, and the pressure ranges from 82 to 116 MPa, which equals to the depth of 7.40-8.94 km. The hydrogen and oxygen isotope analysis suggest that the δDV-SNOW of the ore-forming fluids is from -76.6‰ to -69.0‰ and the δ18OH2O is from 2.94‰ to 7.24‰, which shows that the ore-forming fluid are mainly from deep mantle fluids, with a small quantity of magmatic fluids and meteoric waters added. Comprehensive analysis, combined with geological characteristics of the Sizhuang gold deposit and the experimental results, suggests that the Sizhuang deposit belongs to the mesothermal type gold deposit. Moreover, this deposit was formed by the mantle-derived ore-forming fluid, and controlled by faults or fractures.

Key words: fluid inclusion, ore-forming fluid, ore genesis, Sizhuang gold deposit, Shandong Province

CLC Number: 

  • P618.51
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