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You are here: Home » Past Issues » Volume 9, 2014 - Number 3 » THE GEOCHEMISTRY RESEARCH ON FLUID OF THE DAXIGOU GOLD MINE, FENGNING, HEBEI PROVINCE


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Deng LEI1,2,3, Cao YE4 & Zhang JIEJIE5
1School of Earth Environment and Water Resources, Yangtze University, Wuhan, Hubei Province, 430100, China
2Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Wuhan, Hubei Province, 430100, China
3Yangtze University College of Engineering Technology, Jingzhou, Hubei Province, 434000, China
4China Chemical Geology and Mine Bureau, Beijing, 100013, China
5School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China
Corresponding author: e-mail: cykaiyang@163.com

THE GEOCHEMISTRY RESEARCH ON FLUID OF THE DAXIGOU GOLD MINE, FENGNING, HEBEI PROVINCE

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Abstract:

Using temperature in microscope, composition and hydrogen and oxygen isotope testing, this study provides an in-depth analysis on fluid inclusions’ parameters of the Daxigou gold mine and the characteristics of the ore-forming fluid. The results show that the inclusions in the quartz which displays close relations with Daxigou gold mineralization contain three types of inclusions: gaseous inclusion, gas-liquid inclusion and liquid inclusion, of which the latter two types are most common. The homogenization temperatures of the inclusions are mainly concentrated in 175°C ~ 275°C, with the salinity of 2% to 7%, the fluid density of 0.804 ~ 0.959g/cm3, and the mineralization depth of 1.01 ~ 2.24km. The vapor in fluid inclusions is mainly composed of H2O and CO2; in fluid inclusions liquid, the main cations are Na+ followed by Ca2+, K+, and the anions are SO42- and Cl- followed by only traces of F-. The δ18O water values in quartz are 2.1 ‰ ~ 5.8 ‰, and the δD values are -87‰ ~ -103.67%, reflecting the ore-forming fluids coming from magmatic water and atmospheric precipitation. By calculating the gas fugacity, gold in the Daxigou gold ore-forming fluids mainly migrates in the form of complex [Au (HS)2]-. The complex process and hydrothermal alteration are the major factors for gold precipitation and enrichment.


Keyword: Fluid inclusion; ore-folding fluid; geochemistry; Daxigou gold mine; Hebei


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