Abstract:

According to the ore texture, gold occurrence, shape and pyroelectricity of pyrites of vein Ⅲ in the Erdaogou gold deposit in Western Liaoning, the authors discussed the ore-forming temperatures, denudation rates and evaluated the ore deep prospects. The studies prove that the gold occurrence in the ores was unhomogeneous. The pyrite was mainly P-type and varied widely, with a few N-type, in terms of pyroelectricity, which indicated that a few part of the orebody was removed by uplift and erosion. Possibly, there were several hydrothermal activities superposed each other in the Erdaogou gold deposit. The metallogenic hydrothermal solution came from southeast direction. Though the initial hydrothermal temperature was high, most metal minerals precipitated when the temperature ranged from 150 to 300 ℃, indicating that the Erdaogou gold  deposit belonged low-medium hydrothermal type. The pyroelectricity measurements of pyrite indicated that denudation rate was similar, even though the pyrites were different in frequency of P-type, forming temperature and gold content.

Key words: pyrite, pyroelectricity, ore fabric, Erdaogou gold deposit, Beipiao, Western Liaoning