Research on the Mineralogical Characteristics of Metallic Mineral and Mineralization of Huajian Gold Deposit,Eastern Hebei Province
KONG De-xin1 ,YIN Jing-wu1 ,HU Jian-zhong1 ,LI Jiao1 ,GUO Yuan1 , YANG Hai-tao1 ,SHAO Xing-kun1 ,YANG Xin-min2 (1. Institute of Earth Science,China University of Geosciences,Beijing 100083,China; 2. Huajian Gold Mining Co. Ltd,Kuancheng,Hebei 067601,China)
Huajian gold deposit is located in the eastern part of Hebei Province where contains abundant iron and gold resources. In order to decipher the mechanism of this gold deposit and guide the future mineral deposit exploration,we have studied the metallic mineral characteristics and compositional variations. In this paper, field investigations,microscopic identification and electron microprobe analysis are complished on the metallic minerals in Huajian gold deposit. Hydrogen,oxygen and sulfur isotopes are also analyzed to confirm the source of hydrothermal solution and sulfur of the ore-forming stage. The results suggest that pyrite and quartz are the main gold-bearing minerals in Huajian gold deposit and Au mainly exists as silver-bearing native gold. In this case,silver-bearing native gold generally occurs in the micro-fissures of pyrite or as inclusions in pyrite. The average sulfur value of pyrite is 52. 11% and it is lower than the theoretical value,indicating a magmatic hydrothermal genesis. The δD and δ18 O values of the fluid vary from 77. 9‰ to 68. 1‰,and from 9. 9‰ to 15. 7‰,respectively. The δ34 S values of pyrite vary from 3. 2‰ to 6‰. They indicate that the sources of oreforming solution are mainly magmatic fluid and sulfur is derived from deep-seated magma. We argue that the Huajian gold deposit is a magmatic hydrothermal deposit.