The Bairendaba silver polymetallic deposit in Inner Mongolia, China: characteristics of ore-forming fluid and genetic type of ore deposit

3rd International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Wang, Ying^1 ; Xie, Yuling^1 ; Wu, Haoran^1

Department of Resource Engineering, University of Science and Technology Beijing, Beijing

100083, China^1

关键词: Geological characteristics;    Great Xing'an range;    Homogenization temperatures;    Hydrothermal activity;    Hydrothermal deposits;    Low temperatures;    Metallogenic belt;    Ore-forming fluid;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/113/1/012015/pdf
DOI  :  10.1088/1755-1315/113/1/012015

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Bairendaba silver-polymetallic deposit is located in the middle south of the Xing Meng orogenic belt, and in the silver-polymetallic metallogenic belt on the west slope of the southern of Great Xing'an Range. Based on studying of the fluid inclusion, we discuss the characteristics of ore-forming fluid and the metallic genesis of the Bairendaba silver-polymetallic deposit. By means of the analysis of the fluid inclusions, homogenization temperature, salinity and composition were studied in quartz and fluorite. The result is as the follows: with homogenization temperatures of fluid inclusions in quartz veins being 196∼312 C, the average 244.52 C, and fluid salinity 2.90∼9.08 wt%NaCl; with homogenization temperatures of fluid inclusions in fluorite being 127∼306 C, the average 196.92 C, and fluid salinity 2.90∼9.34 wt% NaCl. The ore-forming fluid is mainly composed of water and the gas. The results of laser Raman analysis show that the gas phase is mainly CH4. It shows that the ore-forming fluid is characterized by medium-low temperature and low-salinity system. The temperature of ore-forming fluid is from high to low, and the salinity from high to low, and the meteoric water or metamorphic water is added during deposit. According to the geological characteristics of the mining area, it is considered that the genetic type of the ore deposit should be the fault-controlled and the medium-low temperature hydrothermal deposit related to magmatic hydrothermal activities.