Typomorphic Characteristics and Metallogenic Indicative Significance of Pyrite in Beiling Gold Deposit, East Qinling

Beiling gold deposit is located in the Xiong'ershan polymetallic ore cluster in Eastern Qinling, as a typical tectonically controlled alteration rock gold deposit, its deep metallogenic potential needs to be explored urgently. This study focused on the gold-bearing mineral pyrite in the 530 m and 620 m elevation orebodies of the F881 ore body at the Beiling Gold Deposit. With the help of field geological investigation, mineralogical analysis, and systematic study of the production characteristics, composition standard characteristics and thermoelectric characteristics of gold-bearing mineral pyrite, the metallogenic temperature, formation depth and denudation rate of pyrite at different elevations are deeply discussed, and the following results and understandings are obtained: ① Analysis of pyrite samples at 530 m and 620 m elevations shows no significant difference in ω(Fe)/ω(As+S) values, which indicates that the pyrite at the elevations of the two elevations is in the middle and deep positions of the ore body. At the same time, the ω(Au)/ω(Ag) ratio indicates that the ore body is of magmatic hydrothermal origin. ② The average formation temperature of pyrite at 530 m elevation is 202～291 ℃, and the average formation temperature of pyrite at 620 m elevation is 219～275 ℃, The formation temperature of pyrite in the two elevations is basically the same, indicating that it was formed in a mesothermal environment.③In terms of ore body denudation rates over two elevations, the ones at the 530 m elevation is from 53.0% to 54.0% and the ones at the 620 m elevation is from 53.5% to 56.8%, showing a lower denudation rate overall. Based on the above research results, the pyrite samples of the two elevations of the Beiling gold deposit are in the middle and deep positions of the ore body, which indicates that there is room for extension of the ore body to the deep part and has great potential for deep exploration.