Study on the magnetite genesis and metallogenic age in Chedu gold deposit, Bikou block

3rd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Wang, Dequan^1 ; Deng, Shengbo^2 ; Wang, Yizhong^2

Sino Shaanxi Nuclear Industry Group, Shaanxi province, China^1

Sino Shaanxi Nuclear Industry Group 214 Brigade Co. Ltd., China^2

关键词: Bikou terrane;    Gold ores;    Indirect methods;    Isotope age;    Neoproterozoic;    Probe analysis;    Proterozoic;    Single particle;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/300/2/022053/pdf
DOI  :  10.1088/1755-1315/300/2/022053

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The Chedu gold deposite is located in the south rim of bikou terrane. It is the first BIF-type gold deposit in shaanxi province. Magnetite and quartz bands can be seen in the magnetite quartzite type gold ore. According to the electronic probe analysis results, we find that the ratio ofTFeO to oxide is from 98.90% to 99.87% and the levels of TiO2, MgO, A12O3 and MnO are low in single particle magnetite. It is suggested that the magnetite in gold ore is the cause of sedimentary metamorphism. In addition, a total of 22 of the 35 electronic probe analysis data implying that the magnetite was not visible. The maximum is 0.105%. Through the analysis of geochemical samples, the gold grade is proportional to the iron content.The isotope age of the Bikou group is between 764 and 1611 Ma. The indirect method proves that the Chedu magnetite quartzite gold deposit was formed in the Middle Proterozoic-Neoproterozoic.