关键词: 小秦岭金矿, 稀土元素, 成矿物质, 河南省

Abstract:

The Xiaoqinling gold deposits are located in the Neoproterozoic Taihua Group, of which the secondary detachment faults are the major ore bearing structure. In order to figure out geochemical characteristics and genesis of ore deposit, we collected 100 samples from the Taihua Group , magmatic rocks and gold ores of main geological body in the study area, respectively. The main characteristics of rare earth elements are as  following: the ΣREEs of Taihua Group are from 30.81×10^-6 to 188.66×10^-6, and the δEu values are from 0.62 to 1.24; ΣREEs of granite and dike rocks are from 58.22×10^-6 to 365.98×10^-6, and the δEu values are from 0.90 to 1.10;ΣREE of gold ores are mainly concentrated in 76.74×10^-6-358.22×10^-6,δEu values are mainly concentrated in 0.74-1.14. The results show that the ΣREE from the three kinds of geologic body are similar, and there is no Eu anomaly or there are only weakly positive and negative europium anomaly. The rare earth distribution of ores is similar to that of the Taihua Group, and is different from that of Wenyu granite. It proves that the ore-forming materials come from the Taihua Group instead of granite.

Key words: Xiaoqinling gold deposit, REE, ore-forming material, Henan Province