河南小秦岭金矿稀土元素地球化学特征及地质意义

小秦岭金矿产于新太古界太华群变质岩中，其中的次级拆离断裂为赋矿构造。为了探究矿床的地球化学特征和矿床成因，从矿区主要地质体采集了100件来自太华群地层、文峪岩浆岩和矿石的样品进行测试，其稀土元素的主要特征为：太华岩群的ΣREE值为30.81×10^-6~188.66×10^-6；δEu值为0.62~1.24；花岗岩和脉岩类ΣREE值为58.22×10^-6~365.98×10^-6；δEu为0.90~1.10；矿石的ΣREE值多集中于76.74×10^-6~358.22×10^-6,δEu值多集中于0.74~1.14。结果表明：各地质体稀土总量接近，没有Eu异常或有微弱的正、负铕异常；矿石的稀土元素含量特征与太华群接近，而与文峪等花岗岩相差较远。分析认为，成矿物质主要来源于太华群地层而不是花岗岩。

REE Geochemical Characteristics of Xiaoqinling Gold Deposits and Their Geological Significance

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.