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采用电子探针显微分析(EMPA)和粉末X射线衍射(XRD)分析了采自乌拉山金矿床含金钾长石石英脉、石英脉以及其他类型岩石中的10 0多个钾长石样品的化学成分和结果状态,并采用R和Q模式聚类分析、Spearman等级相关分析方法对实验数据进行了统计分析。结果表明,含金矿脉、岩浆热液脉和蚀变花岗岩中的钾长石为中等到最大微斜长石,其特征为K2 O含量高,但相对而言,Na2 O、CaO和BaO的含量低。其他岩石类型中的钾长石的化学成分和结果状态变化很大,可以从透长石、正长石到微斜长石,其特征为K2 O的含量相对较低,但Na2 O、CaO和BaO的含量相对较高。含金样品中的钾长石通常更富K2 O ,表明金的成矿作用与富钾的热液流体和碱质交代作用有关。乌拉山金矿床的成矿作用分为两个阶段,主要的含金钾长石石英脉中的钾长石富K2 O ,形成温度为30 7～379℃,平均为35 3℃;第二阶段含金石英脉中的钾长石含K2 O较低,形成温度为2 6 0～318℃,平均为2 81℃。这些结果表明成矿流体与岩浆热液作用有关,流体朝温度降低、K2 O含量降低的方向演化,K2 O含量高的热液流体和2 6 0～380℃的形成温度有利于金的成矿作用。
A total of more than 10 K-feldspar samples from gold-bearing feldspar quartz veins, quartz veins and other types of rocks collected from the Wulashan gold deposit were analyzed by electron probe microanalysis (EMPA) and powder X-ray diffraction (XRD) The chemical composition and the results of the state, and using R and Q mode clustering analysis, Spearman rank correlation analysis of the experimental data were statistically analyzed. The results show that the K-feldspar in the gold-bearing veins, magmatic hydrothermal veins and altered granites are medium-to-maximum microfacies characterized by a high content of K2 O, but relatively speaking, the content of Na2 O, CaO and BaO low. The K-feldspar in other rock types has a wide range of chemical compositions and results, ranging from periclase, orthoclase to slightly plagioclase, characterized by a relatively low K2O content, but with Na2 O, CaO and BaO content is relatively high. Potash feldspar in gold-bearing samples are generally more K2O-rich, indicating that the gold mineralization is related to the metathesis of potassium-rich hydrothermal fluids and alkalis. The mineralization of the Wulashan gold deposit is divided into two stages. Potassium feldspar is enriched in potassium feldspar in the main gold-bearing feldspar quartz veins, with a formation temperature of 30 7 ~ 379 ℃ and an average of 35 3 ℃. The second stage The K-feldspar in the gold-bearing quartz veins has a lower K2O formation temperature of 260-618 ° C and an average of 2 81 ° C. These results indicate that the ore-forming fluid is related to the hydrothermal effect of magmatic fluids. The fluid evolves in the direction of decreasing temperature and K2O content, and the hydrothermal fluids with high K2O content and the formation temperature of 260 ~ 380 ℃ are favorable for gold mineralization effect.