| The Lianzigou gold deposit is located at North 35 KM of Luonan County,Shaanxi Province.It is located at the south side of the western Taihua uplift of the western Yuxi fault uplift of the southern margin of the North China platform.It has been found that Hulugou altered gold deposit has high gold and molybdenum anomaly and has certain prospecting potential.Since the study of Lianzigou Gold Mine has been carried out for a long time,and the previous studies mainly focus on the characteristics of the deposit,isotopic geochemistry and so on.Based on the data of field exploration and observation under microscope,mineral characteristics and occurrence state of gold-bearing minerals of Lianzigou gold deposit are found out by means of EPMA,and its chemical composition is analyzed.Based on the observed field geological phenomena,the metallogenic stage of Lianzigou gold deposit can be divided into three stages,i.e.potash feldspar-quartz stage,quartz-pyrite stage,gold-polymetallic sulfide-telluride stage,quartz-calcite-barite stage.The main metallic minerals in Lianzigou gold deposit are pyrite,chalcopyrite,tetrahedrite,galena,sphalerite,tellurite,tellurite gold,tellurite and so on.EPMA data show that pyrite has the characteristics of Fe deficiency,and the average value of Co/Ni in trace elements is more than 1,indicating that the mineralization is related to magmatic hydrothermal fluid.The Zn-Fe geothermometer of sphalerite indicates that the metallogenic temperature is moderate and low.The occurrence of telluride indicates that the ore-bearing hydrothermal fluid comes from the deep part,and further verifies that the ore-forming temperature is moderate and low temperature.Pyrite,tetrahedrite and lead-tellurite are closely related to the occurrence of gold minerals.Gold minerals are mostly intergranular gold,and the wrapped gold and fracture gold are rare.Gold-bearing and silver-telluride minerals appear as irregular grains among the mineral grains,showing the mineral association of tellurite-gold-silver-tellurite-lead ore and silver-bearing natural gold-tellurite-lead ore.The homogenization temperature of quartz inclusions in gold ore bodies is between 179 ? and 232 ?,and the average homogenization temperature is200 ?.To sum up,the gold minerals in Lianzigou gold deposit are mainly natural gold and gold-bearing telluride,and are closely related to pyrite,tetrahedrite,lead-tellurite and other minerals.Therefore,Lianzigou gold deposit is a mesothermal gold deposit. |
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