| The Sanguanmiao gold deposit is located in County of Shanxi Province,is located in the southern Qinling Mountains Indosinian fold zone with-fold beam on the north side of the Baishuijiang river.Because of its complex geological structure,it has good metallogenic environment and geological conditions.Based on field geological phenomena were observed in the Sanguanmiao Gold Deposit and collected indoor rock features and hand specimens,using optical microscope to observe the thin sections,mineralogical characteristics of ore comprehensive research,finally combined the relationship between minerals,is divided into three stages of mineralization in this area,namely: albite stage,quartz polymetallic sulfide stage and carbonate stage.Pyrite,chalcopyrite,sphalerite and galena are the main ore minerals in this deposit.The gold silver minerals mainly include silver,natural gold and silver gold deposits.Their material components were investigated in detail by means of electron probe microanalysis.The study shows that the pyrite in this area is sulfur deficient and the average value of Co/Ni is greater than 1,which indicates that the mineralization of the Sanguanmiao gold deposit is related to hydrothermal fluid.The contents of S and Fe in chalcopyrite are low,which may be caused by other sulfides competing for the elements in hydrothermal solution.The Fe S content in sphalerite can be used to predict metallogenic temperature.The content of Pb in galena is low,which may be the isomorphism of other elements,thus replacing the Pb element.The content of Au in the early stage of the formation of the silver containing natural gold is higher,and the content of Au in the late formed Ag Au deposit is a little low,which may be the characteristic of Ag enrichment.The early gold minerals are high in fineness and low in late maturity,which is caused by the complex metamorphism and magmatic activity in the area.In the same gold mineral particles,the content of Au increased gradually from the edge to the nucleus and then to the edge,and reached the highest in the nucleus,and then decreased,indicating that Au was mainly concentrated in the nucleus.The occurrence of gold bearing minerals mainly consists of intergranular gold,inclusion gold and fissure gold,among which,intergranular gold is more.The average fineness of the gold bearing minerals in this area is 858.667,according to the color,the depth of mesogene mineralization.Because the mineral content of gold is positively related to the ore-forming temperature and depth,it can be inferred that the deposit belongs to the middle and low temperature deposit.To sum up the above mentioned,the Sanguanmiao gold deposit belongs to mesothermal mesothermal type gold deposit. |
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