| The Qinling Orogenic Belt belongs to the core area of the Central Orogenic Belt.Because of its special structural location and evolutionary history,it produces abundant mineral resources and is known as China's "gold belt".A series of medium-sized gold mines such as Yangshan Gold Mine,Huachanggou,Jianchaling,Dashui Gold Mine and Nanping Gold Mine,Ganheba Gold Mine have been found in the Mianlue suture zone located in South Qinling.Small gold mine.The Shuidegou gold deposit is another medium-sized gold deposit found in the Mianlue belt,but the predecessors focused on prospecting and exploration work,and there is little research on it.The understanding is not yet clear,which limits the further expansion of the deposit.Therefore,sufficient research work has been carried out at the Shuidegou Gold Mine in order to provide a theoretical reference for the subsequent prospecting direction of the Shuidegou Gold Mine,and at the same time play a positive role in the improvement of the entire Mianlue belt metallogenic system.The main progress is as follows:Systematic field work was carried out in the mining area.It is found that the Shuidegou gold deposit is controlled by the middle lithology section of the Qiaozigou volcanic rock formation,and its lithology is mainly sericite feldspar schist,strong pyrite mineralization,silicified sericite quartz schist,and chlorite quartz schist,Strong fragmentation and alteration of quartzite,etc.;the scale of the ore body is controlled by two ductile and brittle shearing and alteration zones of F5 and F6;pyrite mineralization,silicification and mineralization are inextricably linked,and can be regarded as important in the mining area prospecting sign.After carrying out detailed petrographic and mineralogical studies on the gold-bearing iron ore in the laboratory,combined with electronic probe analysis,the pyrite in the Shuidegou gold mine is divided into cubic pyrite and pentagonal dodecahedral pyrite,Five types of pentagonal dodecahedron polypyrite,fragmented pyrite and fine-grained pyrite;their composition shows the characteristics of deficient in sulfur and iron and rich in arsenic;found that gold is mainly given in the form of cracked gold There are cracks in pyrite pyrite,and in the form of invisible gold in pentagonal dodecahedral pyrite and toxic sand.Observation and sampling of quartz veins in the mining area and temperaturemeasurement and laser Raman analysis of fluid inclusions in veins.The quartz veins in the Shuidegou gold deposit are divided into three stages,of which the second-stage quartz veins are abundantly developed in the ore body,and gold-bearing iron ore and bright gold can be seen.Single-phase aqueous solution inclusions,H2O-CO2 inclusions and LH2 O + LCO2 +VCO2 inclusions are developed;their uniform temperature is concentrated at 240 ~ 320 ?,salinity is concentrated at 7 ~ 13 wt.% Na Cl eqv,with low and medium salinity Characteristics;The density of ore-forming fluids is estimated to be concentrated at 0.81 ~ 0.95 g / cm3,ore-forming pressure is concentrated at 88 ~ 108 Mpa,and the depth of mineralization is concentrated at 2.2 ~ 3.7km;its composition includes CO2,CH4 and N2,showing the characteristics of metamorphic fluid.The tectonic background,geological and fluid evolution characteristics of the Shuidegou gold deposit are very consistent with the characteristics of the orogenic gold deposit,which is consistent with the geological characteristics of the orogenic gold deposit in the Mianlue belt.From the perspective of the tectonic background and metallogenesis,the water Degou Gold Mine is another typical orogenic gold deposit in the Mianlue Belt.From the perspective of mineralization characteristics,gold mineralization in the Shuidegou area is strictly controlled by Qiaozigou metamorphic volcanic rocks and two ductile shear zones,F5 and F6,and its deposit type can be classified as a structure controlled by ductile shear fracture zones Altered rock type gold deposit. |
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