Geological Characteristics And Genesis Of Shangzhuang Gold Deposit, Zhaoyuan, Shandong Province

Shangzhuang Gold Deposit is located in the Wangershan Fault Zone of theJiao-Wang Gold Field in Zhaolai of northwest Jiaodong, and under the jurisdiction ofthe Canzhuang Gold Deposit.In the mine area, the Wangershan Fault Zone is the main ore-controllingstructure,and the host wall rocks include Linglong gneissic granite and Guojialingporphyritic granodiorite. The ore bodies mainly occur in the contact zone of Linglonggneissic granite and Shangzhuang rock. Type of deposit is altered rock type golddeposit.More than twenty gold ore bodies are found in the Shangzhuang Gold Deposit, theore bodies mainly output as veins, lenticula or irregular-shaped, and have diversifiedsizes. The orebodies Overall strike NE, trend of NW, and dip angle of30°to40°.andshow the SW lateral trending. The main Feature is the equidistant pinchoutreproduction occurs in the ore body in the deposit.The ore minerals are divided into the metallic minerals and the non-metallicminerals, the metallic minerals include pyrite, chalcopyrite, galena, sphalerite,bismuthinite, native gold, native silver, electrum, bismuth sulfosalt minerals, pyrrhotite,magnetite, specularite, hematite, and the non-metallic minerals quartz, sericite,K-feldspar, calcite and else.In the deposit, the common ore textures include etched, separation of solidsolution, pressure, poikilitic and milk droplets textures. The ore structures includevein（mesh-vein）, disseminated, punctate, lump and brecciated structures.In Shangzhuang gold deposit, alteration is Developed, including potassic alteration,silicification, phyllic alterationand carbonatization. Pyrite phyllic and Pyrite phyllicgranitic rock are closely related to gold mineralization.The ore body’s occurrence are strictly controlled by the fault and magmatic rocks.By isotopic analysis, sulfur isotope’s Characteristic is riching δ34S‰, and is small in range, it illustrates the high degree of homogenization of sulfur. The results of hydrogenand oxygen isotopes show Ore-forming fluid source of this deposit is magmatic waterin early stage, and precipitation is Entering at the Mid-mineralization, Fluid is mainlyMixed hydrothermal of precipitation and magmatic water.The study of fluid inclusions in quartz show, Forming temperature of this depositis mainly concentrated in the220to340℃. Among these, Homogenization temperatureof CO₂-bearing three-phase inclusions is higher than gas-liquid two-phaseinclusions,and is concentrated in the280to340℃.And the results of salinity anddensity show, the characteristics of Ore-forming fluid are low-density and low salinity.Fluid pressure range from49.34to78.53Mpa, and the mineralization depth of thisdeposit substantially range from5.70to7.22km. Therefore, I generally inferredShangzhuang gold doposit is middle temperature and middle-deep hydrothermal oredeposits.In summary, According to the research of the regional geology mine geology,geological characteristics and quartz fluid inclusions of the study area, we can knowShangzhuang gold deposit is the middle temperature and middle-deep alteration-typehydrothermal ore deposits, and the mineralization ager range from110to120Ma.