Research On Metallogenic Characteristics And Genesis Of Huangyakou Lead-Zinc Deposit In Yuzhong County,Gansu

The thesis is based on the “Shangdan-Dachaidan Area Regional Geological Survey”secondary project undertaken by the Xi'an Geological Survey Center of China Geological Survey,including "Three Special Geological Surveys of Xicha Sheet(J48E021008),Shuichuan Sheet(J48E022009),and Beiwan Sheet(I48E022010)in the Baiyin Area of Gansu Province".On the basis of previous work,research is carried out on the metallogenic characteristics,metallogenic age,metallogenic structure environment,deposit genesis and other aspects of the Huangyakou lead-zinc deposit in the periphery of the Baiyin ore field,providing a basis for a breakthrough in prospecting in the periphery of the Baiyin ore field The data,combined with geophysical data,provide a basis for the division of the eastern boundary of the northern and central Qilian structures.The main conclusions are as follows:1.Determine that the ore-bearing rock series of the Huangyakou lead-zinc deposit is a set of bimodal volcanic rock series,which is obviously controlled by the volcanic structure,and the wall rock alteration has obvious horizontal zoning.The genetic type of the deposit is a massive sulfide deposit(VMS)related to marine volcanic rocks.2.The metallogenic process of the Huangyakou lead-zinc deposit has multiple stages and multiple stages,mainly including the magma hydrothermal period and the epigenetic oxidation period.The magma hydrothermal period consists of the pyrite-quartz stage(I)and the pyrite-Sphalerite-galena-chalcopyrite stage(II)and pyrite-iron dolomite stage(III)composition.3.The age of metarhyolite closely related to mineralization is 507.6±1.8Ma-504.6±2.8Ma,which can approximately represent the metallogenic age of the Huangyakou lead-zinc deposit.Combined with the geochemical study of ore-bearing surrounding rocks,it is believed that the Huangyakou lead-zinc deposit was formed in the Mid-Late Cambrian continental rift environment.4.The prospecting signs of the Huangyakou lead-zinc deposit were summarized,a metallogenic model was established,and two prospecting prediction areas,the deep part of the Huangyakou lead-zinc deposit(?)and the northwest of Huangyamiao(?),were initially proposed.