Geological Characteristics And Genesis Of Pb-Zn Deposit In Upper Reaches Of Xiagalaiaoyi River In Heilongjiang Province

Pb-Zn Deposit in Upper Reaches of Xiagalaiaoyi River is located in the western part of the intersection of The southern margin of Emuer mountain uplift belt and the northern edge volcanic belt of Daxinganling mountains.The strata of the studied area mainly are Middle Proterozoic Xinghuadukou group,Upper Proterozoic and lower Cambrian wolegen group complex,intrusive rocks mainly are early Cambrian granites,grain granodiorite,and early Cretaceous fine-grained granite,granite porphyry,diorite,plagiogranite,followed by monzonitic granite.The orebody mining area is mainly marble and marble wolegen group complex auspicious groove rock group and intrusive contact zone,Formed by magma and its effect of gas-liquid contact zone and contact metasolatic marble in metamorphic rocks are the main ore hosting horizon.Skarn is the main ore bearing rock in the mining area.Silicification,epidotization,chloritization,sericitization.carbonation,pyritization,limonitization are more developed in a variety of rocks.Flash petrochemical,actinolitizationare are closely related to slate,hornfels,and metamorphic skarn.The mainly structural in the mining area are folds,mylonitic zone,volcano tectonie fracture.The fold in the central area is the main controlling structure.The comprehensive exploration of geology,geophysical and geochemical exploration were carried out in the lead-zinc Polymetallic Deposit in Upper Reaches of Xiagalaiaoyi River.A total investment of 31959m3 trenching,23170.27m drillingand and various sampling test work are finished.Through the exploration,22 iron orebodies,32Lead-zinc ore bodies,14 molybdenum ore bodies are found,The minimum length is 25m,the maximum length is 300m.Lead + zinc grade is 6.03%,average thickness is 5-7.79m.The ore type is magnetite ore,lead-zinc ore,molybdenum ore.According to the washability test,the iron ore is easy to choose,The grade of iron concentrate is 67.4%,the recovery rate of iron is about 85.85%,the grade of lead concentrate is 62.25%,the recovery rate is about 92.76%,the grade of zinc concentrate is about 50.58%,and the recovery rate is about 91.93%;The above results indicate that the area has good metallogenic geological conditions.In this paper,through the pre survey,census work summary and together with the characteristics of regional geology and mineral resources,geological conditions,geochemistry and geophysics are comprehensively analyzed,The geological characteristics of the lead-zinc Polymetallic Deposit in Upper Reaches of Xiagalaiaoyi River are summarized.The genetic types and metallogenic conditions of the deposit are discussed and summarized in order to provide guidance for the next step.