Geological Characteristics And Genesis Of Pb-Zn-Ag Deposits Of The ? Mineralization Section In Huoluotai Area ?,mohe County,Heilongjiang Province

The study area is located in ? — 47—1—1 Fukeshan — huoluotai Au Cu Mo ore concentration area.Lead zinc mineralization is mainly developed along the interlaminar(gneissic)fracture zone of gneiss of Xinghua formation in huoluotai II area.Sericitization and silicification are closely related to mineralization space.Sulfides are distributed in quartz veinlets in vein and agglomerate form,and some in altered rocks in disseminated form.As of December 2018,5 lead zinc silver arsenic ore bodies(2 industrial ore bodies and 3 low—grade ore bodies)have been delineated in the study area.A group of veins are distributed in NW direction,with small extension of single vein,and the overall scale of this kind of mineralization is small.Vein lead—zinc deposits are characterized by alteration and mineralization of the shallow and peripheral porphyry copper molybdenum deposits.Analytic data of primary halo samples showed that Cu,Zn,Pb and Ag were closely related,the test of electron probe indicated that main metal sulfides exhibit typical magmatic hydrothermal characteristics.It is found that the phase state of fluid inclusions is gas—liquid two—phase and pure gas phase inclusions,the fluid homogenization temperature is 273—134 ° C,and the salinity is 3.05—13.4 wt.% NaCl equ;combined with s and Pb isotopic analysis,the ore—forming material mainly comes from the stratum,combined with H—O isotopic analysis,the ore—forming fluid mainly comes from the mixture of rock slurry water and atmospheric water.08hs—5 geochemical exploration anomaly area is large,and the anomaly intensity is weak,but the element zoning is obvious.Cu,Mo are distributed in the inner zone,Pb,Zn and Sb are distributed in the outer zone.The geochemical exploration anomaly and mineralization area are mainly weak positive magnetic anomaly or weak negative anomaly.The study area is characterized by porphyry mineralization of shallow and lateral hydrothermal vein type,mainly composed of several lead—zinc(silver)veins distributed in lateral rows,single vein with small extension,consisting of ore—bearing quartz —(carbonate)vein.The surrounding rock near the mine mainly develops sericitization and carbonation,locally appears potassization,and generally shows the characteristics of medium and low temperature vein type mineralization.Porphyry type mineralization should exist in the deep part,In this area,there is potential to find small silver lead zinc deposits.