| Xiari Gayin Gaotu lead-zinc deposit in East Ujimqin Banner of Inner Mongolia is located in the composite region of paleasia metallogenic domain and binhai western Pacific metallogenic domain,the middle section of daxinganling,hualixi,yanshan iron,zinc,tungsten,gold,lead mineralization belt,mesozoic volcanic rocks and tectonic traces are widely distributed in the area,it is very favorable for mineralization.This paper analyzes and studies the geological characteristics,geophysical characteristics,geochemical characteristics and prospecting marks of the lead,zinc and silver polymetallic deposit in the Xiari Gayin Gaotu area,the following conclusions are drawn about the lead-zn-ag polymetallic deposit in the Xiari Gayin Gaotu area.(1)The occurrence of pb zn ag polymetallic deposits in the Xiari Gayin Gaotu area is mainly in the upper Jurassic manitu formation,the ore-bearing lithology is mainly lithic crystal-clastic glass-clastic tuff,alteration and development of surrounding rock in mining area,it is mainly of medium and low temperature hydrothermal alteration type.Epidotization,pyritization and limonization are developed in the summer gaeyingtu mining area.(2)Ore bodies occur mainly in structures controlled by nw-se trending fault structures,show long vein shape more,resemble layer shape to wait,In general,it is north-west-southeast,controlled by structure.At present,12 lead,zinc and silver ore bodies have been found in the mining area,diversity of ore types,the ore structure mainly includes disseminated structure,vein structure and block structure;the ore structure mainly includes semi-automorphic-automorphic structure,solid solution separation structure,metasomatism structure and so on.Ore minerals are mainly pyrite,sphalerite,chalcopyrite,molybdenum,arsenopyrite,galena,chalcopyrite and so on.Gangue minerals are sericite,epidotite and so on.(3)Through the geological characteristics of the ore body and comprehensive study of all aspects,it is determined that the upper Jurassic manitu formation provides a certain material source for the polymetallic mineralization of lead,zinc and silver in the Xiari Gayin Gaotu area;Fault structure provides a channel for ore-bearing hydrothermal transport and a place for ore body formation;to control the location,occurrence,morphology and scale of the deposit.(4)Through comprehensive analysis of metallogenetic geological information,preliminary determination of the area's most advantageous prospecting signs.Lithic crystal-clastic vitrite tuff is a direct prospecting indicator in the upper Jurassic manitou formation,Epidotization,pyritization,limonization and other alterations,the physical characteristics of the area are low resistivity and high polarizability,there are obvious anomalies in geochemical exploration assemblage of surface rocks,it can be used as a sign of indirect prospecting. |
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