Research On The Geological Characteristics And Genesis Of The Dulongbao Mo Deposit In Ejin Banner,Inner Mongolia

This paper is based on the project of "Etailed exploration of Dulongbao Mo Deposit in Inner Mongolia,Ejin Banner",which is the Inner Mongolia bureau of geology mineral owned Mineral Rights Exploration Project,and the Mo deposit has been discovered by Inner Mongolia bureau of geology mineral.Dulongbao Mo Deposit lies in Ejin-Yagan metallogenic belt northern part of the Beishan metallogenic belt,which is belong to “Tianshuijing-Wuzhuergashun Au?Cu and Fe minerogenetic pro spect province”.All Mo ore body discovered are concealed ore body,they are located in plagioclase granite porphyry and quartz-monzonite in Permian Period and controlled by primary joint.The ore body is generally divided into upper and lower layers in the depth of burial.The upper orebody inclines to the north east(Compared with porphyry rock mass,it inclines inwards),pitchs to south east.The lower orebody inclines to the south west(Compared with plagioclase granite porphyry body,it inclines outwards),pitchs to north west.The main ore minerals are molybdenite,chalcopyrite and bornite.Molybdenum ore structure is dominated by interstitial vein,disseminated and brecciated structures,and ore structure is dominated by leaf-like and self-form and semi-self grain-like structures.Wall rock alteration zoning related to mineralization is obvious.From porphyry to peripheral quartz monzonite,Alteration zoning is roughly as follows: Pyritization ? chloritization ? Potassium ? Silicization alteration?Pyritization ?biotitization ? tourmaline ? sericitization alteration?Pyritization ? epidotization ?biotite alteration.Each alteration zone is overlapped with each other.Mineralization of the deposit can be divided into four stages: quartz-pyrite stage,quartz-tourmaline stage,quartz-molybdenite-chalcopyrite stage and quartz-calcite stage.Deep part of hydrothermal porphyry rich in ore-forming materials,due to internal pressure and tectonic activities,the burst occurred,forming two groups of conjugate close and narrow fracture structures near the porphyry body,The mineralizatic hydrothermal solution filled with crystals along fissures and infiltrated and metasomatized,forming dense ore-bearing veinlets and forming numerous ore bodies.Based on the above characteristics,it is considered that the dulongbao molybdenum deposit is a typical porphyry molybdenum deposit.