The Study Of Geologic Relation Of Bolong And Duobuza Cu-Au Deposit In Tibet

Duolong ore concentration area are located in the west of Bangong Lake-Nujiang Metallogenic Belt,which has good metallogenic conditions through complicated tectonic magmatic event.Many ore deposits have been discovered in DuoLong ore concentration area such as Duobuza?Bolong?Rongna?Naruo.The highest research degree deposits are Duobuza and Bolong deposit which are the most representative of those deposits.The subject of study Established on the geology relationship between Bolong deposit and Duobuza deposit is based on high exploration degree,large deposits in reserves,close range between Bolong deposit and Duobuza deposit.The Subject mainly explores orebody spatial relationships,metallogenic time,the source material and so on to prove the relations between the two deposits,analyze prospecting and exploration direction,explore metallogenetic characteristics of porphyry copper deposit in Duolong ore concentration area to guide the prospecting area.In a word,Bolong deposit and Duobuza deposit are located in the central of the Duolong ore concentration area.the Orebodies are contraled by Joint of the axis of fold fracture zone and level.Orebody formation is related to the rock formation in two deposits.the rock formation in Bolong deposit is looked like pole and the other in Duobuza deposit is like tabular body.The elevation of Bolong orebody is mainly from 4750 m to 4900 m,and that of Duobuza orebody from 4750 m to 5000 m,therefore concluded that the orebodys are unlikely to be linked together in the deep.Duobuza and Bolong mineralized porphyry is peraluminous-calc-alkaline granite series.They both share the characteristics of the island arc magma.Fluids are mixed with the magma and meteoric water in two deposit.S isotope studies have shown that sulfur displays characteristics of mantle source and mixed source derived.In two deposits,metallogenic materials may come from the upper mantle source and also has characteristics of mixed lead in orogenic belt.The source region may be metasomatized by melt of subducted sediment.Integrated geological characteristics,the rock geochemical characteristics and Orebody formations have shown that both copper-gold deposits are formed in the early Cretaceous subduction tectonics background.The ore-bearing porphyries and ore-forming materials came from a unified source area but followed are separated into two porphyries near the surface and mineralized bodies by transmitting ore structure and depositing ore structure.