Characteristics and Mineralization Epoches of the Bairong Porphyry Copper Molybdenum Deposit in the Nyemo County,Tibet

The Bairong copper molybdenum deposit,occurring in the middle of the Gangdise Mountains,is a middle size deposit in the Nyemo County of Tibet.The Bairong copper molybdenum deposit is hosted by biotite adamellite porphyry and dacite porphyry,which intrusived in the Himalayan period.Ore-bearing rock body is a complex massif and the invasion sequence can be divided into biotite adamellite porphyry→dacite porphyry→granite porphyry according to petrography and characteristics of the deposit.The mineralization epoches can be divided into magmatic period,hydrothermal period and supergene period.The average value ofδ34S of pyrite in the ore is 0.15‰,very close to zero indicating that S was from the mantle.The Bairong deposit is a post collision porphyry copper molybdenum deposit.This geological characteristics and mineralization epoches study has guiding significance for prospecting.