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Geochronology and geochemistry of the ore-bearing porphyry in Qulong Cu(Mo)ore deposit,Tibet.

WANG LiangLiang MO XuanXue~(**) LI Bing DONG GuoChen ZHAO ZhiDan 1.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China 2.School of Earth Science and Mineral Resources,China University of Geosciences,Beijing 100083,China  
The discovery and further study of the Gangdese porphyry copper ore deposit belt in Lhasa block,Tibetan plateau,is one of the most attractive findings in the ore exploration in Tibet in the past 5 years.It has potential of being a giant copper and polymetallic ore-forming belt in the future.Study on the belt is still under going now.Qulong porphyry Cu(Mo)ore deposit is located in eastern part of the belt and only a small amount works has been performed.This mostly attributes to its inconvenient condition for field work in Qulong region.New geochemical studies and isotopic dating results on the ore-beating granodiorites were presented in this paper. On the basis of detailed field work and geochemical study,SHRIMP zircon U-Pb method and Re-Os dating of molybdenites method were used for determining the rock-forming and ore-forming ages.Analysis of two SHRIMP zircon U-Pb ages(16.35±0.40Ma and 16.38±0.46Ma)and four Re-Os model age of molybdenites(15.82-16.85Ma)sampled in the drilling core of ZK003 in Qulong ore deposit were carried out.Data in this paper are very close to the other published data,further supporting the conclusion that the rock- forming and ore-forming processes are continuously in Qulong ore deposit,which lasting for a short period of less than approximately 1Ma.The time for ore-forming in Gangdese porphyry copper ore deposit belt range from 12 to 17Ma,lasting for about 5Ma.
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