Relationship between magmatic activity of Zangmaxikong and the metallogenesis of Cu-Ag deposit in the north of Tanggula Mountain,Qinghai,China

The Zangmaxikong Cu-Ag deposit is in Tanggula Mountain of Qinghai.The total REE of the Himalayan porphyry mass is high with a high ratio of LREE to HREE(between 10.87 and 14.23).This represents that the porphyry mass was formed by the partial melt of lower crust.The age of the porphyry mass is 38 Ma.It belongs to post-orogeny akali-granite.The metallogenesis of the deposit has a close relation with the porphyry mass.The porphyry mass is rich in Pb,Zn,Ag,Mo and Cu,so,it which provides ore-forming materials for the metallogenesis.The metallogenetic epoch of the deposit is later than both the Late Cretaceous Fenghuoshan Group and the intrusion of the porphyry mass.Affected by the porphyry mass,the ore-forming elements become richer with depth.