Diagenesis,Lithogenesis and Geodynamic Setting of Intrusions in Senadong Area,Duolong District,Tibet
Wang Qin
Lin Bin
Tang Juxing
Song Yang
Li Yanbo
Hou Junfu
Li Yubin
Wei Lujie
Abstract：Duolong district has more than 20 million tons of copper resources,which is the top large-scale Cu-Au mineral dis-trict in China.However,the prospecting potential in its peripheral region is still huge.This paper reports the geochronology and geochemical test results of the granite porphyry and diorite porphyry in the Senadong area for the first time,providing data for regional metallogenic regularity.In this study,the accurate zircon isotopic dating,Hf isotopic and whole rock major and trace elements reveal that emplacement ages of granitic and dioritic porphyries 123±2 Ma,respectively;the formation of rocks is related to partial melting of subducted oceanic plate,and the magma contains significant mantle source component.Based on these results,it is proposed that the intrusions of the Senadong area adjacent to ore-bearing porphyry in Duolong district formed during the period of the Early Cretaceous magmatic activity,suggesting that they possibly have the same geodynamic back-ground.All these intrusions are the products of Bangongco-Nujiang ocean arc-arc"soft"collision,which occurred in the end of subduction transform to the beginning of the collision.These magmas provide heat and fluid for mineralization,which suggests that the Senadong area could be a potential district to find the new porphyry deposits.
Keywords：U-Pb dating of zirconpetrologygeochemistryHf isotopeSenadongTibet
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：17( 1125-1141 )