Diagenetic-Metallogenic Age and Mineralization Potential of Longsang Porphyry Cu-Mo Deposit,Gongbu Jiangda County,Xizang
Wu Changyi
Lang Xinghai
Deng Yulin
Zhan Hongyu
Wang Xuhui
Li Chen
Zheng Hongshan
Gao Huanli
He Qing
Feng Dexin
Guo Baiqing
Abstract：The Longsang deposit is a porphyry copper-molybdenum mining area where mineral exploration is currently underway in the eastern section of the Gangdese metallogenic belt.To further constrain the magmatic-mineralization age and evaluate the metallogenic potential of the ore-bearing intrusions,detailed field geological surveys,and drill core logging were conducted,and zircon U-Pb dating and trace element analysis were performed on the mineralized rock bodies of biotite granodiorite and biotite monzogranite porphyry,with Re-Os dating of molybdenite veins in this study.The results indicate that the ore-bearing intrusions in the Longsang deposit are of crystallization ages of(21.80±0.29)Ma and(21.68±0.23)Ma,while the molybdenite mineralization age is(19.1±0.6)Ma.Additionally,zircon trace elements exhibit high Ce/Nd,(Ce/Nd)/Y,and low Dy/Yb ratios,along with negative Eu anomalies and positive Ce anomalies,indicating that the magma had high oxygen fugacity and water content,which facilitated the enrichment and transport of ore-forming elements such as Cu and Mo.In conclusion,the Longsang deposit underwent diagenetic mineralization during the Miocene epoch,demonstrating significant mineralization potential.These findings provide valuable insights into the spatiotemporal distribution patterns of deposits in the eastern Gangdese belt,contributing to a deeper understanding of regional metallogeny.
Keywords：Gangdeseporphyry copper molybdenum depositsLongsang depositdiagenetic and metallogenic agemetallogenic potentialore depositsgeochemistry
Publication Date：2025-11-30
Online Publishing Date：2025-12-15(First online date of this platform, not the publication date of the document)
Pages：18( 4337-4354 )