Zircon U-Pb Age and Geochemical Characteristics of Granitic Magmatic Rocks in Mailong Gold Deposit,East Kunlun,and Their Geological Significance
Yu Xiaoliang
Li Hua
Wei Xiaolin
Zhang Huiqing
Li Jie
Gu Chao
Tong Haikui
Chen Huayong
Xiao Bing
Wang Hao
Zhang Binshun
Abstract：To reveal the tectonic evolution of the Proto-Tethys and Paleo-Tethys Oceans and their genetic links to gold-polymetallic mineralization in the East Kunlun orogenic belt(EKOB),this study conducted petrographic,geochemical,and LA-ICP-MS zircon U-Pb geochronological analyses on monzogranite and granodiorite from the Mailong gold deposit.The results show that the monzogranite and granodiorite crystallized at 421±11 Ma(Late Silurian)and 228±4 Ma(Late Triassic),respectively,exhibiting metaluminous,high-potassium calc-alkaline characteristics.Trace element analyses reveal enrichment in light rare earth elements(LREE),large-ion lithophile elements(LILE:Rb,K),and incompatible elements(U,Th,Pb),with depletion in high-field-strength elements(HFSE:Nb,Ta,P,Ti)and weak negative Eu anomalies,indicating an island arc granite affinity.Combined with regional geological evidence,these rocks formed through crust-mantle interaction during the post-orogenic extensional stage.The Mailong gold deposit,primarily hosted in the granodiorite,is likely associated with tectonic-magmatic activities during the post-orogenic extension of the Paleo-Tethys evolution.This study provides critical age constraints and geochemical insights into the tectonic evolution and gold mineralization in the EKOB,offering valuable guidance for regional mineral exploration.
Keywords：East Kunlun orogenic beltU-Pb datinggeochemistrymonzogranitegranodioritepetrology
Publication Date：2025-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：17( 2107-2123 )