Determination of Diagenetic and Metallogenic Age and Their Significance in Dongxiang Copper Deposit, Northeast Jiangxi Province, China
Cai Yitao
Ni Pei
Wang Guoguang
Chen Hui
Zhang Jie
Abstract：The formation of the Dongxiang copper deposit has been hotly debated for the last 20 years.In particular,the origin of the Dongxiang Cu deposit was controversial,with models ranging from Hercynian SEDEX (sedimentary exhalative deposit)to Yanshanian magmatic hydrothermal origins.Accurate dating on the mineralization and associated igneous rocks is a key to solve this problem.Using Rb-Sr isochron method on quartz (fluid inclusions) samples from the massive sulfide ore,an ore formation age of 161.8±9.6 Ma (MSDW=1.3) was obtained.Intrusive rocks (i.e.,granodiorite-porphyry specially related to Cu ore-forming) in Dongxiang region was also studied.The zircon U-Pb ages are 164±2 Ma and 160±1 Ma for granodiorite porphyry.These results indicate that the metallogenic epoch of the Dongxiang copper deposit occurred in the Yanshanian.Combined with fluid inclusion results and regional metallogeny,it is proposed that the Dongxiang copper deposit was related to magmatic hydrothermal activities associated with the Yanshanian intrusive porphyries nearby.
Keywords：fluid inclusionRb-Sr isochron datinggeochronologymetallogenetic ageDongxiang Cu depositore deposits
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 1495-1507 )