EMPA Chemical U-Th-Pb Dating of Uraninite in Ziyunshan Granite, Centre Jiangxi Province
Tang Ao
Li Guanglai
Su Ye
Guo Guolin
Wei Xinglin
Liu Zhenyu
Chen Guangxu
Abstract：The Ziyunshan peraluminous granite, located in central Jiangxi Province is closely related to uranium and tungsten mineralization.In order to obtain the accurate age of this granite, the electron microscope, SEM and EMPA were firstly used to study uraninites in the Ziyunshan granite in this study.Results show that most of the uraninites are wrapped in biotite or muscovitized biotite, and only one is surrounded by pyrite.Some uraninite grains have been fractured or altered, which indicates uraninite is one of the most important uranium source minerals of granite type uranium deposits in this area.Five uraninite grains electron microprobe U-Th-Pb dating results in the Jiaokeng unit (J3J) are between 154.5Ma and 168.9Ma, the weighted average age is 161.8±2.4Ma (MSWD=0.26, n=26).Chemical ages of three uraninite grains in the Miaoqian unit (J3M) are between 152.8Ma and 164.7Ma, the weighted average age is 159.7±3.2Ma(MSWD=0.2, n=15).Chemical ages obtained here are very consistent with W-bearing granites in the South China.It is confirmed that uraninite EMPA chemical dating is a suitable method for U-fertile peraluminous granites.
Keywords：uraniniteuranium-source mineralsEMPA chemical datingZiyunshan granitecentral Jiangxi Provincemineralogy
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：11( 378-388 )