HU Huan1, WANG Ru-cheng1, CHEN Wei-feng1, DING Hai-hong2,
LING Hong-fei1, CHEN Pei-rong1, LIU Guo-ning1
(1. State Key Laboratory for Mineral Deposits Research, School of Earth Science and Engineering, Nanjing University, Nanjing 210093, China;
2. Institute of Resource Survey and Assessment, East China Mineral Exploration and Development Bureau, Nanjing 210007, China)
Abstract: Xiangchaoping granite and Douzhashan granite are Indosinian granitoids located in the Miaoershan uranium orefield. They have the same tectonic setting and homologous spatial association. However, Douzhashan granite is uranium-bearing granite with many uranium deposits, while Xiangchaoping granite is a granite in which no uranium deposits occur. Biotite from Douzhashan granite is characterized by greater alteration, higher Al2O3, FeO and F content, lower TiO2 and MgO content, lower formation temperature and oxygen fugacity. Higher F content and lower oxygen fugacity contribute to the uranium enrichment in granite and the formation of uranium-bearing minerals, as well as providing metallogenic material during late stage uranium hydrothermal mineralization. This is the main reason for many uranium deposits within the Douzhashan granite but with different uranium mineralization characteristics, whereas there is no uranium ore in the Xiangchaoping granite.
Key words: biotite; Xiangchaoping granite; Douzhashan granite; Uranium mineralization
ACTA MINERALOGICA SINICA Vol. 34, No. 3, 2014, Page 321-327
