The New Progress in the Study of Mesozoic Rhyolite-Trachyte Assemblage and Hydrothermal-type Uranium Mineralization in Eastern China |
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Authors: | Wu Jianhua Xie Kairui Wu Rengui Guo Guolin Liu Shuai |
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Institution: | 1.State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China Institute of Technology, Nanchang 330013, China; 2.College of Earth Science, East China Institute of Technology, Nanchang 330013, China |
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Abstract: | The most intense area of Mesozoic volcanism and main region of hydrothermal-type uranium deposits is located in Eastern China. From the northern to the southern part, it can be divided into seven volcanic belts of Great Xing’an Range, Lesser Xing’an-Zhangguangcai Ranges, Northern Hebei-Western Liaoning, the Lower Yangtze Region, Ganhang areas, Wuyi Mountain areas,the Southeast Coastal areas, five uranium metallogenic belts of Guyuan-Hongshanzi, Qinglong-Xingcheng, Luzong-Qixia, Ganhang, Wuyi Mountain, and Three uranium metallogenic perspective belts of Manzhouli-Erguna, Zhalantun, Yichun. The volcanism of all these volcanic belts can be subdivided into six stages: The Early Jurassic to early Middle Jurassic, late Middle Jurassic to early Late Jurassic, early Early Cretaceous, middle Early Cretaceous, late Early Cretaceous and early Late Cretaceous. High-K calc-alkaline rhyolite-alkali trachyte rock assemblage of the early Early Cretaceous has a close connection with the explored uranium deposits. High-K calc-alkaline rhyolites have high content of uranium, and can provide the epithermal ore forming system with uranium; Alkali trachyte associated with mantle-derived magmatism can provide alkaline ore-forming fluid of rich uranium for deep temperature mineralizing system or act as pioneers of alkaline ore-forming fluid of rich uranium. |
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Keywords: | Rhyolite-trachyte assemblage Hydrothermal-type uranium deposits Eastern China Early Early Cretaceous |
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