Granite-type uranium deposits in the eastern part the Guidong granitic pluton, a multi-period and multi-phase composite pluton consisting mainly of Indosinian and Yanshanian (Jurassic) granites. The ore field area is dominated by Yanshanian intrusions: Xiazhuang, an Early Jurassic peraluminous medium-grained two-mica granite (196 Ma) in the east; Luxi, a Middle Jurassic coarse-grained porphyritic biotite granite (185 Ma) in the southeast; and Aizi, a Late Jurassic medium-grained hornblende-biotite granite (157 Ma) in the west. Volcanism in the Late Jurassic-Early Cretaceous (143 Ma) produced granular and felsic porphyroclastic lavas and pyroclastic sediments. Later felsic intrusions (143-125 Ma) include small granite stocks and pegmatite and aplite dykes; the latter are ubiquitous in the area, but concentrate around late granite stocks. During the Late Cretaceous, the eastern granite segment (Xiazhuang) was uplifted and exposed to erosion before it subsided again. This block, which hosts the ore field, is limited to the north and south by two ENE-WSW trending, silicified fault zones. Litho-structural elements in the ore field include diabase dyke swarms, NNE-SSW, ESE-WNW and ENE-WSW trending silicified fracture zones, and two giant ENE-WSW trending quartz veins. Host rocks include various granites and intermediate to mafic dykes. Most of the ore bodies are blind, but some crop out at the surface.
References
- Li Tiangang and Huang Zhizhang (1986): Vein uranium deposits in granites of Xiazhuang ore field. In: Fuchs, H. (Ed.): Vein Type Uranium Deposits. Int. At. Energ. Agency, IAEA-TECDOC-361, pp. 359-376.
- Jingyi Zhang, Anwa Wan, and Wenshu Gong (1992): New data on yingjiangite. Acta Petrologica et Mineralogica 11(2), 178-184 (in Chinese with English abstract).
- Dazhong Xu, Linqing Liu, and Baoqun Hu (1999): Study of pneumato-hydrothermal high temperature uranium metallogenic characteristics and uranium metallogenic ages in Xiazhuang uranium ore field. Uranium Geology 15(5).
- Zhanshi Zhang, Renmin Hua, Ping Deng, Ba Zhu, Lieqin Wu, Yanchun Zhang, Zhengzhong Tan, and Zhengping Yin (2005): Geological and Geochemical Characteristics of water-rock Interaction in the Processes of Uranium Mineralization in Zhuguang-Xiazhuang Uranium ore-concentrated District. Geochimica 34(5), 483-494 (in Chinese with English abstract).
- Sun Zhanxue (2005): Gas geochemistry of ore-forming solution in the Xiazhuang U-ore-field, North Guangdong, China. Goldschmidt Conference Abstracts, A850.
- Zhang Min, Chen Peirong, and Chen Weifeng (2006): Uranium metallogenic characteristics and discussion on metallogenic setting of uranium plutons in northern Guangdong Province. Geology of Chemical Minerals 28(1), 9-14.
- Long Lu, Fanrong Chen, and Rucheng Wang (2006): The Compositional Characteristic of Uranyl Minerals in Xiazhuang Uranium Ore Field: Insight for the Oxidation Behavior of UO2 in Nuclear Waste Repository. Geological Review 71(4), 562-569.
- Long Lu, Fanrong Chen, R.C. Ewing, and Rucheng Wang (2007): Trace element immobilization by uranyl minerals in granite-hosted uranium ores: Evidences from the Xiazhuang ore field of Guangdong province, China. Radiochimica Acta 95(1), 25-32.
- Dahlkamp, F.J. (2009): Uranium Deposits of the World. Springer (Berlin, Heidelberg), pp. 31-156.
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