Timing of uranium mineralization and geological implications of Shazijiang Granite-Hosted uranium deposit in Guangxi, South China: New constraint from chemical U-Pb age

Jincheng Luo; Ruizhong Hu; Shaohua Shi

doi:10.1007/s12583-015-0542-y

Volume 26 Issue 6

Nov 2015

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Journal of Earth Science > 2015 > 26(6): 911-919.

Jincheng Luo, Ruizhong Hu, Shaohua Shi. Timing of uranium mineralization and geological implications of Shazijiang Granite-Hosted uranium deposit in Guangxi, South China: New constraint from chemical U-Pb age. Journal of Earth Science, 2015, 26(6): 911-919. doi: 10.1007/s12583-015-0542-y

Citation:

Jincheng Luo, Ruizhong Hu, Shaohua Shi. Timing of uranium mineralization and geological implications of Shazijiang Granite-Hosted uranium deposit in Guangxi, South China: New constraint from chemical U-Pb age. Journal of Earth Science, 2015, 26(6): 911-919. doi: 10.1007/s12583-015-0542-y

Citation:

Jincheng Luo, Ruizhong Hu, Shaohua Shi. Timing of uranium mineralization and geological implications of Shazijiang Granite-Hosted uranium deposit in Guangxi, South China: New constraint from chemical U-Pb age. Journal of Earth Science, 2015, 26(6): 911-919. doi: 10.1007/s12583-015-0542-y

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Timing of uranium mineralization and geological implications of Shazijiang Granite-Hosted uranium deposit in Guangxi, South China: New constraint from chemical U-Pb age

doi: 10.1007/s12583-015-0542-y

1.
State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Hunan Institute of Geological Survey, Changsha 410116, China

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Corresponding author: Jincheng Luo, luojincheng027@126.com
Received Date: 02 Mar 2015
Accepted Date: 12 Jul 2015
Publish Date: 01 Dec 2015

Abstract

Abstract

Miaoershan (MES) uranium ore field is one of the most important uranium sources in China, hosts the largest Chanziping carbonaceous-siliceous-pelitic rock type uranium deposit in South China together with many other granite-hosted uranium deposits. The Shazijiang (SZJ) uranium deposit is one of the representative granite-hosted uranium deposits in the MES uranium ore field, situated in the Ziyuan, Guangxi Province, South China. Uranium mineralization in the SZJ deposit mainly occurs as uraninite with quartz and calcite veins that is spatially associated with mafic dykes in the region. The hydrothermal alteration includes silicification, carbonation and hematitization. New uraninite chemical U-Pb geochronology and petrographic evidences provide the timing constraints and new insights into the formation of the SZJ uranium deposit. The results show that the first stage of uranium mineralization formed at 97.5±4.0 Ma, whereas another stage of uranium mineralization occurred at 70.2±1.6 Ma. Two stages of uranium mineralization are fairly consistent with two episodic crustal extensions that occurred at ~100 and ~70 Ma throughout South China. This study indicates that there are two uranium mineralization events in SZJ uranium ore field controlled by mafic dyke, supporting that mafic dykes play an important topochemical role in uranium concentration and/or mobilization. Therefore, geochemical U-Pb age firstly reinforces that ore-forming age of the SZJ uranium deposit mainly yields at 97.5±4.0 and 70.2±1.6 Ma. Additionally, geochemical age method is particularly useful for interest samples which record information on multi-stage uranium mineralizations in South China.
- Shazijiang uranium deposit,
- uraninite U-Pb age,
- EMPA,
- uranium mineralization,
- crustal extension,
- South China

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References(44)

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