Uraninite from the Guangshigou Pegmatite-Type Uranium Deposit in the North Qinling Orogen, Central China: Its Occurrence, Alteration and Implications for Post-Caledonian Uranium Circulation
Abstract
:1. Introduction
2. Geological Setting
3. Sampling and Analytical Methods
3.1. Mineral Analysis and Characteristic X-ray Element Mapping by EPMA
3.2. U-Th-Pb Chemical Age Determination on Uraninite, Coffinite and Uranothorite by EPMA
3.3. Nanoscale Observations of Uraninite Alteration by TEM
4. Results
4.1. Petrography of the Guangshigou Biotite Pegmatites
4.2. Mineralogy of Non-Altered Uraninite
4.3. Mineralogy of Magmatic Biotite
4.4. Alteration of Uraninite and Mineralogy of Radiohalos
4.4.1. Uraninite Alteration and Element Redistributions
4.4.2. Mineralogy of Radiohalos Around Uraninite
4.5. U-Th-Pb Chemical Age Determination of Uraninite, Coffinite and Uranothorite
5. Discussion
5.1. Timing of Uranium Mineralization and Post-Crystallization Alteration in the Guangshigou Biotite Pegmatite
5.2. Processes Responsible for Uraninite Alteration and Radiohalo Formation
5.3. An Integrated Model for the Guangshigou Uraninite Alteration and Its Implications for Uranium Circulation in the Qinling Orogenic Belt
6. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Wu, B.; Bonnetti, C.; Liu, Y.; Zhang, Z.-S.; Guo, G.-L.; Li, G.-L.; Hu, Y.-Q.; Yan, Z.-Y. Uraninite from the Guangshigou Pegmatite-Type Uranium Deposit in the North Qinling Orogen, Central China: Its Occurrence, Alteration and Implications for Post-Caledonian Uranium Circulation. Minerals 2021, 11, 729. https://doi.org/10.3390/min11070729
Wu B, Bonnetti C, Liu Y, Zhang Z-S, Guo G-L, Li G-L, Hu Y-Q, Yan Z-Y. Uraninite from the Guangshigou Pegmatite-Type Uranium Deposit in the North Qinling Orogen, Central China: Its Occurrence, Alteration and Implications for Post-Caledonian Uranium Circulation. Minerals. 2021; 11(7):729. https://doi.org/10.3390/min11070729
Chicago/Turabian StyleWu, Bin, Christophe Bonnetti, Yue Liu, Zhan-Shi Zhang, Guo-Lin Guo, Guang-Lai Li, Yin-Qiu Hu, and Zhao-Yan Yan. 2021. "Uraninite from the Guangshigou Pegmatite-Type Uranium Deposit in the North Qinling Orogen, Central China: Its Occurrence, Alteration and Implications for Post-Caledonian Uranium Circulation" Minerals 11, no. 7: 729. https://doi.org/10.3390/min11070729