| Citation: | Jun Zhong, Mark Mihalasky, Michel Cuney, Sheng He, Jun-Jie Li. Unraveling the Hydrothermal History of the Xinshuijing Na-Metasomatite Uranium Deposit in the Longshoushan Metallogenic Belt, Northwest China by Coupled Hydrothermal Zircon U-Pb and Albite Ar-Ar Dating. Journal of Earth Science, 2026, 37(3): 1131-1151. doi: 10.1007/s12583-024-0081-5 |
Na-metasomatite uranium deposits are an important type of large-tonnage low-grade uranium deposit. They are characterized by an intimate association between uranium minerals and albite, and by the common development of syn-ore hydrothermal zircons. Similar to other types of uranium deposits, constraining an accurate age of mineralization remains a challenge for the Na-metasomatite type ones. In this study, we present for the first time, an approach that combines age dating results from the syn-ore albites (40Ar-39Ar) and hydrothermal zircons (U-Pb) for a typical Na-metasomatite uranium deposit, the Xinshuijing deposit in the Longshoushan metallogenic belt of Northwest China. The hydrothermal zircon U-Pb and albite 40Ar-39Ar ages are consistent with each other (378‒366 Ma; within error), but also identical to the previously reported uraninite chemical U-Pb ages (approximately 370 Ma). The coupled application of hydrothermal zircon U-Pb and albite 40Ar-39Ar age dating is thus regarded as a robust approach for constraining the age of mineralization for Na-metasomatite uranium deposits. An age gap of approximately 70 Myr between uranium mineralization (~ 370 Ma) and host granitoid emplacement (about 440 Ma) suggests no direct genetic linkage between the two. Further exploration in the surrounding metamorphic units is therefore suggested, rather than only focusing on the host granitoids, especially where intensive wallrock alteration and structural features are pervasive. The varied hydrothermal zircon δ18O isotope compositions are attributed to the significant fluid-wallrock interaction during the uranium mineralization, which is consistent with our previous fluid inclusion and geochemical studies. Our study highlights the importance of selecting appropriate isotopic dating methods, which is informed by detailed paragenetic and geochemical analysis of dateable minerals formed before or coeval to the main-stage uranium mineralization. Moreover, it is underlined that the exact ore-forming age determination is of great significance since it sheds light on the ore genesis and provides valid constraints on the ore-controlling factors during further exploration.
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