Zhengqi Xu and 7 co-authors reported in 2021 that mega-crystalline uraninite (up to one centimeter in size) represents one of the most important discoveries in uranium mineralogy in the western margin of the Yangtze Block and even in China in recent years. However, the genesis of mega-crystalline uraninite remains controversial. In this study, the mega-crystalline uraninite found in the felsic and quartz veins in the Haita area is examined for the first time. The study examined the geochemical characteristics of uraninite in the two veins and resulted in two primary findings:
1) The genesis of the uraninite was likely intrusive and was closely related to partial melting, and
2) The quartz vein and feldspar vein are cogenetic and have a simple differentiation evolution relationship.
Therefore, the partial melting of felsic materials during migmatization may be the most important mechanism of uranium mineralization in the study area. Furthermore, further simple fractional crystallization may be another important mechanism for the formation of mega- crystalline uraninite. This study enriches the REE database of uraninite in uranium deposits worldwide, which is meaningful for studying the genesis of mega crystalline uraninite.
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