世界核地质科学2025，Vol.42Issue(2)：246-262,17.
银额盆地塔木素铀矿床富磷铀矿石的岩石矿物学、地球化学特征及成因探讨
Petrology,mineralogy,geochemistry and genesis discussion of phosphorus-rich uranium ores in the Tamusu uranium deposit,Yin'e basin
摘要
Abstract
This study focuses on the rare uranium mineralization phenomenon discovered in the Tamsu uranium deposit of Yin'e basin that part of uranium ores contain a large amount of apatite.The lithology,mineralogy,and geochemistry of these uranium ores were studied in detail by microscope,SEM,EMPA,XRD and analysis of major and trace elements,strontium isotope and bulk rock U-Pb isotope,its genesis was also discussed.The rock types associated with phosphorus-rich uranium ores include purplish-red dolomitic phosphorite,grayish-white dolomitic phosphorite,phosphorus-bearing siltstone,medium phosphatic sandstone,and brecciated limestone.The whole rock P2O5 content of the samples ranges from 0.42%to 27.74%.The primary phosphorus-containing mineral is apatite which occurs as microcrystalline apatite(about 0.5 μm)aggregate and accounts for up to 70%of the whole rock.These apatite were identified as carbonate-fluorapatite.Uranium content varies from 221×10-6 to 3 486×10-6 and show a significant positive correlation with P2O5 content,the rock's water bursting breccia structure,REE patterns,and lower Sr isotope values indicated the participation of hydrothermal deposition during apatite formation.Whole rock U-Pb isochron age of purplish-red phosphorite is 54±5.2 Ma,implying that the phosphorite suffered the alteration by the interlayer oxidation derived from the Zongnaishan uplift event around 60 Ma.In summary,the formation of phosphorus-rich uranium ores in the Tamsu area was the product of multiple geological processes including hydrothermal deposition and interlayer oxidation关键词
塔木素铀矿床/磷质岩/铀矿化/磷灰石/热水沉积Key words
Tamusu uranium deposit/phosphorite/uranium mineralization/apatite/hydrothermal deposition分类
地质学引用本文复制引用
李伟涛,张宇,刘武生,贾立城,李天瑜,杨喆..银额盆地塔木素铀矿床富磷铀矿石的岩石矿物学、地球化学特征及成因探讨[J].世界核地质科学,2025,42(2):246-262,17.基金项目
核技术研发项目(编号:地H2401)资助 Received date:2025-02-27 revised date:2025-03-30 （编号:地H2401）
