Occurrence State of Fe-Ti Oxides and Its Response to Uranium Mineralization Process in Interlayer Oxidation Zone of Qianjiadian Uranium Deposit
Zhang Yuchen
Rong Hui
Jiao Yangquan
Cao Minqiang
Li Qingchun
Guo Liangliang
Guo Changqi
Zhou Mingwang
Abstract：Fe-Ti oxides are extremely sensitive to changes in the redox environment and are extremely important indicator minerals for studying the mineralization of sandstone-type uranium deposits.However,there are few quantitative data constraints on morphology,contents and compositions of Fe-Ti oxides in the interlayer oxidation zone of sandstone-type uranium deposits.Therefore,in this study it focuses on illustrating Fe-Ti oxides in the interlayer oxidation zone of Qianjiadian uranium deposit in Songliao basin.Six types of Fe-Ti oxides including ilmenite,titanohematite,titanomagnetite,leucoxene,rutile and anatase have been identified by polarizing microscope,SEM and electron probe microanalyzer.The titanohematite and titanomagnetite mainly occur in the strong oxidised subzone and weak oxidised subzone;the leucoxene,anatase and titanium magnetite are mainly distributed in the faint oxidised subzone;the leucoxene and anatase are primarily formed in the transition zone,and the rutile,ilmenite and leucoxene are frequently found in the reduction zone.Seven alteration sequences are identified according to the interspersed wrapping relationship between Fe-Ti oxides in each zone.Four alteration sequences composed of ilmenite →titanomagnetite→magnetite,ilmenite→titanohematite,leucoxene→ titanomagnetite → magnetite and leucoxene → titanohematite are mainly found in the strong oxidised subzone,weak oxidised subzone and faint oxidised subzone,and these sequences record a large-scale interlayer oxidation event.Two alteration sequences including leucoxene → anatase and rutile → anatase primarily occur in the transition zone,these sequences reveal that the deposit was transformed by low-temperature hydrothermal fluids.The last alteration sequence is ilmenite→anatase which mainly occur in the reduction zone,and this sequence reflects a weakly acidic-weakly alkaline environment during diagenesis.The research provides a foundation for the studying Fe-Ti oxides as indicator minerals to study fine zoning of interlayer oxidation zones and mineralization process of sandstone-type uranium deposits.
Keywords：Fe-Ti oxidesandstone-type uranium depositinterlayer oxidation zoneYaojia FormationSongliao basinuranium reservoirsedimentologydeposit
Publication Date：2024-06-15
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：20( 2024-2043 )