Analysis on Gallium Geochemical Characteristics and Ore-forming Environment of Bauxite Mine in Yinkuangyakou of Chongqing

Key words: 
• gallium /
• bauxite deposit /
• geochemistry /
• Ore-forming environment /
• Chongqing

Abstract: Research on the Chongqing Yinkuangyakou bauxite deposit revealed that gallium is generally more than the lowest indicators of comprehensive utilization of industrial,gallium content of the bauxite deposits in the ore-bearing series are distributed, and gallium to Al₂O₃ weakly positive correlation. Sr/Ba ratio inferred continental sedimentation is main; the result which the sample Rb/K value is less than the standard marine sedimentary 0.006 reflected brackish transitional zone deposition to freshwater deposition; U/Th ratio range 0.1 to 0.73 and V/Cr ratio from 0.5 to 2.04, which can distinguish ore-bearing rock series are typical oxidizing environment; Seawater may influence ore-bearing rock series during deposition by the calculation of the ratio of Ni/Co found; Ga/Al ratio varied from 0.53 to 1.74, the mineralization medium pH changed magnitude smaller; containing pyrite from the ore-bearing rock mineral assemblage, kaolinite and other minerals can be inferred that the medium is acidic likely. Chondrite-normalized distribution patterns shows LREE enrichment and HREE losses, δCe <0.95 ( four samples )is negative anomalies, 0.95 <δCe <1.05 for normal samples 3, 19 positive anomalies,Eu shows negative anomalies; the overall aqueous media should mainly freshwater basic in oxidizing and acidic environment.  The deposit is a continental deposit  with  the main freshwater to  paralic environment.