YAN Jian, DOU Song, ZHANG Dao-hong

 (Yunnan Nonferrous Metals Geological Bureau, Kunming 650051, China)

Abstract: This research on geochemical characteristics of main element from Datie bauxite deposit shows that Ti content in bauxite is similar to that in basalt but very different from limestone. The geochemical characters of main elements and trace elements show that bauxite deposit has closer relation with basalt than with limestone. Values of Al₂O₃/Sc, Al₂O₃/V, Sc/V, Sc/Nb, Sc/Ta, Nb/Ta and Zr/Hf of ore from Datie bauxite deposit were close to basalt and values of Al₂O₃/Ta, Al₂O₃/Nb, V/Nb and V/Ta of ore were close to limestone, indicating that mineralizing materials have the characters of multifarious source, and basalt would be the main mineralizing material source and limestone provides part mineralizing materials also. The rare-earth element partitioning model and its characteristics parameter showing high value of ΣREE are similar to basalt but very different from limestone. Concentrative coefficient K is 64.86 for ΣREE of bauxite to ΣREE of limestone but 2.46 for ΣREE of bauxite to ΣREE of basalt. Therefore, basalt has very close genetic relationship with bauxite and is the main source of mineralizing material of bauxite deposit. It is considered that mineralizing materials of bauxite in southeast Yunnan have characters of multifarious source and different bauxite deposits have different areas providing mineralizing material source because the diversity of ancient geography site, basement, weathering, denudation and sedimentary environment.