GEOLOGICAL CHARACTERISTICS OF BAUXITE DEPOSIT IN THE DEEP OF YANLONG OREFIELD IN HENAN PROVINCE

The Yanlong bauxite deposit, which occurs in Carboniferous Benxi Formation on the Middle Ordovician erosion surface, is a typical concealed bauxite deposit in western Henan Province. The thickness of ore-bearing formation and shapes of bodies are controlled by the paleo-karst erosional surface, and are greatly influenced by structures. The dominant Al-bearing minerals include diaspore, kaolinite and illite. The upper and lower parts of the bauxitic mudstone are mainly based on kaolinite and illite respectively. The paragenetic minerals of bauxite have a great value, while the associated minerals need further study.