Late carboniferous weathering and bauxite mineralization process in Yanlong area of Henan
From the study of the paleogeographic environment characteristics,petrographic characteristics of the ore-bearing strata,rock mineral characteristics and enrichment characteristics of ore-forming elements of the bauxite mineralization in the Yanlong area,the paper has analyzed the dynamic process of desilication and aluminum enrichment during the three stages of bauxite mineralization in the weathering process within the Late Carboniferous Benxi Formation and further has also discussed the Late Carboniferous bauxite minerali-zation under the weathering condition in this area.During the bauxite mineralization mainly controlled by the weathering process,the ore-bearing host rock firstly form clay minerals,and then when the content of Al2O3 in the rocks reaches up to 35％,the initial bauxite with gibbsite as the main component begins to form.Fi-nally,under the cover of the overlayed strata,the gibbsite transforms into diaspore under certain tempera-ture and pressure condition.The typical structure of Benxi Formation bauxite deposit series is eventually formed,which includes"coal-clay-bauxite-iron clay".
bauxite depositweathering function"coal-aluminium-iron"sequence structureYanlong area of Henan
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