贵州正安新模铝土矿沉积体系构建及其控矿作用OA

This study reconstructs the sedimentary facies of aluminum-bearing strata in the Xinmo bauxite deposit based on sedimentological principles,constructs its sedimentary system,investigates the relationship between sedimen-tary facies and bauxite mineralization as well as their controlling effects,and achieves mineral exploration prediction.The findings provide a basis for predicting concealed bauxite deposits in the Wuzhengdao area.The results indicates that bauxite formation is strictly controlled by sedimentary environments.The Xinmo bauxite deposit formed within a barrier coast sedimentary system,where different sedimentary facies exert distinct controls on the distribution and qual-ity of the ore.Significant variations in ore body thickness and quality are observed across different sedimentary subfa-cies and microfacies.The most favorable mineralization environment for bauxite is characterized by barrier coast facies,particularly the Barrier Island Subfacies(including barrier sandbar,overflow fan,tidal delta microfacies)and Tidal transformation delta subfacies(specifically submerged distributary channel microfacies).High-grade,thick ore bodies are primarily concentrated in barrier sand bars and washover fans within the barrier island subphase,as well as in sub-merged distributary channels of the tidal-modified delta.Based on these insights,reconstructing sedimentary systems and facies holds significant exploration value for bauxite prospecting.This warrants in-depth research by geologists to enhance the reliability of mineral prediction for this bauxite type.