贵州正安新模铝土矿沉积体系构建及其控矿作用
袁清松 , 田合利 , 杜红毅 , 李源洪 , 陈强 , 李信念 , 聂坤
现代地质 ›› 2026, Vol. 40 ›› Issue (2) : 317 -328.
贵州正安新模铝土矿沉积体系构建及其控矿作用
Construction of Sedimentary System and Its Ore-controlling Effect of Xinmo Bauxite in Zheng’an, Guizhou
基于沉积学理论对新模铝土矿含铝岩系沉积相进行恢复,构建其沉积体系,探究沉积相与铝土矿成矿的关系及控矿作用,为务正道地区隐伏铝土矿找矿预测提供依据。研究表明铝土矿的形成严格受沉积环境的控制,新模铝土矿床为有障壁海岸沉积体系,沉积体系中沉积相的不同控制了铝土矿的分布及品质,不同沉积亚相、微相的矿体厚度、品质有着明显差异,铝土矿有利成矿环境为有障壁海岸相:障壁岛亚相(障壁沙坝、冲溢扇、潮汐三角洲微相)及潮汐改造三角洲亚相(水下分流河道微相)。高品位、厚矿体主要集中在障壁岛亚相的障壁沙坝、冲溢扇微相中及潮汐改造三角洲亚相的水下分流河道微相。基于以上认识,认为沉积体系及沉积相的恢复对铝土矿找矿具有显著意义,值得地质工作者深入研究,以提高找矿预测的可靠性。
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 sedimentary 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 quality of the ore. Significant variations in ore body thickness and quality are observed across different sedimentary subfacies 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 submerged 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.
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贵州省科学技术厅找矿突破战略行动重大协同创新项目(黔科合战略找矿[2022]ZD003)
贵州省地矿局科技创新人才团队培育计划项目(黔地矿科合[2023]TD004)
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