(1. 中国地质大学 资源学院，武汉 430074；
2. 中国地质大学 构造与油气资源教育部重点实验室，武汉 430074；
3. 中国地质大学 地球科学学院，武汉 430074；
4. 中国地质大学 生物地质与环境地质国家重点实验室，武汉 430074；
5. 贵州省地质矿产勘查开发局 106地质大队，遵义 563000)
摘 要: 通过手标本观察、探针片镜下鉴定、XRD分析、扫描电镜分析等手段对黔北务川-正安-道真地区铝土矿的矿物学特征和地球化学特征进行研究。务正道铝土矿主要矿物为硬水铝石、高岭石、绿泥石、伊利石，次要矿物为软水铝石与黄铁矿，铝土矿常量元素以Al2O3、SiO2和TFe2O3为主，MgO和TiO2含量次之。风化过程中Zr、Cr、V、Li等微量元素明显富集，Zr和Hf以及Nb和Ta 呈高度正相关关系。微量元素比值表明：务正道铝土矿是以韩家店组页岩为主，黄龙组灰岩为辅，并有其余物源混入的多物源体系。
关键字: 常量元素；微量元素；物源；铝土矿；务川-正安-道真地区
（1. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;
2. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,
China University of Geosciences, Wuhan 430074, China;
3. School of Geosciences, China University of Geosciences, Wuhan 430074, China;
4. State Key Laboratory of Biogeology and Environment Geology, China University of Geosciences,
Wuhan 430074, China;
5. Geological Team 106, Guizhou Bureau of Geology and Mineral Exploration and Development, Zunyi 563000, China）
Abstract:The mineralogical and geochemical characteristics of the bauxite in Wuchuan-Zheng’an-Daozhen area were investigated through the handle specimen observation, thin section analysis, XRD and SEM. The mineral analyses reveal that diaspore, kaolinite, chlorite and illite are the major minerals in the bauxite with small amounts of boehmite and pyrite. Geochemical investigations reveal that the main components in the bauxite are Al2O3, SiO2 and TFe2O3, the minor components, are MgO and TiO2. In the process of weathering, some trace elements, such as Zr, Cr, V and Li, are enriched. Zr vs Hf and Nb vs Ta display the highest positive correlation. Trace elements show that Hanjiadian Formation is the main source of material for the bauxite formation, Huanglong Formation is the second important parent rock and there may be exist other precursor rock provide few material for the bauxite formation.
Key words: major elements; trace elements; parent rock; bauxite; Wuchuan-Zheng,an-Daozhen area
