(1. 中國地質(zhì)大學 資源學院，武漢 430074；
2. 中國地質(zhì)大學 構造與油氣資源教育部重點實驗室，武漢 430074；
3. 中國地質(zhì)大學 地球科學學院，武漢 430074；
4. 中國地質(zhì)大學 生物地質(zhì)與環(huán)境地質(zhì)國家重點實驗室，武漢 430074；
5. 貴州省地質(zhì)礦產(chǎn)勘查開發(fā)局 106地質(zhì)大隊，遵義 563000)
摘 要: 通過手標本觀察、探針片鏡下鑒定、XRD分析、掃描電鏡分析等手段對黔北務川-正安-道真地區(qū)鋁土礦的礦物學特征和地球化學特征進行研究。務正道鋁土礦主要礦物為硬水鋁石、高嶺石、綠泥石、伊利石，次要礦物為軟水鋁石與黃鐵礦，鋁土礦常量元素以Al2O3、SiO2和TFe2O3為主，MgO和TiO2含量次之。風化過程中Zr、Cr、V、Li等微量元素明顯富集，Zr和Hf以及Nb和Ta 呈高度正相關關系。微量元素比值表明：務正道鋁土礦是以韓家店組頁巖為主，黃龍組灰?guī)r為輔，并有其余物源混入的多物源體系。
關鍵字: 常量元素；微量元素；物源；鋁土礦；務川-正安-道真地區(qū)
（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
