贵州北部铝土矿地球化学特征及沉积环境分析

Geochemical characteristics of bauxites in northern Guizhou and analysis of its sedimentary environment

贵州北部产于二叠系中统梁山组底部含矿岩系中的铝土矿,厚度稳定、变化较小,矿石质量较好。近几年相继找到的大中型矿床接踵而至,是渝南—黔北铝土矿集区的重要组成部分。通过道真新民、岩坪、桃园和务川瓦厂坪等矿床中铝土矿(岩)微量元素、稀土元素地球化学特征及沉积环境地球化学标志的研究,论证了贵州北部铝土矿床具有相同的物源和陆相淡水沉积环境。

The bauxite occurred in ore-bearing rock series at the bottom of Liangshan Formation of Middle Permian System is characterized by constant thickness,fewer changes,and good ore quality.In recent years medium-large scale deposits are found successively and they form an important part of South Chongqing-North Guizhou bauxite mineral assemblage area.Through the research on geochemical characteristics of trace elements and rare earth elements as well as geochemical clues for sedimentary environment of bauxite （bauxitite）in deposits of Daozhenxinmin,Yanping,Taoyuan and Wachangping of Wuchuan,it is verified that the bauxite deposits in northern Guizhou has the same provenance and non-marine freshwater deposit en-vironment.