沉积学报2018，Vol.36Issue(2)：302-309,8.DOI:10.14027/j.issn.1000-0550.2018.040
黔北务正道地区沉积型铝土矿富集成矿主控因素分析
Effect of Sea Level Change on Enrichment and Mineralization of Bauxite:Taking Qianbei bauxite for example
摘要
Abstract
Bauxite deposit in Wuzhengdao of Qianbei,which is the biggest bauxite deposit of China, is sedimentary type bauxite,which is affected by facies and change of sea level.Based on analysis of lithology and geochemistry of bauxite-bearing rock series in the study area,the bauxite is formed in shore lake and shallow lake.So the bauxite is deposited in fresh water.The chlorite rock and bauxite rock are deposited in fan delta and tidal flat facies.The hydro-dynamic condition determines types and grade of bauxite.Grain bauxite is formed in strong hydrodynamic condition, soil type bauxite is formed in weak hydrodynamic condition.The chlorite rock and bauxite rock are deposited during rise of sea level,and bauxite is deposited during drop of sea level.The span of drop period is much greater than rise period,which explains why forming of bauxite is a long weathering progress.Up to three cycles can be identified dur-ing deposit of bauxite-bearing rock series,and the three cycles are consistent with corresponding period deposit of car-bonate rock and clastic rock in adjacent area.关键词
铝土矿含矿岩系/湖泊相/海平面变化/沉积旋回/颗粒状铝土矿Key words
sea level change/bauxite-bearing rock series/lacustrine/deposit cycle/grain bauxite分类
天文与地球科学引用本文复制引用
刘辰生,肖明国,苏娟,金中国,郭建华..黔北务正道地区沉积型铝土矿富集成矿主控因素分析[J].沉积学报,2018,36(2):302-309,8.基金项目
湖南省自然科学基金资助项目(2017JJ1034)Natural Science Foundation of Hunan Province,No.2017JJ1034 （2017JJ1034）
