贵州遵义仙人岩铝土矿床古红土壳分带模式  

The zonal model for the paleo-weathering crust of the Xianrenyan bauxite deposit in Guizhou Province

作　　者：叶德书 李沛刚 朱永红 朱成林 赵应朝 

机构地区：[1]广州省地矿局106地质大队,贵州遵义563000

出　　处：《中国地质》2010年第5期1480-1489,共10页Geology in China

基　　金：中国地质调查局地质大调查项目(1212010813023)资助

摘　　要：笔者根据基底页岩在红土风化过程中的矿物成分和化学成分的演变规律,建立了遵义仙人岩铝土矿床古红土壳的分带模式,从上至下划分为:(1)铁铝质壳带,又称强风化带或最终分解带;(2)铁铝质粘土岩带,又称中度风化带或分解带;(3)粘土岩-黄铁矿带,又称弱风化带或轻微分解带;(4)原生页岩带。通过孢粉化石鉴定和Rb-Sr法同位素年龄测定,肯定了古红土壳形成于早石炭世大塘期旧司时,当属原地红土风化残积的产物。With the Xianrenyan bauxite deposit as an example and according to the evolution of mineral composition and chemical composition in the process of laterite weathering in the basic shale,the authors established a paleo-weathering crust zonal model for Zunyi bauxite deposits.The paleo-weathering crust is divided into four parts from top to bottom：（1） iron and aluminum crust zone,also known as the strongly weathered zone or the ultimate weathering zone;（2） iron and aluminum clay zone,also known as moderately weathered zone or the decomposition zone;（3） clay-pyrite zone,also known as weakly weathered zone or minor decomposition zone;（4） native shale zone.It is shown that the paleo-weathered crust was formed in the Jiusi Datang stage of Early Carboniferous period,as evidenced by fossil pollen identification and Rb-Sr isotopic dating,and it should be an in-situ residual product.

关 键 词：铝土矿 成矿母岩 古红土壳 分带模式 贵州遵义 

分 类 号：P618.45[天文地球—矿床学]