摘要
玄武岩红土壳具帝状结构。本文叙述了红土壳各带的岩石、矿物特征,风化过程中元素的迁移和聚散,硅铝分离、铁铝分离在铝土矿形成上的重要意义;用扫描电镜和能谱仪对各带样品作了系统观测;探讨了矿物的风化和演变;认为三水铝石可通过多种方式形成于风化作用的不同阶段。
Lateritic crust of basalts is of zonal texture.This paper describes the cha-racteristics of minerals and rocks in each zone of lateritic crust,and indicates that the separation of Al from Si and Fe from Al as well as migration,concen-
tration and dispersion of elements during weathering play important roles in the formation of bauxite.Samples from each zone are systematically observed with scanning electron microscope and energy dispersion pectrum.Weathering and evolution of elements are also discussed in this paper.Author considers that gibbsite can be formed through many ways during different stages of weathering.
关键词
玄武岩
风化
成矿
新生代
铝土矿
basalt
crust of weathering
weathring
ore formation
gibbsite
aluminium deposit
rock-mineral determination
electron microscopic image/Zhangpu bauxite mine
