摘要
对采自广东阳江花岗岩风化剖面的黑云母及其风化产物进行了Ｘ 射线衍射、扫描电子显微镜及能谱、高分辨透射电子显微镜等分析，并探讨了黑云母风化过程中成分的变化及矿物的转化机制。研究结果表明：阳江地区花岗岩中黑云母的风化系列为黑云母→蛭石、绿泥石→伊利石／绿泥石、高岭石；黑云母风化初期的蛭石和绿泥石是独立的矿物相，而不是通常认为的水黑云母，而混层矿物伊利石／ 绿泥石的出现则表明了以黑云母风化程度为指标的深度风化阶段；黑云母的风化是以多种模式共存的，既有单元层层间的变化，也有双层四面体的溶蚀，还包括层间及四面体变化的第三种类型。
The biotite and its weathering product of a granite profile in Yangjiang, Guangdong Province, were investigated with the methods of XRD, SEM and HRTEM. And moreover, the mechanisms of mineral composition change and decomposition during weathering process were discussed. The results show that the regional biotite weathering series is as follows: biotite →vermiculite, chlorite →illite/chlorite, kaolinite. It is the vermiculite and chlorite, not the generally considered hydrobiotite, that occur in separated phases in initial weathering period for biotite. And the appearance of illite/chlorite indicated a complete weathering period. Three types of model co exist in biotite weathering process, including change in interlayer, solution of vicinal tetrahedra, as well as changes in both interlayer and tetrahedra.
出处
《地球化学》
CAS
CSCD
北大核心
1999年第3期239-247,共9页
Geochimica
基金
广东省"九五"重大项目!( 编号:973106)
关键词
黑云母
风化
矿物变化
花岗岩
广东省
biotite,weathering,mineral change, granite, Guangdong Province
