摘要
本文较详细地描述了产于浙江松阳峰洞岩迪开石矿床中的6个迪开石样品的矿物学特征;同时,发现部分样品中存在迪开石-高岭石无序混层,偏光显微镜下呈扇形蠕虫状,扫描电子显微镜下呈似香蕉状,波谱曲线上也有一定的显示,认为该混层是高岭石向迪开石转换过程中的中间产物。 峰洞岩迪开石的结晶度(HI)值与结构内全铁含量(x)间呈良好的负线性关系,线性回归方程为HI=1.811-5.787X,相关系数r=-0.9731,表明迪开石的结晶程度明显受控于其结构内类质同象置换的全铁含量。峰洞岩迪开石系热液蚀变而成,形成温度在110～140℃之间,不超过160℃。
This paper discusses thc mincralogical characteristics of six dickite samples and disor-. der mixed-layer dickitc-kaolinitc discovered in some samples from dickile ore diposits in Fengdongyan, Songyang, Zhcjiang province.Thc disorder mixed-layer dickitc-kaolinitc displays fan-like myrmckitc shape in polarizing microscope and presents banana-like shape in scanning electron microscope. On the spectral chart, it also shows some characteristics. It is considered that the mixed-layer dickite-kaolinite might be a intermediate product formed in transforming process of kaolinite to dickite.
The crystallinity (HI) is negatively correlated with the total iron content (X,%), and their linear correlation equation is HI= 1.811-5.787X, the coefficient of correlation (r) is -0.9731, indicating that the crystallinity of dickite is apparently controlled by content of iron entering the dickite structure in isomorphous substitution.
The dickite ore deposit in Fcndongyan is formed by hydrothcrmal alteration. The forming temperature is about between 110-140℃ , not exceeding 160℃ .
关键词
迪开石
结构
矿物学
洞岩
Dickitc, Structure, Zhejiang province.
