两种方法计算黏土矿物相对含量结果的比较

COMPARISON BETWEEN TWO METHODS USED FOR CALCULATING RELATIVE CLAY MINERAL CONTENTS

应用Biscaye或Cook计算方法,均可得到样品中黏土矿物的相对含量,但前者主要用于细颗粒沉积物定向片衍射图谱的解析,而后者适用于各种粉晶衍射结果的处理。对长江口及东海陆架区表层沉积物样品中<2μm粒级组分进行了X射线衍射分析,分别采用上述两种方法计算了样品中4种主要黏土矿物(蒙皂石、伊利石、高岭石和绿泥石)的相对含量,并比较了两种计算结果的差别。结果显示,Cook算法在<2μm定向片与粉晶中的计算值差别较小。在东海陆架区<2μm沉积物定向片样品中,两种计算方法所得结果在蒙皂石、伊利石相对含量等参数上具有显著相关性;尝试选择其中相关关系以及线性拟合程度较好的数据,建立了两种黏土矿物相对含量计算结果间的转换关系式。

There are differences between the methods of Biscaye (1965) and Cook (1975) et al used for calculating relative clay mineral contents.The former is usually used in the analyses of oriented slides,while the latter is suitable to deal with the random powder X-ray diffraction mounts.In this study,main types of clay minerals (i.e.smectite,illite,kaolinite and chlorite) in <2 μm fraction sediments of the 7 surface samples from the Yangtze Estuary and 258 surface sediment samples from the continental shelf of ...