法国GUERET花岗岩内黑云母的结构特征研究

A STUDY ON THE TEXTURE OF BIOTITE IN GURET GRANITE,FRANCE

应用形态数学、图象分析及立体学原理，通过岩石薄片研究，对Ｇｕéｒｅｔ花岗岩内黑云母的结构特征进行了定量分析，揭示了黑云母矿物粒子在花岗岩中的密度、粒径、形状及空间分布的规律。根据岩石薄片上黑云母的灰度特征，应用直接成象方法获得其灰度图象，用自动阈值方法可用来提取黑云母粒子从而构成二值图象。借助ＭＩＰＳ图象分析系统，可以评价花岗岩薄片样本图象中所有黑云母粒子的参数，包括面积，周长等。花岗岩内黑云母矿物的密度、粒径、形状及空间分布的分析，揭示了其各向异性特征；同时，威布尔、正态及泊松模型可分别用来描述黑云母矿物的粒径。

The aim of this paper is to propose a quantitative analysis of the texture,including density,size,shape and spatial distribution,of the biotite in Guéret granite by thin section study.Results are inferred by means of basic principles of morphological mathematics,image analysis,and stereological methods. According to the gray scale characteristics of the biotite in thin sections,their gray images can be obtained by using a direct macro photo charting.Then,the method of an automatic thresholding is used to extract the particles of the biotite in ordre to form binary images.The parameters,e.g.the area and perimeter for the biotite particles,can be estimated in the binary image with the help of MIPS system.The analyses of the denity,size,shape and spatial distribution for biotite particle show an anisotropic characteristics in the granite.Meanwhile,Weibul,Normal and Poisson models can describe the distributions of size,shape and the spatial distribution respectively.