岩石颗粒度测量方法的研究及其应用

本文介绍了三种不同岩石颗粒度的测量方法,点计法,线计法,带计法及两种不同计算程序。颗粒度测量结果研究表明三种不同测量方法及两种不同计算程序之间存在着差別,其中结合野外的实例,其应用结果带计法为最好,线段长度百分比要比颗粒的频率百分比计算程序要好,前者能较客观地反映颗粒的实际搬运时水介质动力条件和沉积物的沉积环境。

STUDIES ON GRAIN-SIZE MEASUREMENT METHODS AND THEIR APPLICATIONS

The grain size of rocks is an indicator of hydrodynamic conditions of sedimentation and recurrence of hydrochemical conditions in sedimentary stage. Therefore, the accurate measurement of grain size is of great significance for the petrological and microstructural study of rocks. The relationship between grain size of various minerals, grain shape, character of distribution of grain size and environments of rock formation are close. They are indicators of physic-chemical conditions of deposition, contemporaneity, diagenesis and deformation. Three methods for the grain-size measurement, for example, point measurement method, linear measurement method, belt measurement method and two different counting procedures have been illustrated in detail in the paper. The comparison of these three methods has shown that the result obtained from grain number belt measurement method and counting procedure of linear length percentage represents more objectively the actual grain size of sedimentary rocks and sedimentary environment.