Wyniki badań wybranych skał węglanowych i krzemionkowych metodami mikroskopii elektronowej

Abstract

THE RESULTS OF STUDIES OF SELECTED CARBONATE AND SILICEOUS ROCKES BY THE METHOD OF ELECTRON MICROSCOPY Summary Microstructures of carbonate and siliceous rocks were studied by means of transmitting electron microscope of the type UEMW-100 at the Institute of Building Techniques. They were analysed under accelerating voltage of 50 and 75 kV, and under magnifications from 10,000 to 20,000 times, or occasionally larger. The materials studied were treated with direct and indirect replica and powder methods. The studies contributed to the knowledge of properties and applicability of raw chalk, gaize, light gaize (diatomaceous earth), and flints. They showed that carbonate rocks primarily display replica surfaces of grained and rough-block types and covered by large numbers of coccoliths. The light gaize most often displays replica surfaces of spongy-porous, rough-knobby and crustal-globular types, characteristic of amorphous silica. Moreover, a new type of replica surface, hitherto unknown in the literature, was found. It is here termed as "sketetal" type; it is presumably typical of rock fragments built of opal-cristobalite.