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On the nature of fibrous illite as observed by electron microscopy

Published online by Cambridge University Press:  09 July 2018

J. M. Huggett
J. M. Huggett*
Affiliation:
Department of Geology, Royal School of Mines, Imperial College, LondonSW7 2AZ
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Abstract

In a study of sandstones from the Coal Measures (Westphalian A and B) of the East Midlands, UK, fibrous illites exhibiting random core and lath structures were observed during SEM examination of material dried in air, but not during TEM examination of ultrathin sections made from the same material. Previous studies have reported random core and lath structures during TEM examination of extracted clay material and it is suggested that they are an artefact of the specimen preparation technique.

Resume

Resume

Lors de l'étude de grès du Houiller (Westphalien A et B) des East-Midlands (GB), les illites fibreuses présentent des structures en grains ou à lattes, au hasard, lorsqu'elles sont observées par MEB sur du matériel séché à l'air, mais non lors de l'observation par MET de sections ultra-fines préparées à partir du même matériel. Des études précédentes avaient démontré les mêmes structures, au hasard, en grains ou en lattes, lors de l'examen par MET de matériel argileux extrait et il est suggéré que cette structure est un artéfact dû à la technique de préparation

Kurzreferat

Kurzreferat

In Sandsteinen aus dem Bereich der Coal Measures (Kohlenkalk, Westphalian A und B) der East Midlands, U.K., zeigen faserige Illite bei SEM-Untersuchungen an luftgetrockneten Proben unregelmäßige radialstrahlige Nadelbüschel Strukturen. Dies kann bei TEM-Aufnahmen von Ultradünnschnitten desselben Materials nicht beobachtet werden. Bei vorangegangenen Untersuchungen wurden solche Strukturen in der Tonfraktion auch im Transmissions-Elektronen-mikroskop beobachtet; nun wird angenommen, daß es sich dabei um ein Artefakt der Präparationstechnik gehandelt hat.

Resumen

Resumen

En el estudio de unas areniscas de la Coal Measures (Westphalian A y B) de East Midlands (Inglaterra), se observó la presencia de ilitas fibrosas agrupadas desordenadamente en nódulos o cintas, cuando se estudiaban cortes ultrafinos del material original por microscopia electrónica de sonido (SEM), pero no durante su estudio por microscopia electrónica de transmisión (TEM). En estudios anteriores se ha observado la presencia de nódulos y cintas en el estudio por TEM, del material arcillosos extraído, sugiriéndose que ésto puede ser un artefacto producido por la preparación de muestras.

Type
Research Article
Information
Clay Minerals , Volume 17 , Issue 4 , December 1982 , pp. 433 - 441
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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