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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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References

Blanche, J.M. & Whitaker, J.M. McD. (1978) Diagenesis of part of the Brent sand formation (Middle Jurassic) of the northern North Sea Basin. J. Geol. Soc. 135, 78–82.CrossRefGoogle Scholar
Gatineau, L. (1964) Structure réelle de la Muscovite Repartition des substitutions isomorphes. Bull. Soc. Fr. Miner. Cristallogr. 87, 321–355.Google Scholar
Güven, N. (1972) Electron optical observations on Marblehead illite. Clays Clay Miner. 20, 83–88.CrossRefGoogle Scholar
Güven, N., Hower, W.F. & Davies, D.K. (1980) Nature of authigenic illites in sandstone reservoirs. J. Sediment Petrol. 50, 761–766.Google Scholar
McHardy, W.J., Wilson, M.J. & Tait, J.M. (1982) Electron microscope and X ray diffraction studies of filamentous illitic clay from sandstones of the Magnus field. Clay Miner. 17, 23–39.CrossRefGoogle Scholar
Mosser, C. (1974) Illites en lattes, illites pseudohexagonal, processus de formation: experimentation. Clay Miner. 10, 145–151.CrossRefGoogle Scholar
Mosser, C. Gall, J.C. & Tardy, Y. (1972) Geochimie des illites du grès a Voltzia du (Buntsandstein superior) des Vosges du nord, France. Chem. Geol. 10, 157–177.CrossRefGoogle Scholar
Osipov, V.I. & Sokolov, V.N. (1978) Microstructure of recent clay sediments examined by scanning electron microscopy. Pp 27–40 in: Scanning Electron Microscopy in the Study of Sediments (Whalley, W.B., editor). Geo Abstracts, Norwich.Google Scholar
Rex, R.W. (1965). Authigenic kaolinite and mica as evidence for phase equilibria at low temperatures. Clays Clay Miner. 13, 95–104.CrossRefGoogle Scholar
Seeman, U. (1979) Diàgenetically formed interstitial clay minerals as a factor in Rotliegend sandstone reservoir quality in the Dutch Sector of the North Sea. J. Petrol. Geol. 1, 55–62.CrossRefGoogle Scholar
Stalder, P.J. (1973) Influence of crystallographic habit and aggregate structure of authigenic clay minerals on sandstone permeability. Geol. Mijnboun 52, 217–220.Google Scholar
Weaver, C.E. (1953) A lath shaped non-expanded dioctahedral 2:1 clay mineral. Am. Miner. 38, 279–289.Google Scholar