High-resolution imaging of ordered mixed-layer clays
Klimentidis, R.E. & Mackinnon, I.D.R. (1986) High-resolution imaging of ordered mixed-layer clays. Clays and Clay Minerals, 34(2), pp. 155-164.
HRTEM has been used to examine illite/smectite from the Mancos shale, rectorite from Garland County, Arkansas; illite from Silver Hill, Montana; Na-smectite from Crook County, Wyoming; corrensite from Packwood, Washington; and diagenetic chlorite from the Tuscaloosa formation. Thin specimens were prepared by ion milling, ultra-microtome sectioning and/or grain dispersal on a porous carbon substrate. Some smectite-bearing clays were also examined after intercalation with dodecylamine hydrochloride (DH). Intercalation of smectite with DH proved to be a reliable method of HRTEM imaging of expanded smectite, d(001) 16 A which could then be distinguished from unexpanded illite, d(001) 10 A. Lattice fringes of basal spacings of DH-intercalated rectorite and illite/smectite showed 26 A periodicity. These data support XRD studies which suggest that these samples are ordered, interstratified varieties of illite and smectite. The ion-thinned, unexpanded corrensite sample showed discrete crystallites containing 10 A and 14 A basal spacings corresponding with collapsed smectite and chlorite, respectively. Regions containing disordered layers of chlorite and smectite were also noted. Crystallites containing regular alternations of smectite and chlorite were not common. These HRTEM observations of corrensite did not corroborate XRD data. Particle sizes parallel to the c axis ranged widely for each sample studied, and many particles showed basal dimensions equivalent to > five layers. -J.M.H.
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|Item Type:||Journal Article|
|Additional Information:||Cited By (since 1996): 30
Export Date: 19 February 2013
Language of Original Document: English
|Keywords:||CLAY MINERALS, ELECTRON MICROSCOPY, HIGH-RESOLUTION IMAGING, MIXED-LAYER CLAYS, Intercalated clays|
|Subjects:||Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Mineralogy and Crystallography (040306)|
|Divisions:||Current > Institutes > Institute for Future Environments|
|Copyright Owner:||Copyright 1986 The Clay Minerals Society|
|Copyright Statement:||Reproduced with kind permission of The Clay Minerals Society, publisher of Clays and Clay Minerals.|
|Deposited On:||25 Feb 2013 01:22|
|Last Modified:||12 Nov 2013 11:02|
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