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Detailed X-ray diffraction characterization of illite-smectite from an Ordovician K-bentonite, Walker County, Georgia, USA

  • P. A. Schroeder (a1) and R. Irby (a1)

Extract

Outcrop samples of Ordovician K-bentonite from northeast Georgia were studied with X-ray diffraction (XRD) using different cation saturations to look for possible redistribution in layer charge. It was noted that XRD patterns of the samples responded uniquely to each cation treatment. The purpose of this note is to demonstrate a refinement to the method of Środoń (1980) for the precise identification of mixed-layer illite-smectite (I-S) and to note the importance of using several homoionic saturations in the interpretation of the XRD patterns.

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Cetin, K. & Huff, W.D. (1995) Layer charge of the expandable component of illite/smectite in Kbentonite as determined by alkylammonium ion exchange. Clays Clay Miner. 43, 150158.
Eberl, D.D. (1980) Alkali cation selectivity and fixation by clay minerals. Clays Clay Miner. 28, 161172.
Haynes, J.T. (1995) The Ordovician Deicke and Millbrig K-bentonite beds of the Cincinnati Arch and southern Valley and Ridge Province. Geol. Soc. Amer. Special Paper 290, 80 pp.
Hurst, V.J., Schroeder, P.A. & Styron, R.W. (1997) Accurate quantification of quartz and other phases by powder x-ray diffractometry. Anal. Chim. Acta, 337, 233252.
MacEwan, D.M.C. & Wilson, M.J. (1980) Interlayer and intercalation complexes of clay minerals. Pp. 197–248 in: Crystal Structures of Clay Minerals and their X-ray Identification. Mineralogical Society Monograph 5, (Brindley, G.W. & Brown, G., editors). London, UK.
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Reynolds, R.C. (1985), NEWMOD–A computer program Jbr the calculation of one-dimensional Xray diJJhaction patterns of mixed-layered clays. 8 Brook Rd., Hanover, NH, USA.
Środoń, J. (1980) Precise identification of illite/smectite interstratification by X-ray powder diffraction. Clays Clay Miner. 28, 401411.

Detailed X-ray diffraction characterization of illite-smectite from an Ordovician K-bentonite, Walker County, Georgia, USA

  • P. A. Schroeder (a1) and R. Irby (a1)

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