Calculated one-dimensional X-ray diffraction patterns of illite/smectite as fundamental particle aggregates

Tellier, Kathleen E.

doi:10.1349/ddlp.1776

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“…Detailed work on the stoichiometry of the smectite to illite reaction in sediments adjacent to igneous intrusions indicated that more illite was formed than would be anticipated from the initial smectite content (Lynch, 1985), demonstrating the importance of diagenetic illite neoformation in pelitic sediments. The fundamental particle data set was used to calculate one-dimensional layer sequences in a newly created computer code called FPMOD', and compared with conventional Markovian stacking arrangements within MacEwan crystallites (Tellier, 1988). The results indicated that, in general, the calculated diffraction profiles of I-S as fundamental particle aggregates realistically simulate XRD experimental observation, and that for long-range ordered R 2 and R 3 I-S, the calculated diffraction profiles of fundamental particle aggregates more realistically simulate experimental observations than calculated diffraction patterns based on Markovian sequences in MacEwan crystallites.…”

Section: P a R A D I G M S H I F Tmentioning

confidence: 99%

Fundamental particles: an informal history

Nadeau

1999

Clay miner.

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An informal overview is given of the development of the fundamental particle model, where, in a series of papers published from 1982-1987, researchers from the Macaulay Institute presented a radical model for the interpretation of the crystal structure, chemistry, and genesis of interstratified clays. The model reconciled electron microscopy and X-ray diffraction (XRD) data from a variety of sedimentary clay specimens, and proposed that these minerals were composed of nano-crystalline ‘fundamental particles’ whose adsorptive interfaces were responsible for the expanding smectite layers observed by XRD. The term ‘interparticle diffraction’ was used to describe this phenomenon. Experiments were reported which proved the model, by producing randomly interstratified illite-smectites from combinations of ordered illite-smectite and smectite clay dispersions. The model was extended to propose that fundamental particles were the primary units of crystallization, and that changes in the particle population were responsible for the commonly observed evolution in XRD character of these minerals with increasing depth of burial and temperature.

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Section: P a R A D I G M S H I F Tmentioning

confidence: 99%

Fundamental particles: an informal history

Nadeau

1999

Clay miner.

View full text Add to dashboard Cite

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Calculated one-dimensional X-ray diffraction patterns of illite/smectite as fundamental particle aggregates

Cited by 1 publication

References 0 publications

Fundamental particles: an informal history

Fundamental particles: an informal history

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