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TEM observation of the smectite-to-palygorskite transition in deep Pacific sediments
AbstractThe smectite-to-palygorskite transition was observed in North Pacific deep-sea sediments by transmission electron microscopy (TEM). The original smectite is characterized by showing crinkled thin films whereas well crystallized palygorskite forms elongated lath-shaped crystals. Palygorskite formation appears to be initiated on the surface of smectite films. The initial short needles of palygorskite show predominantly 4.0–4.2-Å layers which evolve into fibres and lath-shaped crystals. At a later stage, crystals with well defined mozaic structure exhibit 6.3-Å and 3.15-Å spacings, (200) and (400) planes of palygorskite. Electron diffraction patterns of elongated laths show a combination of smectite (15.3 Å), chlorite (7.4 Å) and palygorskite (10.2 Å and 6.3 Å) spacings. The final product does not show mozaic structure and according to EDX it is composed of Si:Al:Fe:Mg in an approximate ratio 5.1:1.2:1:1, while for the initial smectite the ratio is 5.1:2.3:1:0.4. This study also illustrates the successful application of high resolution electron microscopy to the determination of mineral transformations.
TEM observation of the smectite-to-palygorskite transition in deep Pacific sediments
AbstractThe smectite-to-palygorskite transition was observed in North Pacific deep-sea sediments by transmission electron microscopy (TEM). The original smectite is characterized by showing crinkled thin films whereas well crystallized palygorskite forms elongated lath-shaped crystals. Palygorskite formation appears to be initiated on the surface of smectite films. The initial short needles of palygorskite show predominantly 4.0–4.2-Å layers which evolve into fibres and lath-shaped crystals. At a later stage, crystals with well defined mozaic structure exhibit 6.3-Å and 3.15-Å spacings, (200) and (400) planes of palygorskite. Electron diffraction patterns of elongated laths show a combination of smectite (15.3 Å), chlorite (7.4 Å) and palygorskite (10.2 Å and 6.3 Å) spacings. The final product does not show mozaic structure and according to EDX it is composed of Si:Al:Fe:Mg in an approximate ratio 5.1:1.2:1:1, while for the initial smectite the ratio is 5.1:2.3:1:0.4. This study also illustrates the successful application of high resolution electron microscopy to the determination of mineral transformations.
TEM observation of the smectite-to-palygorskite transition in deep Pacific sediments
Tazaki, Kazue (author) / Fyfe, W.S. (author) / Tsuji, M. (author) / Katayama, K. (author)
Applied Clay Science ; 2 ; 233-240
1987-02-11
8 pages
Article (Journal)
Electronic Resource
English
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