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Transformation of Smectite to Illite in Bentonite and Associated Sediments from Kaka Point, New Zealand: Contrast in Rate and Mechanism
1997
Clays and clay minerals
Smectite and mixed-layer illite/smectite (US) in Triassic heulandite-rich bentonite from Kaka Point, New Zealand, have been investigated by scanning electron microscopy (SEM), transmission electron microscopy/analytical electron microscopy (TEM/AEM) and X-ray diffraction (XRD) for comparison with matrix phyllosilicates in closely associated siltstones and analcimized tuff. Samples that were treated to achieve permanent expansion showed that some smectite in bentonite occurs as curved packets of
doi:10.1346/ccmn.1997.0450106
fatcat:irfwdr3nnvguhjerfaobgjlpwe