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This article in SSSAJ

  1. Vol. 46 No. 5, p. 1106-1108
    Received: Nov 30, 1981
    Accepted: May 14, 1982

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Influence of Soil Moisture on Smectite Formation in Soils Derived from Serpentinite1

  1. J. D. Istok and
  2. M. E. Harward2



X-ray diffraction (XRD), differential thermal analysis (DTA), and transmission electron microscopy (TEM) were used to characterize the phyllosilicates in a catena of soils derived from serpentinite in southwestern Oregon. Serpentine (variety chrysotile) and chlorite were the phyllosilicates in the bedrock and in the <2-µm fraction of soil samples from the two well-drained profiles. Samples from the two soils which were deeper, finer-textured, and more poorly drained consisted of smectite, serpentine, and chlorite. The data indicate that smectite is forming from serpentine and/or chlorite in poorly drained landscape positions. The abundance of amorphous material, revealed by TEM, may suggest a mechanism for smectite formation in these soils.

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