Influence of Soil Moisture on Smectite Formation in Soils Derived from Serpentinite1
- J. D. Istok and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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