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- Title
Soil characterization using patterns of magnetic susceptibility versus effective radium concentration.
- Authors
Girault, F.; Poitou, C.; Perrier, F.; Koirala, B. P.; Bhattarai, M.
- Abstract
Low-field magnetic susceptibility Xm and effective radium concentration ECRa, obtained from radon emanation have been measured in the laboratory with 129 soil samples from Nepal. Samples along horizontal profiles in slope debris or terrace scarps showed rather homogeneous values of both Xm and ECRa. One sample set, collected vertically on a lateritic terrace scarp, had homogeneous values of ECRa while Xm increased by a factor of 1 to 10 for residual soils and topsoils. However, for a set of samples collected on three imbricated river terraces, values of ECRa, homogeneous over a given terrace, displayed a gradual increase from younger to older terraces. By contrast, Xm showed more homogeneous mean values over the three terraces, with a larger dispersion, however, for the younger one. Similarly, Kathmandu sediments exhibited a large increase in ECR, from sand to clay layers, while Xm increased moderately. The combination of Xm and ECRa, thus, provides a novel tool to characterize quantitatively various soil groups and may be of interest to distinguish modes of alteration or deposition histories.
- Subjects
MAGNETIC susceptibility; RADIUM; DISPERSION (Chemistry); TERRACES (Geology); HAZARD mitigation; SOILS
- Publication
Natural Hazards & Earth System Sciences, 2011, Vol 11, Issue 8, p2285
- ISSN
1561-8633
- Publication type
Article
- DOI
10.5194/nhess-11-2285-2011