Improving soil clay minerals studies by high-gradient magnetic separation

Abstract High-gradient magnetic separation (HGMS) performed on the clay fraction (< 1 µm) of acid soils facilitates the separation and concentration of mineral fractions according to their Fe and Mg contents. As a result, smectitic layers formed by weathering of a chlorite were identified although they were not detected in the bulk sample. The concentration in the non-magnetic fraction of minerals with an intergrade vermiculite-chlorite behaviour enabled more accurate information to be obtained on these minerals.

[1]  L. Lorphelin,et al.  Weathering of silt and clay in soils of a toposequence in the Himalayas, Nepal , 1986 .

[2]  R. Newman,et al.  THE OCCURRENCE OF INTERLAYER CLAY‐ORGANIC COMPLEXES IN TWO NEW ZEALAND SOILS , 1986 .

[3]  A. Meunier,et al.  Transformations des phyllosilicates dans un sol cryptopodzolique humifère du plateau de Millevaches, France , 1986, Clay Minerals.

[4]  A. R. Fraser,et al.  High-gradient magnetic separation (HGMS) in soil clay mineral studies , 1984, Clay minerals.

[5]  J. Hughes.  High gradient magnetic separation of some soil clays from Nigeria, Brazil and Colombia.: I. The interrelationships of iron and aluminium extracted by acid ammonium oxalate and carbon , 1982 .

[6]  L. Hossner,et al.  Transformation of Chlorite to Smectite Through Regularly Interstratified Intermediates 1 , 1981 .

[7]  D. C. Bain.  The weathering of ferruginous chlorite in a podzol from argyllshire, Scotland , 1977 .

[8]  A. Herbillon,et al.  Weathering of chlorite in a soil derived from a chloritoschist under humid tropical conditions , 1975 .

[9]  J. Oberteuffer,et al.  Magnetic separation: A review of principles, devices, and applications , 1974 .

[10]  L. A. Douglas.  SODIUM‐CITRATE-DITHONITE‐INDUCED ALTERATION OF BIOTITE , 1967 .

[11]  M. Jackson.  Interlayering of Expansible Layer Silicates in Soils by Chemical Weathering , 1962 .

[12]  T. Tamura.  IDENTIFICATION OF CLAY MINERALS FROM ACID SOILS , 1958 .

[13]  E. Ranst,et al.  Trioctahedral or dioctahedral chlorite in soils : examples of a dystrochrept (Corsica), a cryorthod (Norway) and a haplaqualf (France) , 1983 .

[14]  D. Schulze.  High gradient magnetic separation of iron oxide minerals from soil clays , 1977 .

[15]  M. L. Jackson,et al.  Iron oxide removal from soils and clays by a dithionite-citrate system buffered with sodium bicarbonate. , 1960 .