Montmorillonite in soils
2000
Kannica Yoothong | Wanpen Wiriyakitnateekul (Department of Land Development, Bangkok (Thailand). Soil Analysis Div.)
Study on montmorillonite was cornducted on ninety soil series with clayey particle size class according to Soil Taxonomy (1975), using x-ray diffraction technique. The results reveal that many soil series contain montmorillonite along with other mineral components. Montmorillonite content varies from small to over ninety percentas in the clay fraction. Soils formed from marine, brackish and fresh water deposits and occur on active tidal flats, former tidal flats, flood plain and river basin types of physiography, have low to rather high content of montmorillonite, and more montmorillonite in marine and brackish water deposits than fresh water deposits. Soils formed from alluvium rich in montmorillonitic clay, limestone and marls, calcareous siltstone and calcareous shale, basic rocks such as basalt, basalt and andesite and sometimes with limestone also, and occur on semi rement terraces (low terraces) or the lower part of lava flows in the case of basaltic soils, have rather high to very high content of montmorillonite. Montmorillonite can be found in ten Great Soil Groups namely: Chromuderts, Chromusterts, Haplusterts, Pelluderts, Pellusterts, Haplaquolls, Haplustolls, Hydraquents, Sulfaquents and Tropaquepts. They belong to Entisols, Inceptisols, Vertisols and Mollisols according to Soil Taxonomy.
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