Clay minerals and the development of Quaternary soils in central Italy
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad Nacional Autónoma de México
2004
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| author | Edoardo A.C. Costantini |
| author_facet | Edoardo A.C. Costantini |
| contents | Clay minerals and the development of Quaternary soils in central Italy Edoardo A.C. Costantini Damiano Damiani Ciencias de la Tierra soil Quaternary clay minerals central Italy forming processes Clay mineral analysis is widely used to characterize soil parent material and to relate it to thebedrock. When it is applied to a soil profile, it can give a genetic signal of mineralogical transformationsdue to soil-forming processes. In this study, ten selected soil profiles in Montagnola Senese, central Italy,were analyzed for genetic signals of soil ageing, eluviation and illuviation, fragipan formation, andother processes. In previous investigations, the parent materials of benchmark soils of the area havebeen dated to gain an understanding of the Quaternary geomorphological evolution, which spans a timeranging from early Pleistocene to Holocene. The number of profiles selected allowed a statistical analysisof the parameters.Illite and kaolinite are the most quantitatively important phyllosilicates in the soils studied. Theother clay minerals found are vermiculite, hydroxy-interlayered vermiculite (HIV), illiteHIV and illitechlorite mixed layers, and chlorite. Soil ageing is characterized by a change in clay mineral compositionthat increases with age. Argilluviation is marked by a preferential accumulation of kaolinite in illuvialhorizons, while formation of tongues in fragipans does not cause any significant difference in claymineral composition between bleached and stained parts of the horizons. Furthermore, bulk density offragipans is not related to clay mineral content. On the other hand, large bleached masses in moremature soils contain more kaolinite and vermiculite than the surrounding mass. The trends in the contentsof clay minerals through the soil horizons confirm the two types of lithological discontinuities that werepredicted during the field survey. 2004 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57221116 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.1 Vol.21 |
| format | Artículo científico |
| id | redalyc_57221116 |
| institution | Redalyc |
| language | en |
| publishDate | 2004 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Clay minerals and the development of Quaternary soils in central Italy Edoardo A.C. Costantini Ciencias de la Tierra soil Quaternary clay minerals central Italy forming processes Clay minerals and the development of Quaternary soils in central Italy Edoardo A.C. Costantini Damiano Damiani Ciencias de la Tierra soil Quaternary clay minerals central Italy forming processes Clay mineral analysis is widely used to characterize soil parent material and to relate it to thebedrock. When it is applied to a soil profile, it can give a genetic signal of mineralogical transformationsdue to soil-forming processes. In this study, ten selected soil profiles in Montagnola Senese, central Italy,were analyzed for genetic signals of soil ageing, eluviation and illuviation, fragipan formation, andother processes. In previous investigations, the parent materials of benchmark soils of the area havebeen dated to gain an understanding of the Quaternary geomorphological evolution, which spans a timeranging from early Pleistocene to Holocene. The number of profiles selected allowed a statistical analysisof the parameters.Illite and kaolinite are the most quantitatively important phyllosilicates in the soils studied. Theother clay minerals found are vermiculite, hydroxy-interlayered vermiculite (HIV), illiteHIV and illitechlorite mixed layers, and chlorite. Soil ageing is characterized by a change in clay mineral compositionthat increases with age. Argilluviation is marked by a preferential accumulation of kaolinite in illuvialhorizons, while formation of tongues in fragipans does not cause any significant difference in claymineral composition between bleached and stained parts of the horizons. Furthermore, bulk density offragipans is not related to clay mineral content. On the other hand, large bleached masses in moremature soils contain more kaolinite and vermiculite than the surrounding mass. The trends in the contentsof clay minerals through the soil horizons confirm the two types of lithological discontinuities that werepredicted during the field survey. 2004 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57221116 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.1 Vol.21 |
| title | Clay minerals and the development of Quaternary soils in central Italy |
| topic | Ciencias de la Tierra soil Quaternary clay minerals central Italy forming processes |
| url | https://www.redalyc.org/articulo.oa?id=57221116 |