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| Registros recuperados: 129 | |
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| Descloitres, Marc; Robain, Henri; Dabas, M.; Camerlynck, C.; Albouy, Yves. |
| The tropical soils systems cover more than 1/3 of the emerged earth. The knowledge of the shallow structures is crucial for the understanding of global pedological functioning of soils. Multifrequency radar and pole-pole multi-electrode DC resistivity surveys were conducted here along the 950 meters long main traverse of Nsimi watershed to delineate the main pedological horizons. The results of pole-pole survey are interpreted using RES2DINV software, which allows a rapid 2-D inversion. The resulting image shows the main structures from shallow depth to more than 80 meters deep. Features like major fault, bedrock topography or altered zones are clearly defined. In order to image the shallower part of the section, the radar and a more detailed electrical... |
| Tipo: Text |
Palavras-chave: GEOPHYSIQUE; RADAR; PROFIL PEDOLOGIQUE; HORIZON; TYPOLOGIE. |
| Ano: 1997 |
URL: http://www.documentation.ird.fr/hor/fdi:010011223 |
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| Hidalgo, C.; Quantin, Paul; Elsass, F.. |
| The tepetates of Mexico Highlands are indurated horizons with fragipan pr0perties. Tepetates appear among pyroclastic deposits (T1, T2, T3). A soil profile located near Texcoco, Mexico, including tepetate layers was studied. Mineralogical and microscopical features of this profile were studied using a series of methods. This report the main results of the study. Tepetates were characterized by several features: first, the nature of their parent material; second, a close matrix microstructure and third, their colloidal fraction. The latter is conformed mainly by laminated 1:1 to 2:1 mixed layer minerals made of flaky layers. These features can explain the fragipan properties of tepetates and most of their mechanical behaviour. (Résumé d'auteur). |
| Tipo: Text |
Palavras-chave: SOL; INDURATION; CENDRE VOLCANIQUE; PYROCLASTITE; HORIZON; MINERALOGIE; METHODE D'ANALYSE; TEPETATE. |
| Ano: 1997 |
URL: http://www.documentation.ird.fr/hor/fdi:010012913 |
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| Registros recuperados: 129 | |
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