Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Canada → Mineralogical and micromorphological characteristics of recrusted malien soils : influence on weatherability and dust production

University of Guelph (1992)

Mineralogical and micromorphological characteristics of recrusted malien soils : influence on weatherability and dust production

Gerdes, Greta

Titre : Mineralogical and micromorphological characteristics of recrusted malien soils : influence on weatherability and dust production

Auteur : Gerdes, Greta

Université de soutenance : University of Guelph,

Grade : M.Sc. 1992.

Résumé
This thesis is an investigation of the propensity of re-crusted desert soils to release sediment from their surfaces as a result of weathering in an environmental chamber. Eight soil samples from Mali and one kaolinite sample were re-crusted and placed in an environmental chamber (constructed for this experiment) and subjected to diurnal variations in temperature and relative humidity (as measured in situ). The bulk soil samples were analyzed for grain-size (sieve and pipette), clay mineralogy (X-ray diffraction) and qualitative crust strength (thumb and forefinger field method). Both natural and re-crusted samples were also examined with a scanning electron microscope (SEM) in conjunction with energy dispersive spectroscopy (EDS) to observe microfabric (SEM) and to obtain a general idea of the crust chemistry (EDS). Finally, the crust surfaces were aspirated both before placement in the chamber (to clean the surfaces) and after ’weathering’ in the chamber (to determine the amount of dust liberation)

Présentation (Amicus)

Page publiée le 21 mars 2010, mise à jour le 9 février 2018