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TitreGeochemical variability of soils in the maritime provinces of Canada and the New England states of the United States
AuteurGrunsky, E C; Woodruff, L G; Drew, L J; Friske, P W B; Sutphin, D M
SourceNational Environmental Monitoring Conference 2011, presentations; 2011 p. 1-25
LiensOnline - En ligne
Année2011
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110417
RéunionNational Environmental Monitoring Conference 2011; Bellevue; US; août 15-19, 2011
Documentlivre
Lang.anglais
Mediaen ligne; numérique
Formatspdf
ProvinceNouveau-Brunswick; Nouvelle-Écosse; Île-du-Prince-Édouard
SNRC11D; 11E; 11F; 11K; 11L; 20P; 21A; 21B; 21E; 21F; 21G; 21H; 21I; 21J; 21K; 21N; 21O; 21P
Lat/Long OENS-78.0000 -59.5000 48.0000 40.5000
Sujetsstatistiques géochimiques; géochimie du sol; échantillons de sol; levés pédologiques; tills; dépôts glaciaires; géochimie des éléments en trace; statistiques; analyses statistiques; géomathématique; géochimie; minéralogie; pédologie; géologie des dépôts meubles/géomorphologie; Cénozoïque; Quaternaire
Illustrationslocation maps; tables; plots
ProgrammeGestionnaire de programme, Géoscience de l'environnement
Résumé(disponible en anglais seulement)
USA was initially part of the North American Soil Geochemistry Landscapes Project. Soil samples were collected from 0-5 cm depth (regardless of horizon), A, and C horizons. The 0 to 5 cm depth interval represents the soil of interest in health risk assessments and is here termed the PH (Public Health) horizon.
The use of multivariate statistical methods of the log-centred geochemistry from the three soil horizons reveals distinctive inter-element relationships from the C horizon upwards into the A and PH horizons. Statistical dispersion of several elements increases upwards in the soil profile. Maximum data dispersion occurs in the PH and A-horizon soils. Elements including Cd, S, P, Pb, Bi, Sb, Mo, Be, Zn and Cu are relatively enriched in the PH and A horizons (correlated with increasing organic carbon content) while elements including Ni, Mg, Cr, V, Co, Fe and Sc are relatively enriched in the C horizon, representing a mafic component of the protolith. The felsic component of the protolith is expressed as a relative enrichment of K, Rb, Zr, (REE), Li and Al. The relative associations among elements revealed in the first two principal components enable recognition of the underlying protolith, the effects of weathering, and meteoric water and groundwater interactions. The sources of these element associations can be attributed to underlying geology, soil-forming processes, and anthropogenic activity, or combinations of all three factors. With the multivariate approach, we can identify the combined influence of bedrock geology, climate, and geomorphology, all of which are encompassed in ecoregion classifications. Thus, with this multivariate approach we are able to characterize regional soil background variability for environmental and population health risk assessments.
GEOSCAN ID290182