| Titre | Chemostratigraphy in southern Ontario by pXRF spectrometry |
| Télécharger | Téléchargement (publication entière) |
| |
| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Knight, R ;
Russell, H A J; Bajc, F |
| Source | Regional-scale groundwater geoscience in southern Ontario: an Ontario Geological Survey, Geological Survey of Canada, and Conservation Ontario open house; par Russell, H A J; Ford, D; Priebe, E H; Commission géologique du Canada, Dossier public 8212,
2017 p. 23, https://doi.org/10.4095/299780  Accès
ouvert |
| Année | 2017 |
| Éditeur | Ressources naturelles Canada |
| Réunion | Ontario Geological Survey and Geological Survey of Canada groundwater geoscience open house; Guelph; CA; mars 1-2, 2017 |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/299780 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Regional-scale groundwater geoscience in southern Ontario: an Ontario Geological Survey, Geological Survey of Canada, and Conservation Ontario open house |
| Formats | pdf |
| Province | Ontario |
| SNRC | 30; 31C; 31D; 40; 41A; 41G; 41H/03; 41H/04; 41H/05; 41H/06; 41H/12; 41H/13 |
| Région | le sud de l'Ontario |
| Lat/Long OENS | -84.0000 -76.0000 46.0000 41.5000 |
| Sujets | eau souterraine; aquifères; dépôts glaciaires; analyses stratigraphiques; géochimie du sédiment; instruments d'observation; analyses spectrométriques; méthodes de fluorescence aux rayons x; trous de mine;
échantillons carrotés; preparation d'échantillons; analyse par spectromètre de masse; calcium; fer; potassium; manganèse; rubidium; strontium; vanadium; zinc; zirconium; baryum; cuivre; chrome; titane; plomb; Contrôle de la qualité; hydrogéologie;
stratigraphie; géochimie; Phanérozoïque; Paléozoïque; Dévonien; Silurien; Ordovicien; Cambrien |
| Programme | Géoscience des eaux souterraines , Aquifer Assessment & support to mapping |
| Programme | Géoscience des eaux souterraines , Aquifer Assessment & support to mapping |
| Diffusé | 2017 02 22 |
| Résumé | (disponible en anglais seulement)
For groundwater studies, the collection of sediment geochemistry is often beyond the scope, and budget of many programs, and is generally not included as part
of routine data collection. Portable x-ray fluorescence spectrometer (pXRF) has proven to be a successful tool to characterize the chemostratigraphy of glacial derived materials collected from boreholes in southern Ontario. Portable XRF provides
near-total geochemistry results similar to fusion and multi-acid methods for 14 elements with minimal sample preparation and at low cost. An extensive suite of near surface samples provides characterization of the regional geochemistry. In a
collaborative project with the OGS and the GSC two transects are being completed (E-W, N-S) to provide a framework of subsurface geochemistry. To eliminate the effects of variability in sample grain-size, sample volume, and to minimize nugget
effects, samples are dried and sieved to <0.063 mm (silt + clay) prior to analysis. To ensure quality control, a number of Standard Reference Materials (SRM) and Certified Reference Materials (CRM) are analyzed with each project, and comparisons made
with previously published results. For further quality control, a sub-suite of sediment samples are analyzed by ICP-MS/ES using lithium borate fusion, multiacid, and aqua regia digestions.
Bivariate plots comparing pXRF to ICP-MS/ES display a high
degree of linearity (r2 > 0.8) for Ca, Fe, K, Mn, Rb, Sr, V, Zn, Zr, and to a lesser degree for Ba, Cu, Cr, Ti, and Pb. These 14 elements return precise and generally accurate results within each borehole; however, continued analyses of CRM's and
SRM's has demonstrated display drift in accuracy between projects. Resulting data for meet the US EPA criteria for quantitative data quality based on r2 values and y=mx+b relationships. Concentration levels play a significant factor in the accuracy
of the pXRF data. At low concentration levels near the detection limit of the pXRF, there can be greater scatter in results. At high concentration levels, data needs to be adjusted using post-data calibration to obtain accurate results. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Procès-verbaux pour la géoscience des eaux souterraines à échelle régionale Organisée par la Commission géologique de l'Ontario, la Commission
géologique du Canada et les géoscientifiques de Conservation Ontario. La journée portes ouvertes est prévue pour 2017-03-01 et 02. L'objectif est l'engagement du public et la diffusion de la géoscience dans le sud de l'Ontario au cours de la dernière
année. |
| GEOSCAN ID | 299780 |
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