| Titre | Developing the bedrock layer for Canada 3-D: the Precambrian-Phanerozoic boundary |
| Télécharger | Téléchargements |
| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | de Kemp, E A; Schetselaar, E M; Hillier, M; Montsion, R |
| Source | Commission géologique du Canada, Présentation scientifique 65, 2017, 1 feuille, https://doi.org/10.4095/301671 (Accès ouvert) |
| Image |  |
| Année | 2017 |
| Éditeur | Ressources naturelles Canada |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/301671 |
| Media | en ligne; numérique |
| Formats | pdf |
| Province | Canada; Colombie-Britannique; Alberta; Saskatchewan; Manitoba; Ontario; Québec; Nouveau-Brunswick; Nouvelle-Écosse; Île-du-Prince-Édouard; Terre-Neuve-et-Labrador; Territoires du Nord-Ouest; Yukon;
Nunavut |
| SNRC | 1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65;
66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560 |
| Lat/Long OENS | -141.0000 -50.0000 90.0000 41.7500 |
| Sujets | zones tectonostratigraphiques; établissement de modèles; techniques de cartographie; géologie du substratum rocheux; géologie du socle; trous de forage; données sismiques; levés de reflexion sismiques;
levés de refraction sismiques; géostatistiques; discordances; érosion; glaciation; déformation; structure de la croûte; caractéristiques structurales; failles; Bassin d'Hudson Bay ; Bassin sédimentaire de l'ouest du Canada; Bassin de Williston ;
Bouclier Canadien; Orogène Appalachien; Cordillère canadienne; méthodologie; traitement des données; stratigraphie; géomathématique; Phanérozoïque; Précambrien |
| Illustrations | geoscientific sketch maps; 3-D models; photographs; histograms; schematic cross-sections; block diagrams; tables; flow diagrams; schematic representations |
| Programme | Bureau du Directeur Général de la CGC, Direction du Centre et du Nord du Canada, Initiative ouverte géoscientifique |
| Diffusé | 2017 06 13 |
| Résumé | (disponible en anglais seulement)
One of the most significant tectonostratigraphic features of the geology of Canada is the boundary separating 'cover' rocks of the Phanerozoic Eon and older
'basement' rocks; dominantly metamorphic and crystalline rocks of the Precambrian shield. In the context of the Canada-3D initiative to develop a 3D geological model of Canada from the surface to the Moho, we have begun to integrate data constraints
for modelling this boundary, including geological map, drillhole and seismic data. The 3D surface development is being undertaken through the application of data (geostatistical, implicit modelling (GOCAD/SKUA and SURFE) and knowledge (SPARSE)
driven methods. More accurate 3D delineation of this key boundary will help support applications such as the separation of bulk rock properties into cover and basement classes which could in turn be used for geophysical and mineral potential
modelling. Coupled with heat flow and fracture density estimates; it could also contribute to future development of national-scale 3D favourability maps for geothermal energy and CO2 sequestration potential. The project combines a large amount of
data from various sources collected over the last 175 years since the initiation of geological mapping by the Geological Survey of Canada in 1842 by Sir William Logan.
The Precambrian-Phanerozoic boundary is dominantly an angular unconformity
between the crystalline bedrock of the Canadian Shield and Phanerozoic sedimentary cover sequences, spanning a hiatus of several hundreds of millions to more than two billion years. In rare cases such as the Rapitan Group in the Mackenzie Mountains,
it is a more conformable stratigraphic contact between Neoproterozoic and Cambrian formations. There are also many parts of Canada's subsurface which have no geologic record of the boundary where the crust is mainly composed of either younger
Paleozoic and Mesozoic mobile belts (Central Newfoundland and British Columbia), or exposed basement of the Precambrian Shield. The geological data that constrain the Precambrian-Phanerozoic interval are spatially heterogeneous, and vary in quality
from excellent observations from petroleum wells in the Western Canada and Williston Basins, to less reliable well logs in Southern Ontario, to interpretive map traces in the overburden covered Hudson Bay low lands. Seismic reflection and refraction
data from Lithoprobe and industry surveys will support deeper interpretations of the boundary, and be integrated with constraints obtained by geological mapping in the more complex regions of the Canadian Cordillera and Appalachian orogens. Canada-3D
is modelling other tectonostratigraphic features (crustal scale fault networks and major lithostratigraphic horizons) within the bedrock layer, above and below the Precambrian-Phanerozoic boundary, but by focusing early on this significant boundary
we gain insight to the data distribution, the required methodology and processing gaps that exist tackling this problem at a national scale. As the project proceeds there will be a need for development of 3D tools to support uncertainty estimation,
sparse data interpolation and extension, and interpretation workflows designed to cope with the many challenges presented by limited sampling of complex geologic terrains. |
| Résumé | (Résumé en langage clair et simple, non publié)
L'une des caractéristiques tectonostratigraphiques les plus importantes de la géologie du Canada est la frontière qui sépare les roches de
«couverture» de l'Eon Phanerozoïque et des roches plus anciennes de «sous-sol»; Des roches métamorphiques et cristallines dominantes du bouclier précambrien. Dans le cadre de l'initiative Canada-3D visant à développer un modèle géologique 3D du
Canada de la surface au Moho, nous avons commencé à intégrer les contraintes de données pour la modélisation de cette limite, y compris la carte géologique, les données de forage et les données sismiques. Ce projet aidera à soutenir des applications
telles que la séparation des propriétés de la pierre en vrac en classes de couverture et de sous-sol qui pourraient à leur tour être utilisées pour la modélisation géophysique, la chaleur et les estimations de la densité des fractures, des cartes de
favorabilité 3D pour l'énergie géothermique et le potentiel de séquestration du CO2. Le projet combine une grande quantité de données provenant de diverses sources recueillies au cours des 175 dernières années depuis le lancement de la cartographie
géologique par la Commission géologique du Canada en 1842 par Sir William Logan. |
| GEOSCAN ID | 301671 |
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