| Titre | Constraints on large-scale geological processes from small-scale magnetotelluric imaging in the Kaskattama Highlands, northeastern Manitoba, Canada |
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| Auteur | Ferguson, I; Craven, J; Roberts, B; McLeod, J; Clark, N; Zaporozan, T; Hodder, T; Nicolas, M |
| Source | 27th IUGG General Assembly, 2019, Montreal, Canada: abstracts; IUGG19-1630, 2019 p. 1  Accès ouvert |
| Liens | Online - En ligne (complete volume - volume complet, ZIP, 85.4
MB)
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| Année | 2019 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190418 |
| Éditeur | International Union of Geodesy and Geophysics |
| Réunion | 27th IUGG General Assembly; Montreal, QC; CA; juillet 8-18, 2019 |
| Document | fichier d'ordinateur |
| Lang. | anglais |
| Media | en ligne; numérique |
| Formats | pdf; html |
| Province | Manitoba |
| SNRC | 54A/05; 54A/11; 54A/12; 54A/13; 54A/14; 54B; 54G/01; 54G/02; 54G/03; 54G/04 |
| Région | Kaskattama River |
| Lat/Long OENS | -92.0000 -89.0000 57.2500 56.0000 |
| Sujets | levés géophysiques; levés magnétotelluriques; géologie du substratum rocheux; lithologie; roches sédimentaires; schistes; analyses du comportement des surfaces; antécédents géologiques; antecedents de
sedimentation; antécédents tectoniques; cadre tectonique; affaissement; Zone de Superior Boundary ; tectonique; géophysique; Sciences et technologie; Nature et environnement; Phanérozoïque; Mésozoïque; Crétacé; Précambrien |
| Programme | GEM2 : La géocartographie de l'énergie et des minéraux Géophysique du Mont Southampton et des hauts plateaux de Kaskattama de la région
d' Hudson/Ungava |
| Diffusé | 2019 07 01 |
| Résumé | (disponible en anglais seulement)
A 22 site magnetotelluric (MT) survey conducted in the Kaskattama Highlands, northeastern Manitoba, Canada, in summer 2017 as part of the Canadian GEM 2 program
provides good resolution of an underlying Cretaceous shale unit. The shale occurs in an area where a drill-hole reveals anomalous Paleozoic stratigraphy including the presence of the shale and absence of some Silurian units. Underlying Precambrian
basement rocks include the Fox River Belt of the Superior Boundary Zone, close to its truncation by the Winisk River Fault. The shale unit has a resistivity of 9 ?.m and a moderately uniform conductance (thickness-conductivity product) across the
survey area. MT results show the unit extends 15 to 30 km in the northwest-southeast direction beneath the highlands and at least 20 km in the southwest-northeast direction. Collectively, the results suggest the shale has a marine source. Mesozoic to
Cenozoic sediments occur locally in Hudson Bay and the current study provides evidence for a larger distribution of such sediments and of postulated periodic connections with other marine domains. The results provide evidence of localized
post-Silurian, pre-Cretaceous uplift, causing the erosion of Silurian units, and subsequent post-Cretaceous subsidence to preserve the shale unit. The interpreted vertical tectonic processes may be attributed to large-scale Phanerozoic reactivation
on the Superior Boundary Zone or the Winisk River Fault, and/or possibly to processes associated with Cretaceous mantle plume activity. |
| GEOSCAN ID | 321693 |
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