| Titre | Neoproterozoic-Cambrian stratigraphy of the Mackenzie Mountains, northwestern Canada, part I: Ediacaran measured sections and updated lithostratigraphy, NE Sekwi Mountain map area (NTS 105-P) |
| Télécharger | Téléchargements |
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| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | MacNaughton, R B |
| Source | Commission géologique du Canada, Dossier public 7315, 2020, 22p., https://doi.org/10.4095/327237  Accès ouvert |
| Image |  |
| Année | 2020 |
| Séries alt. | Northwest Territories Geological Survey Contribution 0145 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/327237 |
| Media | en ligne; numérique |
| Référence reliée | Photo(s)
de RNCan dans cette publication |
| Référence reliée | Cette publication est reliée à les publications suivantes |
| Formats | pdf |
| Province | Territoires du Nord-Ouest |
| SNRC | 105P/15; 105P/16 |
| Région | Mackenzie Mountains; Sekwi Mountain; Godlin River |
| Lat/Long OENS | -129.0000 -128.0000 64.0000 63.7500 |
| Sujets | Cambrien inférieur; stratigraphie systématique; analyses stratigraphiques; nomenclature stratigraphique; corrélations stratigraphiques; lithostratigraphie; géologie du substratum rocheux; lithologie;
roches sédimentaires; dolomies; grès; arénites; silstones; schistes; carbonates; structures sédimentaires; Cordillère canadienne; Néoprotérozoïque; Formation de Backbone Ranges ; Formation de Gametrail ; Formation de Sheepbed ; Formation de Risky ;
géologie régional; stratigraphie; Sciences et technologie; Nature et environnement; Phanérozoïque; Paléozoïque; Cambrien; Précambrien; Protérozoïque |
| Illustrations | cartes de localisation; cartes géolscientiques généralisées; diagrammes stratigraphiques; diagraphies lithologiques; photographies; tableaux |
| Programme | GEM2 : La géocartographie de l'énergie et des minéraux Corridor de Mackenzie |
| Diffusé | 2020 09 30 |
| Résumé | (disponible en anglais seulement)
This report updates Ediacaran stratigraphic assignments in the northeastern part of NTS map area 105-P (Sekwi Mountain map area). A previous report (MacNaughton
et al., 2008) included graphic logs for three measured sections in this region. The sections were thought to encompass the uppermost part of the Sheepbed Formation, a platform facies of the Gametrail Formation, the lower and middle members of the
Backbone Ranges Formation, and the basal part of the upper member of the Backbone Ranges Formation. The sections were considered to span much of the Ediacaran and possibly the basal Cambrian. Based on more recent bedrock mapping, as well as revisions
to regional stratigraphic correlations, the measured sections from the earlier report are reassessed. An interval previously treated as a sandy, shallow-marine upper part of the otherwise shale-dominated Sheepbed Formation is reassigned to the lower
member of the Backbone Ranges Formation. The contact between the two units corresponds to an upward change from dark grey to brown or rusty weathering colours. In the area where the sections were measured, the 'Sheepbed carbonate' is not present at
the Sheepbed-Backbone Ranges contact, nor is the shale-rich Nadaleen Formation (a.k.a. 'June beds'), although these units are commonly present at this level in other parts of the Mackenzie Mountains. A thick package of shallow-marine, grey sandy
dolostone and dolomitic sandstone, previously assigned to the Gametrail Formation is also placed in the lower member of the Backbone Ranges Formation, based on comparison with other sections regionally. In light of recent studies, measured strata in
the basal part of the upper member of the Backbone Ranges Formation probably are Ediacaran rather than Cambrian. Previously unpublished descriptive notes are provided for the three measured sections. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Ce rapport a deux objectifs. Premièrement, le rapport place dans le domaine public des notes descriptives inédites qui ont servi de base à un
rapport antérieur de la CGC, publié en 2008. Ils fournissent des données de base importantes pour plusieurs unités géologiques d'âge Ediacaran dans les monts Mackenzie, aux TN-O. Deuxièmement, le rapport met à jour certaines conclusions de l'article
de 2008 pour refléter des études plus récentes dans les monts Mackenzie effectuées par des chercheurs universitaires et par la Commission géologique du Canada. |
| GEOSCAN ID | 327237 |
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