Subsurface Proterozoic stratigraphy and tectonics of the western plains of the Northwest Territories
Notice bibliographique
Résumé
Reflection seismic records from the northwestern plains of the Northwest Territories reveal about 14 km of Proterozoic strata deformed to varying degrees, including spectacular large-scale faults and folds. The Proterozoic section, subdivided into four seismic assemblages representing five unconformity-bounded sequences, can be reasonably correlated with outcropping strata on Coppermine Homocline and Brock Inlier to the east and in the Cordillera to the west. Correlations are based largely on recognizing similar stratigraphic and tectonic histories. The HB Assemblage at the base of the subsurface stratigraphic column contains two unconformity-bounded sequences, the lower of which is correlated with the Bigbear and Fault River formations (of the Hornby Bay Group) on Coppermine Homocline, and with the Wernecke Supergroup in the Cordillera. The upper sequence, comprising the Basinal, Platformal, and Syntectonic units (of the HB Assemblage), is correlated with the deltaic Lady Nye Formation, platformal East River Formation, and syntectonic Kaertok and LeRoux formations, (of the Hornby Bay Group) on Coppermine Homocline, but has no known correlatives in the Cordillera. The DL Assemblage is the third sequence and is correlated with the Dismal Lakes Group on Coppermine Homocline, and the Pinguicula Group in the Cordillera. The fourth sequence, the Tweed Lake Assemblage, is correlated with the Coppermine River Group on Coppermine Homocline (a correlation supported by chemical analyses of basalts) and has no known correlative in the Cordillera. The fifth and stratigraphically highest sequence, the M/S Assemblage, is correlated with the Shaler Supergroup on Coppermine Homocline, and the Mackenzie Mountains Supergroup and Hematite Creek Group in the Cordillera (correlations that are supported by the presence of 'Grenville-age' detrital zircons, and macro- and microfossils). The subsurface tectonic history includes compressional and extensional events, and parallels remarkably well the history of Coppermine Homocline. The most important compressional event, the thick-skinned, intracratonic Forward Orogeny, identified in the subsurface and on Coppermine Homocline, is probably related to the Racklan Orogeny, identified in the Wernecke Mountains of the Cordillera. Forward Orogeny basement-cored structures affected HB Assemblage and older strata and were peneplaned by regional erosion before deposition of the DL Assemblage and correlative strata. The most important extensional event postdated DL Assemblage deposition and occurred primarily as a reactivation of Forward Orogeny faults. Other structures include early extensional faults related to Basinal Unit subsidence, and late, long-wavelength folds affecting the Tweed Lake Assemblage, M/S Assemblage, and correlative strata. Strong, discordant seismic reflections are mostly interpreted as representing intrusive sheets that are correlated with Western Channel Diabase sheets on Coppermine Homocline. Younger sheets imaged in M/S Assemblage strata are correlated with the Tsezotene sills exposed in the Mackenzie Mountains. The Cambrian Mackenzie Trough, grabens and half-grabens developed at various times (Early Cambrian, post-Devonian/ pre-Cretaceous, and post-Cretaceous), the transpressional (Laramide?) Colville Hills, and the Laramide Imperial Anticline, are all Phanerozoic elements whose development was influenced by Proterozoic history.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».