Palaeogeographic setting, lithostratigraphy, and sedimentary framework of the Lower Triassic Montney Formation of western Alberta and northeastern British Columbia
Notice bibliographique
Résumé
Abstract The subsurface Montney Formation records deposition through the Lower Triassic interval on the northwestern margin of the North American craton. Various evidence, including stratigraphic architecture, the presence of late Paleozoic and Mesozoic zircons and sediment geochemistry support the contention that the Montney is a product of deposition in a collisional retro-foreland basin setting. The Montney is formally divided into eight regionally extensive members on the basis of lithology, mineralogy and well log character. Three of these, the Lower Montney Member, Middle Montney Member and Upper Montney Member are similar to informal units used by industry geoscientists. The boundaries of these units coincide with major stage boundaries (Dienerian-Smithian and Smithian-Spathian). Three new members are provided for carbonate-dominated units in the Montney Formation. The Pocketknife Member, formerly referred to as the Claraia zone), consists of bituminous, planar-laminated siltstone with abundant thin-shelled bivalves and thin bioclastic packstone beds. It occurs interbedded with the Lower Montney Member. The Anten Coquina Member (formerly the informal coquinal dolomite middle member) occurs in the eastern part of the Montney basin (near the subcrop limit) and consists of bioclastic grainstone dominated by fragmentary, disarticulated bivalves, gastropods and lingulide brachiopods that occurs coincident with the Dienerian-Smithian boundary. The Altares Member consists of interbeds of bioclastic packstone and grainstone with bituminous dolomitic siltstone and occurs interbedded with the upper part of the Middle Montney Member in the west-central part of the basin. Two sandstone-dominated members are also named. The Calais Sandstone Member occurs near the base of the Montney and consists of well-sorted cross-stratified fine-grained sandstone. The LaGlace Sandstone Member occurs near the base of the Middle Montney Member. Both sandstone members are of turbidite origin and occur primarily within the Peace River embayment (sensu stricto) area. Dominated by subangular to subrounded quartz silt and a low overall proportion of clay and high proportion of detrital dolomite and feldspar, the Montney is compositionally and texturally unique in Western Canada. Although fine-grained siliciclastic sediment dominates, dolomite occurs throughout the Montney Formation and several regionally extensive bioclastic packstone and grainstone horizons occur. Montney deposition records a low-relief clastic ramp succession deposited in an arid coastal setting and includes units deposited in a variety of shallow marine and turbidite lobe / channel settings. The Montney’s unique mineralogical and textural composition is a function of both the demise of Palaeozoic carbonate-secreting organisms and deposition in an arid coastal setting fed by rare perennial, and abundant ephemeral, fluvial systems.
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 | 0,001 |
| 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) | 0,001 | 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 ».