Alluvial architecture of the Horsefly unit (Basal Quartz) in southern Alberta and northern Montana: influence of accommodation changes and comtemporaneous faulting
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Résumé
Research Article| March 01, 2002 Alluvial architecture of the Horsefly unit (Basal Quartz) in southern Alberta and northern Montana: influence of accommodation changes and comtemporaneous faulting T.D. Lukie; T.D. Lukie Nexen Canada Limited, 801 - 7 Avenue SW, Calgary, AB T2P 3P7 Search for other works by this author on: GSW Google Scholar G.W. Ardies; G.W. Ardies EnCana Corporation, 150 - 9 Avenue SW, Calgary, AB T2P 2S5 Search for other works by this author on: GSW Google Scholar R. W. Dalrymple; R. W. Dalrymple Department of Geological Science, and Geological Engineering, Queen's University, Kingston, ON K7L 3N6 Search for other works by this author on: GSW Google Scholar B.A. Zaitlin B.A. Zaitlin EnCana Corporation, 150-9 Avenue SW, Calgary, AB T2P 2S5 Search for other works by this author on: GSW Google Scholar Bulletin of Canadian Petroleum Geology (2002) 50 (1): 73–91. https://doi.org/10.2113/50.1.73 Article history received: 18 May 2001 accepted: 17 Sep 2001 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation T.D. Lukie, G.W. Ardies, R. W. Dalrymple, B.A. Zaitlin; Alluvial architecture of the Horsefly unit (Basal Quartz) in southern Alberta and northern Montana: influence of accommodation changes and comtemporaneous faulting. Bulletin of Canadian Petroleum Geology 2002;; 50 (1): 73–91. doi: https://doi.org/10.2113/50.1.73 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of Canadian Petroleum Geology Search Advanced Search Abstract The Basal Quartz (Early Cretaceous) consists of a nested succession of mineralogically distinct, unconformity-bounded units. The second oldest of these, the Horsefly sandstone, occupies a broad (28–52 km wide), north-south trending, flat-floored valley (the Taber-Cutbank valley) in northern Montana and southern Alberta (south of Township 15) that has a maximum relief of 50 m. The valley-fill deposits are entirely fluvial in origin. Two internal sequences are recognized. Each begins with a regional erosion surface and sheet sandbody consisting of amalgamated channel sandstones. Contemporaneous overbank sediments (now represented by mudstone-pebble conglomerates) were completely eroded. These sandstones are overlain by mudstone-dominated deposits which consist mainly of red vertisols and contain isolated, ribbon channel sandstones and sheet sandstones formed by crevasse splays. Each sequence accumulated under conditions of continuously increasing accommodation space. Tectonic movements, perhaps in response to episodic thrust loading, are thought to be the major control on accommodation; eustatic fluctuations were probably not important because the study area lay far inland at the time of deposition.Syndepositional block faulting partially overprinted the regional changes in accommodation, producing constrictions in the valley at the location of cross-valley uplifts; slightly greater uplift of the northern part of the valley caused an overall down-stream narrowing. Local areas of greater subsidence trapped the northward-moving, extrabasinal gravel, accelerating the proximal distal fining trend. Such areas also tend to display evidence of higher water tables, including the preservation of organic-rich deposits, and to contain a higher number of channel sandstones because the rivers preferentially avoided the subtly uplifted areas. This study shows that the influence of subtle faulting can be significant during times of limited accommodation because it is not masked by rapid sedimentation. This content is PDF only. Please click on the PDF icon to access. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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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) | 0,001 | 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 ».