Late Ordovician (Chatfieldian) catastrophic volcanism and abrupt carbonate platform-interior subsidence: A tectonic link across a Taconian foreland basin (Quebec Embayment) due to inherited crustal weakness
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Résumé
Research Article| September 01, 2011 Late Ordovician (Chatfieldian) catastrophic volcanism and abrupt carbonate platform-interior subsidence: A tectonic link across a Taconian foreland basin (Québec Embayment) due to inherited crustal weakness George R. Dix; George R. Dix † Ottawa-Carleton Geoscience Centre and Department of Earth Sciences, 2160 Herzberg Laboratories, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada †E-mail: gdix@connect.carleton.ca Search for other works by this author on: GSW Google Scholar M.J. Al-Dulami M.J. Al-Dulami Ottawa-Carleton Geoscience Centre and Department of Earth Sciences, 2160 Herzberg Laboratories, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information George R. Dix † Ottawa-Carleton Geoscience Centre and Department of Earth Sciences, 2160 Herzberg Laboratories, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada M.J. Al-Dulami Ottawa-Carleton Geoscience Centre and Department of Earth Sciences, 2160 Herzberg Laboratories, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada †E-mail: gdix@connect.carleton.ca Publisher: Geological Society of America Received: 15 Jul 2010 Revision Received: 18 Nov 2010 Accepted: 06 Dec 2010 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2011 Geological Society of America GSA Bulletin (2011) 123 (9-10): 1988–2004. https://doi.org/10.1130/B30371.1 Article history Received: 15 Jul 2010 Revision Received: 18 Nov 2010 Accepted: 06 Dec 2010 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation George R. Dix, M.J. Al-Dulami; Late Ordovician (Chatfieldian) catastrophic volcanism and abrupt carbonate platform-interior subsidence: A tectonic link across a Taconian foreland basin (Québec Embayment) due to inherited crustal weakness. GSA Bulletin 2011;; 123 (9-10): 1988–2004. doi: https://doi.org/10.1130/B30371.1 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 SocietyGSA Bulletin Search Advanced Search Abstract The Late Ordovician Trenton Group of New York State and equivalent strata in south-central Canada peripheral to the Québec Embayment form a regional carbonate platform succession within the Taconian foreland basin. The upper and lower group boundaries record geodynamically controlled changes in regional subsidence, whereas a higher-order allocyclic stratigraphy traced south along the foreland interior of the eastern United States may identify shorter-term eustatic controls. A tectonomagmatic event extending across the foreland basin is recorded a few million years prior to the regional collapse of the foreland platform in the Québec Embayment, within the lower C. spiniferus (graptolite) Zone. Platform-margin retreat (∼50 km) in southern Québec is contemporaneous with a shale-rich limestone succession that thins (∼30–10 m) westward over ∼300 km into the Ottawa Embayment, eastern Ontario, west of the Appalachian structural front. This stratigraphic record coincides with catastrophic volcanism within the once distant volcanic arc terranes as recorded by a bentonite traced geophysically from the platform margin to the Michigan Basin. Core from the Ottawa Embayment demonstrates western-directed transport of lithic-bearing ash. The lithic material, representing reworked deep-water sedimentary and/or volcaniclastic sediment, was entrained by eruption of calc-alkaline felsic to basaltic andesitic, and trachyandesitic magmatic sources. The above geological history documents a short period of diminishing influence of subsidence moving into the platform interior—an event that enhanced, briefly, cross-platform oceanographic circulation as recorded by elevated shale abundance and change in macrofaunal assemblages. Short-lived differential subsidence of the continental crust in this region, in response to distal tectonism, may have been predicated by inherited weakness of a shallowly buried intracratonic (>400km) Precambrian fault system, manifest today by the Ottawa-Bonnechère Graben. The resulting thin (<10- to 30-m) stratigraphic record of the tectonomagmatic event is of similar thickness to high-order allostratigraphic patterns within the Taconic foreland interior of the eastern United States. Because there is a heterogeneous distribution of Precambrian fault systems underlying the Taconian foreland interior of eastern Laurentia, differential structural response of the foreland interior can be anticipated. The apparent regional allostratigraphy may contain subtle facies differences along the strike of the foreland basin that reflect this tectonic component. 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 machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,002 | 0,004 |
| Études des sciences et des technologies | 0,002 | 0,001 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,000 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,009 | 0,001 |
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 source (Gemma direct ou Codex distillé), 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 ».