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
Bibliographic record
Abstract
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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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.004 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.009 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".