A pericratonic model for the Pearya terrane as an extension of the Franklinian margin of Laurentia, Canadian Arctic
Bibliographic record
Abstract
Research Article| January 01, 2014 A pericratonic model for the Pearya terrane as an extension of the Franklinian margin of Laurentia, Canadian Arctic T. Hadlari; T. Hadlari † 1Geological Survey of Canada, 3303 33rd Street NW, Calgary, Alberta T2L 2A7, Canada †E-mails: thomas.hadlari@nrcan.gc.ca; bill.davis@nrcan.gc.ca; keith.dewing@nrcan.gc.ca. Search for other works by this author on: GSW Google Scholar W.J. Davis; W.J. Davis † 2Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada †E-mails: thomas.hadlari@nrcan.gc.ca; bill.davis@nrcan.gc.ca; keith.dewing@nrcan.gc.ca. Search for other works by this author on: GSW Google Scholar K. Dewing K. Dewing † 1Geological Survey of Canada, 3303 33rd Street NW, Calgary, Alberta T2L 2A7, Canada †E-mails: thomas.hadlari@nrcan.gc.ca; bill.davis@nrcan.gc.ca; keith.dewing@nrcan.gc.ca. Search for other works by this author on: GSW Google Scholar GSA Bulletin (2014) 126 (1-2): 182–200. https://doi.org/10.1130/B30843.1 Article history received: 19 Dec 2012 rev-recd: 17 Jul 2013 accepted: 17 Aug 2013 first online: 08 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. Hadlari, W.J. Davis, K. Dewing; A pericratonic model for the Pearya terrane as an extension of the Franklinian margin of Laurentia, Canadian Arctic. GSA Bulletin 2014;; 126 (1-2): 182–200. doi: https://doi.org/10.1130/B30843.1 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 New detrital zircon sensitive high-resolution ion microprobe (SHRIMP) geochronology and published framework geology of Neoproterozoic to Silurian strata are integrated to reexamine tectonic models of the Pearya terrane and the Franklinian margin at Ellesmere Island, Arctic Canada. Compared to Cambrian detrital zircon reference spectra, Neoproterozoic sandstones from the Pearya terrane contain Laurentian detrital zircon ages. In fact, they compare very well with Neoproterozoic strata of Greenland. Ultramafic, tholeiitic, and andesitic basalts of the Maskell Inlet complex, inferred to have an age of ca. 481 Ma, predate the M'Clintock orogeny at ca. 475 Ma. Ordovician granitoid ages within the Pearya terrane span ca. 475–463 Ma. A K-Ar cooling age of 452 Ma records post-tectonic exhumation. Deposited at ca. 450 Ma, new data show that the Cape Discovery Formation contains mainly ca. 500–450 Ma detrital zircon ages, but also older ages of 660–620 Ma. Upper Ordovician sandstones indicate that the Pearya terrane platform continued to receive near-syndepositional zircon. The Pearya terrane platform was submerged at ca. 435 Ma and overlain by Silurian flysch fed by sources similar to detrital zircon within Proterozoic to Ordovician strata of the Pearya terrane. Ties between the Pearya terrane and the Franklinian shelf include: similar Proterozoic-Cambrian stratigraphy; detrital zircon ages from the Lower Cambrian Grantland Formation that appear to be a combination of recycled Marinoan strata of Pearya terrane and Franklinian shelf strata; and profound unconformities on the Franklinian shelf that correlate temporally to the M'Clintock orogeny.A pericratonic model is a straightforward solution to the tectonic history of the Pearya terrane and the Franklinian shelf. We hypothesize that the Pearya terrane was part of the Franklinian margin in the Neoproterozoic and that the intervening deep water basin, or Hazen Trough, originated as a failed rift. The Maskell Inlet complex records ca. 481 Ma volcanism as a response to mantle upwelling beneath a subducting slab, shortly before or as the continent-ocean transition zone of the Franklinian margin was over-ridden. Continued convergence and crustal thickening during arc-continent collision drove the M'Clintock orogeny at ca. 475 Ma and resulted in the unconformities on the Franklinian shelf. After arc-continent collision, magmatism between ca. 475 and 438 Ma was related to subduction on the outboard margin, and the Pearya terrane was overlain by a low-accommodation retroarc foreland basin. A subsequent collisional event led to progressive drowning of the Pearya terrane and Franklinian platforms between 435 and 425 Ma. Silurian flysch then blanketed the Pearya terrane and entered the axis of the foreland basin, which also received sediment from cratonic sources of the flexural basin margin. Limited deformation at northern Axel Heiberg Island was associated with a ca. 390 Ma granitoid within the Pearya terrane. After a Devonian pulse of subsidence, infilling of the basin to form the Devonian clastic wedge overlapped in age with small ca. 368 Ma granitic intrusions within the Pearya terrane and was followed by extensive foreland deformation of the Late Devonian–Mississippian Ellesmerian orogeny. 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 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.003 | 0.003 |
| Scholarly communication | 0.003 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.010 | 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".