Zircon provenance data record the lateral extent of pancontinental, early Neoproterozoic rivers and erosional unroofing history of the Grenville orogen
Bibliographic record
Abstract
Research Article| June 30, 2017 Zircon provenance data record the lateral extent of pancontinental, early Neoproterozoic rivers and erosional unroofing history of the Grenville orogen Robert H. Rainbird; Robert H. Rainbird † 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada †rob.rainbird@canada.ca Search for other works by this author on: GSW Google Scholar N.M. Rayner; N.M. Rayner 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Search for other works by this author on: GSW Google Scholar T. Hadlari; T. Hadlari 2Geological Survey of Canada, 3303 33rd Street NW, Calgary, Alberta T2L 2A7, Canada Search for other works by this author on: GSW Google Scholar L.M. Heaman; L.M. Heaman 3Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada Search for other works by this author on: GSW Google Scholar A. Ielpi; A. Ielpi 4Department of Earth Sciences, Laurentian University, Sudbury, Ontario P3E 2C6, Canada Search for other works by this author on: GSW Google Scholar E.C. Turner; E.C. Turner 4Department of Earth Sciences, Laurentian University, Sudbury, Ontario P3E 2C6, Canada Search for other works by this author on: GSW Google Scholar R.B. MacNaughton R.B. MacNaughton 2Geological Survey of Canada, 3303 33rd Street NW, Calgary, Alberta T2L 2A7, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Robert H. Rainbird † 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada N.M. Rayner 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada T. Hadlari 2Geological Survey of Canada, 3303 33rd Street NW, Calgary, Alberta T2L 2A7, Canada L.M. Heaman 3Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada A. Ielpi 4Department of Earth Sciences, Laurentian University, Sudbury, Ontario P3E 2C6, Canada E.C. Turner 4Department of Earth Sciences, Laurentian University, Sudbury, Ontario P3E 2C6, Canada R.B. MacNaughton 2Geological Survey of Canada, 3303 33rd Street NW, Calgary, Alberta T2L 2A7, Canada †rob.rainbird@canada.ca Publisher: Geological Society of America Received: 04 Nov 2016 Revision Received: 22 Feb 2017 Accepted: 24 Apr 2017 First Online: 30 Jun 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2017 Geological Society of America GSA Bulletin (2017) 129 (11-12): 1408–1423. https://doi.org/10.1130/B31695.1 Article history Received: 04 Nov 2016 Revision Received: 22 Feb 2017 Accepted: 24 Apr 2017 First Online: 30 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Robert H. Rainbird, N.M. Rayner, T. Hadlari, L.M. Heaman, A. Ielpi, E.C. Turner, R.B. MacNaughton; Zircon provenance data record the lateral extent of pancontinental, early Neoproterozoic rivers and erosional unroofing history of the Grenville orogen. GSA Bulletin 2017;; 129 (11-12): 1408–1423. doi: https://doi.org/10.1130/B31695.1 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 We present detrital zircon U-Pb data from mainly fluvial sandstones of the Mackenzie Mountains Supergroup, Yukon (four samples), and the Shaler Supergroup, Northwest Territories (seven samples). The high similarity of data sets from widely separated units supports long-held stratigraphic correlations between the late Mesoproterozoic–Neoproterozoic Mackenzie and Amundsen basins. The breadth of the inferred fluvial system was at least 1200 km, much wider than any modern fluvial system on Earth. Zircon ages show mainly local provenance at the base of the Shaler Supergroup, with the gradual up-section introduction of more distal sources that closely match the ages of magmatic rocks characterizing the Grenville and Granite-Rhyolite Provinces of eastern and southern Laurentia, respectively. Two episodes of siliciclastic influx, represented by the Escape Rapids Formation and the younger Nelson Head Formation (Rae Group), correspond with periods of uplift and erosional unroofing that would have followed the two main phases of the Grenvillian orogeny, the Shawinigan (ca 1200–1140 Ma) and the Ottawan (ca 1090–1050 Ma). Carbonate rocks of the intervening Mikkelsen Islands Formation, and possibly correlative Tabasco Formation of the Mackenzie basin, are interpreted to record an interval of tectonic quiescence and subdued siliciclastic influx. Our work establishes a detrital zircon reference for late Mesoproterozoic–Neoproterozoic strata of northern Laurentia that is comparable with that of coeval sequences from the circum–North Atlantic region. These strata could have been deposited in similarly large interior basins, possibly connected to the Amundsen-Mackenzie and Borden basins. Such a paleogeographic scenario was likely only possible during a time of continental aggregation (e.g., supercontinent Rodinia), when orogenic belts extended between adjacent continental blocks and huge basins lay within the supercontinent's interior. 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 | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.007 | 0.011 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.019 | 0.008 |
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".