Bibliographic record
Abstract
Research Article| August 01, 2003 Tightening the Siberian connection to western Laurentia James W. Sears; James W. Sears 1Department of Geology, University of Montana, Missoula, Montana 59812, USA Search for other works by this author on: GSW Google Scholar Raymond A. Price Raymond A. Price 2Department of Geological Sciences, Queen's University, Kingston, Ontario K7L3N6, Canada Search for other works by this author on: GSW Google Scholar GSA Bulletin (2003) 115 (8): 943–953. https://doi.org/10.1130/B25229.1 Article history received: 04 Aug 2002 rev-recd: 27 Feb 2003 accepted: 04 Mar 2003 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 James W. Sears, Raymond A. Price; Tightening the Siberian connection to western Laurentia. GSA Bulletin 2003;; 115 (8): 943–953. doi: https://doi.org/10.1130/B25229.1 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 Newly available geological and geophysical data tighten the Proterozoic connection between the rifted margins of the northern Siberian craton and western Laurentia, and permit a Siberia-Laurentia-Australia troika, with northern Australia connected to the southern margin of the Siberian craton. The continental assembly is linked by a prominent 2.0–1.8 Ga collisional belt and the ca. 1.3–1.0 Ga Grenville orogen. The reconstruction also aligns a 1.5–1.45 Ga dike/sill swarm that extends from the Wyoming province, through the Belt-Purcell basin, into the northern Siberian craton. Separation of Australia and Siberia may have occurred by the early Neoproterozoic, but separation of Siberia and Laurentia may not have been completed until the Early Cambrian. Continental extension began along the zigzag Siberia-Laurentia rift zone in the early Mesoproterozoic. Rift-related igneous and sedimentary assemblages dated at ca. 1.5, 1.38, and 1.2 to 1.0 Ga correlate across the reconstructed Siberia-Laurentia rift zone. Renewed rifting in the Neoproterozoic and Vendian culminated with seafloor spreading and thermal subsidence of the conjugate rift shoulders. Correlative archeocyathan reefs, endemic olenellid trilobite fauna, and exchange of detritus between the cratons imply that the rift may have remained relatively narrow until the Atdabanian stage. Black sulfidic shales buried the archeocyathan reefs on the rapidly subsiding rift margins during the Botomian Sinsk event. 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 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.000 | 0.003 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.029 | 0.003 |
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".