The lithosphere of Ellesmere Island and adjacent northwestern Greenland (CALE 'A' transect onshore)
Bibliographic record
Abstract
Ellesmere Island, in Canada’s Arctic, comprises a series of ~SW-NE trending tectonic provinces, the crustal structure and geological expression of which represent a combination of interplate, accretionary orogenesis in the Palaeozoic (Caledonian equivalent and Ellesmerian orogenies) and intraplate orogenesis in the Cenozoic (Eurekan Orogeny). The present-day topography of Ellesmere Island is closely related to the crustal architecture of these tectonic provinces, which includes the adjacent polar continental margin. A two-dimensional lithosphere-scale model is presented that crosses Ellesmere Island from northern Baffin Bay to the Arctic Ocean, part of Transect “A” of the Circum-Arctic Lithosphere Evolution (CALE) project. The model is based on gravity and magnetic data constrained by mapped geological structure as well as a not yet unpublished Receiver Function study, based on teleseismic data acquired between 2010 and 2012 by a passive seismological array on Ellesmere Island called “ELLITE”. In northern Baffin Bay and on parts of the polar margin of Ellesmere Island (and adjacent northwestern Greenland), published crustal scale seismic refraction velocity models also provide some constraint to the lithosphere model. The most recent tectonic event governing the geological and physiographic character of Ellesmere Island is the Eurekan Orogeny, an intraplate orogeny that developed as a consequence of North Atlantic-Arctic plate reorganisations and the resulting convergence of Greenland against Ellesmere Island in the Palaeogene. The basement of the Eurekan orogen comprises Precambrian-aged lithosphere in its northernmost (Pearya terrane) and southeasternmost (Greenland-Canada craton) parts as well as possibly younger lithosphere accreted during Palaeozoic orogenesis in central Ellesmere Island. Its southern margin, marking the southern terminus of the constructed lithosphere model, comprises the late Precambrian-Early Palaeozoic passive continental margin of Laurentia. The preliminary Receiver Functions show signatures of strong intracrustal velocity discontinuities, possibly indicating major vertical structural differences in in the central part of Ellesmere Island, which are absent in the north and south. The lithosphere model is interpreted in the context of plate convergence processes in the Palaeozoic and large-scale intraplate shortening in the Cenozoic with extensional tectonics dominating throughout the Mesozoic.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
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".