Cenozoic relative movements of Greenland and North America by closure of the North Atlantic-Arctic plate circuit: The Labrador Sea, Davis Strait, Baffin Bay, and Eurekan Orogen
Bibliographic record
Abstract
Cretaceous to earliest Oligocene plate motions between Greenland and North America are only modellable at high resolution from a short-lived (61-42 Ma) sequence of magnetic isochrons in the Labrador Sea. Understanding them at other times is hampered by interpretational conflicts and low resolution in geoscientific observations of the Labrador Sea, Davis Strait, Baffin Bay, and Eurekan Orogen. To better contextualize these observations, we build and manipulate models of North America-Eurasia and Eurasia-Greenland divergence in order to depict post-84 Ma North American-Greenland motions at quantified high resolution. Among our findings, we show that the North American-Eurasian plate boundary propagated northwards, leading the continental shelves in the Labrador Sea to separate by 74-72 Ma and in Baffin Bay later, at around 63 Ma, and that field evidence for the Eurekan Orogeny having occurred in two distinct phases is directly related to a 46 Ma change in Greenland-North American plate motion parameters.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 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) | 0.004 | 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".