Exhuming the Top End of North America: Episodic Evolution of the Eurekan Belt and Its Potential Relationships to North Atlantic Plate Tectonics and Arctic Climate Change
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Bibliographic record
Abstract
Abstract We present the first low‐temperature thermochronology data from northernmost Ellesmere Island (Canadian Arctic), along with palynological data from Paleogene sediments. Our study area is part of the >2,500‐km‐long Eurekan deformation belt that formed across the High Arctic during the Eocene. The aim of this study is to investigate the exhumation of the Eurekan belt and potential relationships with the opening of the North Atlantic, as well as with environmental changes of the Arctic. Our data show that the Canadian Arctic margin was characterized by stretching and basin formation during the Paleocene. Sediment deposition occurred in a coastal swamp environment under a warm and humid climate that lasted into the early Eocene. Exhumation of northern Ellesmere Island was episodic and was presumably controlled by strike‐slip movements along the De Geer Fracture Zone between Svalbard and Greenland. Enhanced exhumation of northern Ellesmere Island occurred ~66–60 Ma, ~55–48 Ma, 44–38 Ma, and 34–26 Ma. These exhumation periods largely correlate with changes of spreading rates and movement directions of the Norwegian‐Greenland Sea. Main topographic growth along the Eurekan belt was temporally coincident with deposition of ice‐rafted debris off eastern Greenland. We suggest that Eurekan topography growth was an important trigger for glacier formation in Greenland. The cessation of rapid exhumation at ~26 Ma can be explained by continental separation between Greenland and Svalbard, which decoupled northern Ellesmere Island from strike‐slip movements along the De Geer Fracture Zone, eventually leading to the opening of the Fram Strait.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it