Kinematic History and Tectonic Evolution of the Amerasian Basin: Investigating Palaeo-Plate Boundaries around the Chukchi Borderlands - Abstract
Bibliographic record
Abstract
The Arctic Ocean has been influenced by both the Atlantic and Pacific Ocean plate systems during its tectonic history. The complex multi-stage opening of the basin is only partially understood, in part, due to the difficulty of utilizing traditional geologic and geophysical oceanographic techniques in ice-covered waters. While the kinematic development of the Eurasian Basin is well-understood to be the northernmost extension of the Mid-Atlantic Ridge, the history of the morphologically complex Amerasian Basin may be due to multiple events, significantly complicating interpretation of its history. Any detailed model for the opening of the Amerasian Basin should look for structures that would accommodate spreading, as well as seek to explain the tectonic mechanisms that drove the basin's development. Tholeiitic flood basalts of similar ages have been observed along the margins of the Arctic Ocean and are thought to represent a Large Igneous Province. Since LIPs are usually associated with continental rifting, a successful model for the basin might be based on reconstructing the geometry of the Cretaceous High Arctic Large Igneous Province and its associated radiating dike swarms. Detailed models should also consider pre-existing zones of weakness such as the suture zone and deformation front of the ancient Caledonides. These may underlie the shelf sediments and extend northward from the Eurasian Arctic Margin across the Barents Shelf coinciding with the bend in the Lomonosov Ridge. This would facilitate the development of transform faults on either side of the Mendeleev Ridge to accommodate spreading in the newly forming Amerasian Basin, as well as creating a rectangular pull-apart basin between the Mendeleev and Lomonosov Ridges. We propose a revised plate model for the development of the Amerasian Basin. This model invokes a triple junction in the central Canada Basin. A magmatic source, localized under the Alpha Ridge generated the radiating dike swarms and tholeiitic flood basalts of similar Early Cretaceous age found on the DeLong Islands, Svalbard, Franz Joseph Land, Greenland, Sverdrup Basin and, possibly, the Alpha and Mendeleev Ridges that accompanied the onset of rifting in the Amerasia Basin. This resulted in a dilatational opening of the Canada Basin, the reactivation of previous structural trends, and the migration of the southern edges of the northeastern Siberian shelf along large right lateral transform faults that allowed crustal escape toward the Pacific subduction zone. Bathymetry, aeromagnetic and gravity data also support a complimentary zone of left lateral transform motion along the northern Alaska margin and southern edge of the Chukchi Borderlands which would also have accommodated spreading and southerly escape.
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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 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".