Mantle flow mechanisms of epeirogeny and their possible role in the evolution of the Western Canada Sedimentary Basin
Bibliographic record
Abstract
Otherwise stable cratons periodically experience enigmatic episodes of large-scale uplift and subsidence that may result in widespread marine transgressions and the subsequent formation of sedimentary basins. Strata in the Western Canada Sedimentary Basin, for example, record flooding events that reached deep into the interior of the continent during the Devonian to Carboniferous. The epeirogenic motion which caused this deposition was contemporaneous with compressive tectonic events along the western plate margin of Laurussia. We propose that the long-wavelength component of inferred subsidence and uplift across the basin was the result of mantle flow-induced dynamic topography. In particular, we investigate the epeirogenic signals associated with the coupled mantle processes of near-surface subduction and later stage penetration of accumulated slab material through the endothermic phase change at 660 km depth. Numerical simulations of convection are presented to model the thermo-mechanical evolution of subduction in the mantle. The associated dynamic topography is initially characterized by tilting of the continental margin and submergence approximately 1000 km from the trench due to viscous effects associated with the subduction. A more extensive transgression onto the continental platform follows as accumulating slab material penetrates through the endothermic phase change. We argue that the predicted subsidence and uplift is broadly consistent with the inferred record of DevonianCarboniferous epeirogeny across western Canada, and thus that the evolution of the Western Canada Sedimentary Basin may be intimately connected to mantle flow processes occurring contemporaneously beneath the craton.
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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 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".