Bibliographic record
Abstract
Lithospheric mantle keels beneath cratons are substantially colder than the surrounding asthenosphere. If processes of delamination or thermochemical erosion create a new edge that abruptly juxtaposes internal parts of a cratonic keel with convecting upper mantle, the intact part of the keel will be heated along the edge by thermal diffusion. Sustained heating along a newly exposed edge will lead to a reduction in seismic-wave speed and density within a slowly expanding region of the lithospheric keel. Here, we combine thermal-diffusion modeling with mineral-physics relations to explore the predicted seismic expression of this process, as well as the potential for characterizing its time dependence. Examples are presented that are broadly representative of proposed models for the western edge of Laurentia beneath the Canadian Cordillera and the boundary between the Ordos Block and the eastern North China craton. Analysis of synthetic seismograms indicates that teleseismic body-wave delay times could be used to characterize an edge-proximal velocity reduction in order to provide an upper-bound estimate on time of formation of a craton edge.
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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 | 0.000 |
| Science and technology studies | 0.000 | 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) | 0.002 | 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".