On the relative importance of mineral phase transitions and viscosity stratification in controlling the sinking rates of detached slab remnants
Bibliographic record
Abstract
We employ a two‐dimensional control‐volume model of convection in a cylindrical shell to study sinking rates of cold parcels of material in the Earth's mantle. Our model uses periodic boundary conditions, at 0 and 360 degrees, to eliminate side‐wall effects and includes mineral phase transitions at 410 km and 660 km depths and a depth‐dependent viscosity. We compare the rates of sinking of cold material with and without phase boundaries and with and without viscosity increases with depth. When the viscosity increase is sufficiently large we find the sinking rate is relatively insensitive to the presence or absence of phase boundaries; the effects of viscosity dominate. If recent estimates of large viscosity increases in the lower mantle are correct, our model could account for mid‐mantle slab remnants of Jurassic age independent of the existence of phase transition boundaries in the mantle.
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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 | 0.002 |
| 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 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| 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 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".