Subcontinental sinking slab remnants in a spherical geometry mantle model
Bibliographic record
Abstract
Comparisons of the paleogeographic record with seismic tomography sections from the mantle below Asia indicate that detached slab remnants associated with a range of ages since subduction spanning roughly 100 Myr appear to occupy mid‐mantle depths at different sites. More than one explanation for the observed spectrum of ages at similar depths may be plausible. To identify key parameters controlling the sinking rate of a slab, we examine the effects of mantle viscosity, Rayleigh number, and spherical geometry, as well as the role of slab properties, such as strike width, depth extent at the time of slab detachment, and slab rheology. We model scenarios featuring detached mantle slabs in 3‐D calculations and conclude that the initial depth extent of a subducted slab segment is a key parameter determining the rate at which the slab sinks. We estimate that stiff slabs are able to occupy mid‐mantle depths for ages ranging from approximately 35 to 150 Myr, depending on the initial depth extent of the slab at the time of its detachment from the lithosphere. This age range results from the time that different slab fragments require to cross the viscosity interface at the upper mantle/lower mantle boundary. In cases featuring mature slabs where the lower section of the slab has penetrated the lower mantle prior to detachment, entrainment by the deep sinking segment helps the young upper mantle section of the slab cross into the lower mantle much more quickly than a slab segment initially confined to the upper 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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.002 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.004 | 0.002 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 0.001 |
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".