Coupled crust‐mantle dynamics and intraplate tectonics: Two‐dimensional numerical and three‐dimensional analogue modeling
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Bibliographic record
Abstract
Tectonic deformation of some intraplate regions may be caused by the Rayleigh‐Taylor (RT) instability of dense subcrustal lithosphere (mantle lithosphere) as it descends into the mantle. We report on a series of scaled three‐dimensional (3‐D) analogue and 2‐D numerical experiments of coupled crust‐mantle dynamics that study such a process. The models investigate the effects of two geometries of RT instability (linear versus axisymmetric) and use different rheological stratifications of the crust. The growth of the RT instability is strongly influenced by crustal rheology. While RT growth rates are not greatly influenced by the geometry of the mantle lithosphere instability itself, the surface is. Experiments having a viscous‐only crust are characterized by significant crustal contraction and thickening above the mantle downwelling and extension and thinning in adjacent regions. In experiments with a brittle upper crust the surface deformation is much more subdued. However, strong mantle flow‐induced deformation still occurs in the ductile lower crust beneath the quiescent brittle upper crust. When the lower crust is relatively strong, localized styles of extensional and contractional structure develop in the brittle upper crust owing to the greater degree of coupling between upper crust and the mantle instability. In all the experiments, a portion of the ductile lower crustal material is entrained within the downgoing RT instability deep into the mantle. The interplay between dynamic topography and crustal thickening/thinning induced by the underlying mantle flow governs various time‐dependent phases of subsidence and uplift of the model surface. The experiments help to account for a number of first‐order tectonic behaviors of the lithospheres of Earth and other terrestrial planets. For example, intraplate orogens and basins, complex localized tectonic structure in intraplate settings, and deep crustal seismic fabrics may arise as the variable crustal response to underlying mantle lithosphere RT instabilities.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 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 it