Deformation of the Clast-matrix System and its Application to the Microstructural Analysis o f Mylonites
Bibliographic record
Abstract
The theory for the deformation of the clast-matrix system where the clasts are rigid is based on Jeffery (1922, Proceedings of the Royal Society of London A102, 161-179) and is well understood. The theory for the deformation of the clast-matrix system where the clasts are deformable (Eshelby, 1957, Proceedings of the Royal Society of London A241, 376-396) has not been well studied, although it is more applicable to rock deformation. Recent studies indicate that a large discrepancy exists between microstructural data and the predictions based on Jeffery’s theory. Several mechanisms have been proposed to explain this discrepancy, but the problem remains unresolved. The purpose of this study is to numerically investigate the motion of a deformable clast immersed in a slow Newtonian viscous flow subjected to a general two dimensional deformation, and to apply the results to the microstructural analysis of mylonites, particularly, those from the southern Omineca Belt of the Canadian Cordillera. The motion of a deformable clast is determined by the bulk flow type, the viscosity ratio of the clast to the matrix, the aspect ratio and the initial orientation of the clast. Numerical investigations show that, for a kinematic vorticity number between 0 and 1, there are four regimes of clast behaviors and each regime has up to four types of clast deformation paths. It is found that a general model based on the modified Eshelby’s theory can be successfully applied to the interpretation of natural rock fabrics. Most mechanisms previously proposed to interpret the discrepancy between microstructural data and the predictions based on Jeffery’s theory can be explained by this general model proposed in this study. By comparing natural data with numerical results, the deformation kinematics and rheology of the high\nstrain zones in the southern Omineca Belt have been constrained.
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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) | 0.000 | 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 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 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 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".