Structural analysis of an area of ductile deformation between the Murray Fault and the Grenville Front Boundary Fault near Coniston, Ontario
Bibliographic record
Abstract
Zones of mylonites are a prominent feature of rocks that occur at the Grenville Front in central Ontario. They represent periods of northwest-directed thrusting during the Mesoproterozoic, the latest period due to the Grenville Orogeny at ∼1.0 Ga. We describe the strain and folding of a 300 m wide zone of mylonites southeast of Coniston, Ontario that occur in the foreland to the Grenville Province. They are greenschist facies quartz mylonites and quartz feldspar mylonites formed in the upper crust from sandstones and granites in the Southern Province. They are bounded to the north and south by the Murray Fault and Grenville Front Boundary Fault, respectively, steeply dipping reverse faults, which are post-mylonitization in age. The latter fault marks the southern boundary of the foreland mylonites with zones of mylonite in high grade, lower crustal schists, and gneisses of the Grenville Province. The Murray Fault marks their northwestern boundary against a middle Proterozoic metamorphic terrane. Shape fabric measurements of quartz indicate that strain intensity is random across the mylonite zone. Open angle quartz c-axis fabrics, the dominance of subgrain rotation recrystallization of quartz, and the metamorphic paragenesis quartz–muscovite–chlorite indicate that the mylonites formed at low greenschist facies temperature (350–430 °C). The measured variation in strain is attributed to variations in strain rate and water weakening. The mylonites are folded; hinge lines and axial planar stretching lineations plunge southeast perpendicular to the Grenville Front. The mylonites are similar to those that occur in the foreland of the Moine Thrust (northwest Scotland) and the Munsiari Thrust (northwest India).
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 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 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".