Grenville Front zone, Gagnon terrane, southwestern Labrador: Configuration of a midcrustal foreland fold‐thrust belt
Bibliographic record
Abstract
Evolution of a metamorphic fold‐thrust belt in Archean and Proterozoic rocks in the Gagnon terrane, northwestern Grenville province, involved underthrusting beneath a crustal‐scale, orogenic wedge and metamorphism ranging from upper greenschist facies (∼600 ± 100 MPa/450 ± 50°C) to upper amphibolite facies (∼1100 ± 100 MPa/750 ± 50°C) during the terminal stages of the Grenvillian Orogeny. Structural and metamorphic data indicate that D1 structures formed at peak pressures during basal accretion to the overriding orogenic wedge, whereas D2 structures developed within the wedge during its displacement toward the foreland in a sinistral transpressive setting. The fold‐thrust belt developed sequentially on two levels: a thin‐skinned, cover‐dominated thrust system preceded and overlies a thick‐skinned, basement‐dominated system. The D3 cross‐folds postdated normal faulting at the top of the wedge and formed during gravitational collapse. On the basis of this study, characteristic features of midcrustal, metamorphic, thrust wedges include growth by basal accretion, polyphase ductile deformation and noncoaxial strain, dual‐level development, extensive basement involvement, and terminal gravitational collapse associated with cross‐folding.
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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) | 0.002 | 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".