Grenville Front zone, Gagnon terrane, southwestern Labrador: Configuration of a midcrustal foreland fold‐thrust belt
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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 D 1 structures formed at peak pressures during basal accretion to the overriding orogenic wedge, whereas D 2 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 D 3 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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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) | 0.000 | 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) | 0.019 | 0.000 |
Machine scores (provisional)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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