The Grenville Province: revisiting the orogenic framework and integrating recent findings
Bibliographic record
Abstract
The Grenville Province holds record of Mesoproterozoic orogenic processes at the Laurentian margin during the assembly of Rodinia. This contribution reviews key characteristics of the Province, integrates recently published data, and questions some earlier interpretations. Despite crustal reworking during the Grenvillian orogeny (1.09–0.98 Ga), contrasts between crustal-age domains across the Allochthon Boundary largely reflect differences between internal and external Laurentia, and allochthonous units were far-travelled in the west but not in the east. In addition, there is growing evidence towards a continuum between the Ottawan and Rigolet orogenic phases. Based on ages of metamorphism, the high-pressure segments of the hinterland reflect localized thickening at the front of the Ottawan orogen and evidence for an orogenic plateau is limited to the western Grenville. Peak metamorphic conditions in the mid-pressure orogenic core, mostly within the confines of biotite dehydration melting (max ∼900 °C) for aluminous rocks, culminated in early Ottawan and were followed by protracted extension. In addition, high-temperature granitoid magmatism was active throughout the duration of the orogeny and localized in formerly pericratonic terranes accreted at 1.4 and 1.2–1.1 Ga, indicating an influence of inherited lithospheric structures on Grenvillian mantle dynamics. The overall orogenic pattern reveals considerable lateral variations in the hinterland potentially linked to the earlier configuration of external Laurentia and is consistent with weak lithosphere supporting a broad, hot, but not necessarily high-standing orogen for most of the Ottawan, in contrast to the Rigolet phase that marks the propagation of the orogen against Archean lithosphere of internal Laurentia.
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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 | 0.002 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.005 | 0.005 |
| Science and technology studies | 0.001 | 0.006 |
| Scholarly communication | 0.004 | 0.003 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| 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".