New insights on the structural geology of the Pacquet Harbour Group and Point Rousse Complex, Baie Verte Peninsula, Newfoundland.
Bibliographic record
Abstract
The Baie Verte Peninsula represents one of the classical areas to study the structural evolution of peri-Laurentian ophiolite and arc complexes, before and following, their tectonic juxtaposition to the early Paleozoic Laurentian margin. We present regional structural data that focuses on the ophiolitic and cover rocks of the Pacquet Harbour Group (PHG) and Point Rousse complex (PRC), and that have been affected by at least four phases of regional deformation. The D1 fabrics are poorly preserved and strongly overprinted in the ophiolitic rocks, but are locally preserved in the Fleur de Lys Supergroup (Humber Zone). The D1 phase is interpreted to be related to the obduction of ophiolites during the Ordovician Taconian Orogeny; D2 represents the main tectonometamorphic phase. In the PRC, D2 fabrics are mostly parallel to, and associated with, the west-trending south-directed reverse faults. Southward, these culminate with the Scrape fault, a ductile shear zone that juxtaposes serpentinized mantle of the PRC over amphibolitic gabbros and basalts of the PHG. The Scrape fault and D2 southdirected shear zones separating the PRC from the PHG are affected by penecontemporaneous transverse high-strain zones (D2b) interpreted as lateral ramps. The intensity of D2 fabrics and metamorphism decreases southward from strong L>S fabric in the amphibolites north of the Rambler Mines area to a series of open folds in the low-grade mafic volcanic rocks of the southern PHG; D2 is interpreted to be related to transpression and crustal thickening during the Silurian Salinic Orogeny. In the northern PHG, D2 fabrics are progressively affected by recumbent F3 folds, which appear to be cogenetic with extensional shear zones and inversion of reverse faults in an overall dextral, locally transtensional regime during the Early to Middle Devonian. Late northeast- to northwest-trending open F4 cross-folds deform all of pre-existing fabrics but are generally not associated with any cleavage development. The disposition of the base-metal deposits such as the Ming and Rambler deposits is strongly controlled by these deformational events; D2 was the most significant, giving ore bodies an overall northeast plunge, sub-parallel to L2 stretching lineations, and D2 shear zones and folds may also have displaced or structurally thickened ore bodies. Post-D2 deformation is locally significant and affects the orientation and geometry of prospective horizons and ore deposits. Ongoing structural analysis and geochronology will be critical in further refining the structural evolution of the Baie Verte Peninsula and will help establishing guidelines for mineral exploration.
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".