Structural controls on multistage gold mineralisation within the Baie Verte Peninsula of Newfoundland, Canada
Bibliographic record
Abstract
The Baie Verte Peninsula (BVP) is one of the richest auriferous regions within the Newfoundland Appalachians hosting more than 100 economic and sub-economic gold occurrences. The geological setting of the BVP resulted from the accretion of several micro-terranes of Iapetus origin to the Laurentian margin during the Ordovician Taconic Orogeny. The Baie Verte Line (BVL), a major crustal fault, represents the suture between the Laurentian margin and the accreted island arcs. Subsequent progressive deformation (D2) developed under a sinistral transpressional setting during the Salinic and Acadian orogenic events. Later deformational phases (D3-D4) resulted in response to complex dextral transcurrent motions localised along the BVL during the Neo-Acadian Orogeny. \nThe studied gold occurrences, Stog’er Tight, Argyle, Romeo & Juliet, Deer Cove, and Pine Cove lie along splays of the BVL. New structural, mineralogical, and geochronological data has been collected through geological mapping, optical and SEM/CL investigations of mineralized samples, and in-situ LA-ICP-MS U-Th-Pb geochronology of monazite, xenotime, and titanite. Structural data analysis showed that at least three deformational events (D2-D4) influenced the formation and the present geometry of the gold deposits. Mineralogical and geochronological data revealed complex paragenetic sequences in each deposit and at least two periods of gold precipitation. \nThe age of the first gold mineralising moment is constrained between ~420 to 410 Ma. The mineralised veins formed during the D2 progressive deformation, under brittle-ductile conditions, broadly synchronous with the development of E-W striking and south directed thrusts, splays of BVL. \nThe maximum age of the second gold mineralising event is ~396 Ma, whereas the best estimate age is ~380 Ma. The gold bearing veins formed during the D3-D4 deformational events. At this time the entire BVP was under extension-related exhumation processes. Currently, it is unclear whether the later mineralising fluids either augmented the existing gold endowment or remobilized the pre-existing gold.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.002 | 0.000 |
| Open science | 0.001 | 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".