Provenance of Upper Jurassic syn-rift strata in the Terra Nova oil field, Jeanne d’Arc basin, offshore Newfoundland: a new detrital zircon U-Pb-Hf reference frame for producing reservoir sandstone units along the Atlantic Canadian margin
Bibliographic record
Abstract
Jeanne d’Arc Formation reservoir sandstone intervals from the Terra Nova oil field, Jeanne d’Arc basin, offshore Newfoundland, yield repeatable Neoarchean-Mesozoic detrital zircon age populations and imply provenance from the Newfoundland Appalachians and Canadian Shield. Tithonian-Berriasian maximum depositional ages are proposed based on ~145 Ma detrital zircon populations in nine sandstone samples from three Terra Nova wells. Mesozoic detrital zircon grains yield chondritic to superchondritic Hf isotope compositions and suggest that the Jeanne d’Arc Formation was deposited during mantle-derived, but crustally contaminated, syn-rift volcanism. The U-Pb-Hf results define a new reference frame for Jeanne d’Arc basin strata in the Grand Banks and provide opportunities to investigate correlations with deep-water reservoir units along the Atlantic Canadian margin. Zircon U-Pb data from the frontier Mizzen field compare favorably with the Jeanne d’Arc Formation results and suggest Tithonian-Berriasian continuity between Jeanne d’Arc and Flemish Pass basin reservoir units.
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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 | 0.001 |
| 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) | 0.002 | 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".