The timing of Proterozoic magmatism in the Pinware terrane of southeast Labrador, easternmost Quebec and northwest Newfoundland
Bibliographic record
Abstract
The Pinware terrane is located in the easternmost Grenville Province and contains crust of Labradorian (17101600 Ma), Pinwarian (15201460 Ma), Elsonian (14601230 Ma), Grenvillian (1080985 Ma), and late- to post-Grenvillian (985955 Ma) age. Newly obtained UPb geochronological data enhance understanding of all these evolutionary stages. A Labradorian age of 1632 ± 8 Ma has been obtained for the Brador River granite, thereby establishing the presence of mid- to late- Labradorian rocks in the southernmost part of the region. A maximum age of ~1600 Ma obtained for the Ten Mile Lake granite indicates for the first time that Labradorian crust could continue into the northern Long Range Inlier of western Newfoundland. Pinwarian activity is indicated by ages of ~15261504, 1500 ± 14, 1467 ± 44, and 1466 ± 8 Ma from granitoid rocks at Rivière St-Paul, West St. Modeste, Diable Bay, and Pinware, respectively. The first evidence for late Elsonian mafic magmatism in this region is provided by a concordant baddeleyite date of 1248 ± 5 Ma from gabbronorite at Lourdes-de-Blanc-Sablon. This study has also identified an early post-tectonic, high-level, maficanorthositicsyenitic magmatic event between 985 and 975 Ma. Recognition of the event relies on previous results and newly obtained ages of 979.5 ± 2.8 Ma from the Red Bay gabbro, 974.5 ± 1.8 Ma from the Vieux Fort anorthosite, and 969 ± 11 Ma from the Lower Pinware River alkali-feldspar syenite. Time, composition, and fabric criteria distinguish these rocks from late-post-tectonic monzonite, syenite and granite emplaced between 966 and 956 Ma.
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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 | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| 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".