Insights into the tectonothermal history of Melville Peninsula, Nunavut, provided by in situ SHRIMP geochronology and thermobarometry
Bibliographic record
Abstract
Thermobarometric and in situ SHRIMP monazite geochronology indicate that two distinct metamorphic and deformational events affected Melville Peninsula. Monazite inclusions in garnet from two samples yielded ages of 2546 ± 7 Ma and 2539 ± 8 Ma. Textural features suggest they date an early deformation event in the development the Arrowsmith Orogen. Four samples from southern Melville Peninsula record monazite growth between ca. 1860 Ma and ca. 1820 Ma. Textures suggest that 1863 ± 6 Ma metamorphism initiated prior to pervasive regional deformation. Monazite growth is interpreted to date syntectonic garnet growth at ca. 1840 Ma and syntectonic, peak metamorphism at 1829 ± 4 Ma to 1825 ± 4 Ma. Petrological calculations define a clockwise P-T-t path consistent with crustal thickening that is attributed to ca. 1870 Ma collision of the Rae Craton with Meta Incognita microcontinent. Samples on northern Melville Peninsula record younger (ca. 1815-1767 Ma) monazite ages, potentially related to east-west compression that affected much of the central Rae Craton at this time.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.013 | 0.002 |
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".