New U-Pb geochronological results from plutonic and sedimentary rocks of Southampton Island, Nunavut
Bibliographic record
Abstract
A hornblende-biotite monzogranite with a crystallization age of 2692 ± 6 Ma and semi-pelite-psammite cut by a peraluminous granite dated at 2682 ± 17 Ma establish the presence of plutonic and supracrustal rocks of Archean age on Southampton Island. A potentially Paleoproterozoic carbonate-quartzite cover sequence has a maximum depositional age of 2615 ± 23 Ma, similar to an epiclastic rock (2599 ± 15 Ma) that differs in provenance profile. A quartz porphyry is dated at 1934 ± 8 Ma, similar in age to charnockite dated at 1931 ± 19 Ma. A sample of gabbroic anorthosite is interpreted to have crystallized at 1870 ± 10 Ma. Regionally extensive, foliated biotite granodiorite is dated at 1852 ± 8 Ma. Archean detritus and inheritance, as old as 3.7 Ga, is common in the aforementioned metasedimentary and plutonic rocks, with the exception of the quartz porphyry. Massive to very weakly foliated monzogranite, dated at 1821.7 ± 2.5 Ma, provides a minimum age on penetrative deformation across Southampton Island.
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
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".