U-Pb ages of Archean basement and Paleoproterozoic plutonic rocks, southern Cumberland Peninsula, eastern Baffin Island, Nunavut
Bibliographic record
Abstract
Recent mapping coupled with geochronological and isotopic studies on the southern half of Cumberland Peninsula, Baffin Island, have identified and characterized four distinct plutonic suites. An extensive plutonic gneiss complex yields ages of 2991 ± 4 Ma, 2938 ± 4 Ma, and 2782 ± 4 Ma, whereas a second group of discrete plutons yields solely Neoarchean ages of 2772 ± 6 Ma, 2759 ± 3 Ma, and 2700 ± 4 Ma. These Archean rocks form the structural basement to a cover sequence, the Hoare Bay Group, both of which are cut by a charnockite-granodiorite-diorite suite with ages of 1894 ± 5 Ma and 1889 ± 3 Ma, informally designated the Qikiqtarjuaq plutonic suite. Mylonitic, high-K intrusive sheets, interpreted to have been emplaced syntectonically during regional deformation, yield ages of 1882 ± 13 Ma and 1873 ± 16 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 | 0.000 |
| 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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 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".