Reconnaissance gamma-ray spectrometry studies of the Paleoproterozoic Piling Group and adjacent Archean basement rocks, central Baffin Island, Nunavut
Bibliographic record
Abstract
In the southern Melville Peninsula, strong radioactive element patterns, measured by reconnaissance airborne gamma-ray spectrometry, clearly discriminate Archean orthogneiss and various Archean and Proterozoic plutonic rocks. Similar geological units occur in the central Baffin Island region. In 2000, a brief field study was conducted in central Baffin Island to determine if radioactive element (K, eU, and eTh) variations measured by ground gamma-ray spectrometry can be used to assist ongoing geological mapping activities. Although radioactive element concentrations are generally low in the supracrustal rocks of the Piling Group, variation in K and eTh concentrations are associated with lithological variations. Basement rocks, composed of Archean orthogneiss and various Archean and Proterozoic granitic intrusions, produce strong radioactive element contrasts. Young pegmatite plutons can be distinguished from older intrusions by low eTh concentrations and high eU/eTh ratios. Various Archean and Proterozoic intrusions also have characteristic radioactive element signatures which distinguish them from Archean orthogneiss.
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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) | 0.001 | 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".