Autochthonous crustal growth and sedimentation in the Superior Province recorded by xenocrystic and detrital zircon
Bibliographic record
Abstract
Analysis of U-Pb/Lu-Hf isotopes in zircon populations from plutonic orthogneisses and metasedimentary rocks are used to constrain the Paleoarchean to Neoarchean tectonic processes that led to Neoarchean cratonization of the western Superior Province. Plutonic orthogneisses from the North Caribou and western Wabigoon terranes assimilated varying degrees of Paleoarchean to Mesoarchean protoliths in the form of xenocrystic zircon, which indicate that the dominantly juvenile Neoarchean western Wabigoon and juvenile Mesoarchean to Neoarchean North Caribou terranes formed in association with an older Paleoarchean to Mesoarchean crustal basement. In addition, metasedimentary rocks from the North Caribou, English River, Winnipeg River, Wabigoon and Quetico terranes have detrital zircon age spectra and Hf(t) isotope compositions indicating ubiquitous availability of similar sedimentary sources across the western Superior Province during the Neoarchean. Collectively, the xenocrystic and detrital zircon evidence from the western Superior Province supports autochthonous growth of all terranes while the Neoarchean pre/ syn -tectonic basins accepted detritus from widely available Mesoarchean to Neoarchean sources.
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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 | 0.000 | 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".