Supplementary Data Files to accompany: Germain R., Kuiper, Y.D., White, S.E., and Crowley, J.L. 2025. Zircon U–Pb evidence for the extent of the Meguma terrane and late Ediacaran magmatism in offshore Nova Scotia, Canada. Atlantic Geoscience, 61, pp. 577-615.
Bibliographic record
Abstract
The accompanying files contain the supplementary data that accompany the publication for which the full citation and abstract are given here. Abstract: A U–Pb LA-ICP-MS zircon study was conducted on 22 rock samples from offshore southeastern Nova Scotia, Canada, to investigate the nature of the pre-Mesozoic basement and the provenance of the overlying syn-rift Late Triassic Eurydice Formation of the Scotian Basin. Detrital zircon signatures from five offshore basement metasedimentary samples were consistent with those of the Meguma terrane. Three granitoid samples yielded ca. 381–358 Ma crystallization ages, consistent with felsic plutons of the onshore Meguma terrane. These results confirm that the Meguma terrane underlies the Scotian Basin. An isotopically evolved granodiorite yielded a ca. 576 Ma crystallization age and is interpreted as basement to the Meguma terrane. Its temporal, isotopic, and geochemical similarities with igneous rocks of the Ouarzazate Group in the Anti-Atlas of Morocco suggest that the Meguma terrane likely initiated in a Cadomian back-arc basin of northwest Africa. Detrital zircon signatures from the Eurydice Formation suggest that the late Ediacaran–Ordovician Meguma Supergroup was its primary sediment source, and absence of Silurian to Devonian zircon ages suggests that the rift-related Rockville Notch Group of the northwestern part of the Meguma terrane was not a source and likely absent below the Scotian Basin. The Rockville Notch Group was previously interpreted to represent rifting between Gondwana and the Meguma terrane. We interpret the ca. 576 Ma granodiorite as representing rifting between Gondwana and the Meguma terrane, and the Rockville Notch Group as Silurian rifting of an outboard Cadomian arc from the Meguma terrane.
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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 | 0.002 | 0.034 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.005 | 0.010 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.005 | 0.005 |
| Open science | 0.004 | 0.003 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.847 | 0.369 |
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".