Regional Infiltration of Meteoric Water into the Mira Terrane: a Stable Isotope Study of the Avalonian Huntington Mountain Pluton and Related Rocks, Cape Breton Island, Canada
Bibliographic record
Abstract
The Avalonian Mira terrane of Cape Breton Island, Nova Scotia, Canada is composed mainly of late Proterozoic volcanic-plutonic-sedimentary rocks that formed in an evolved magmatic arc along the margin of Gondwana. The purpose of this study is to determine the source(s) and timing of the 18O-depletion that has affected the 620 Ma Huntington Mountain pluton and East Bay Hills volcanic suite of the Mira terrane. Plutonic and volcanic rock samples have oxygen-, hydrogen- and carbon-isotope values of-6.3 to +14.3‰, -93 to -56‰, and -7.4 to +0.1‰, respectively. These values likely signal the interaction of meteoric-dominated hydrothermal fluids with the Himtington Mountain pluton and East Bay Hills volcanic suite. The occurrence of widespread, pervasive propylitic alteration and the absence of a localized pattern of oxygen-isotope anomalies suggest that the 18O-depletion arose during initial rifting of the Mira terrane from Gondwana, ca. 575-560 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 | 0.001 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 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".