Petrogenesis and associated mineralization of Acadian related granitoids in New Brunswick
Bibliographic record
Abstract
The Acadian-related granitoids of New Brunswick are herein divided into geochemically defined groups to ascertain whether magmatic process related trends differentiate barren from mineralized granitoids. The Juniper Barren and Lost Lake granites have some similar characteristics (i.e. lowest SiO2, highest transition element contents, high-K calc-alkaline, metaluminous), but do not constitute a defined geochemical group. They have the characteristics of unfractionated (oxidized) I-type granites, and neither are associated with significant mineralization. Group NB-1 granites are metaluminous to peraluminous, high-K calc-alkaline, light rare-earth element (LREE) enriched with small negative Eu anomalies, and high Nb/Ta and Zr/Hf ratios. Group NB-1 intrusions are interpreted to be unfractionated reduced I-type granite formed via partial melting in an arc system and subsequently contaminated by reducing crustal rocks. The reduced component is critical for the formation of tungsten mineralization. Group NB-2 granites are high-K calc-alkaline, metaluminous to peraluminous I-type granite characterized by K2O contents greater than Na2O, and are LREE enriched with pronounced negative Eu anomalies. Group NB-2 granites are unfractionated to weakly fractionated I-type granite generated from different degrees of partial melting of mixed mantle - older crustal protolith with an igneous quartzo-feldspathic composition. Group NB-3 granites include the most evolved intrusions examined during this study. They are characterized by the highest SiO2 content, Gottini index and K/Rb ratio, and have the lowest Zr/Hf, Nb/Ta, La/Sm and Eu/Eu* ratios. They are considered highly evolved I-type granite formed via crustal thinning related to crustal delamination following the juxtaposition of crustal terranes during the Acadian Orogeny.
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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 | 0.003 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".