Abstract: Petrology and tectonic setting of mafic dykes in the Boisdale Hills, Cape Breton Island, Nova Scotia
Bibliographic record
Abstract
Many mafic dykes occur throughout ca. 560 Ma granitoid plutons and their host rocks of the George River Metamorphic Suite in the Boisdale Hills of south-central Cape Breton Island. Based on the study of 86 samples from dykes throughout the area, the dykes are divided into four types: (1) clinopyroxenebearing, generally the least altered and containing plagioclase, quartz with embayments, and secondary actinolite; (2) amphibole-bearing, with both hornblende and actinolite, and more altered, with only small amounts of relict pyroxene and quartz; (3) plagioclase-phyric, with sericitized plagioclase phenocrysts, quartz showing undulose extinction and amygdales filled with secondary chlorite and calcite; (4) intensely altered dykes that have undergone extensive sericitization covering about 80% of the samples and containing amygdales filled with secondary minerals. All four types contain secondary minerals including both Feand Mg-rich chlorite, epidote, calcite, sericite, and saussurite. Mineral analyses by electron microprobe in types 1–3 yielded plagioclase compositions in the range An17-45 and showed that the pyroxene is augite with about 2% TiO2. In amphibole-bearing dykes (type 2) the amphibole is magnesio-hornblende and actinolite. Whole-rock chemical analyses show some scatter, especially in mobile elements as a result
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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 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".