Atlantic Geoscience Society Abstracts 37th Annual Colloquium & Annual General Meeting 2011
Bibliographic record
Abstract
The Antigonish Highlands in northern mainland Nova Scotia are part of Avalonia.Plutonic rocks occur throughout the highlands and recent studies have shown that they are of predominantly two ages: ca.610 Ma (Late Neoproterozoic) and ca.470-460 Ma (mid-Ordovician).The older suites are mafic through felsic rocks with typical calc-alkalic "I-type" characteristics.In contrast, the Ordovician plutons, which occur mainly in the southern highlands, are of gabbroic to syenitic and granitic compositions.Mapping in the summer of 2010 showed that the Ordovician intrusions are widespread, covering an area of approximately 100 km2 and they have been named the West Barneys River Plutonic Suite.Gabbroic rocks comprise approximately 40% of the area whereas granitic and syenitic rocks represent about 55%.The remaining 5% of the area consists of metasedimentary and volcanic rocks which occur as xenoliths and roof pendants in the plutonic suite.The plutonic suite intruded Neoproterozoic sedimentary and volcanic rocks of the Georgeville Group, which is the probable source of the xenolithic and roof pendant material.The West Barneys River Plutonic Suite displays magma mixing and mingling textures indicative of a co-genetic relationship between the felsic and mafic lithologies.Younger mafic dykes cross-cut all lithologies.This study focuses on the petrography and geochemistry of the gabbroic rocks in the suite.Earlier studies had shown that the granitic and syenitic rocks contain aegirine, riebeckite, and in some samples fayalite, indicative of peralkaline compositions.Petrological indicators suggest that they formed in a withinplate extensional setting.Preliminary petrographic study of the gabbroic rocks shows that they consist mainly of plagioclase, clinopyroxene, amphibole, and rarely olivine or quartz, together with apatite, biotite, and a number of opaque phases including ilmenite, magnetite, and pyrite.Many samples are extensively chloritized, sericitized, and/or saussuritized.Textures are ophitic to sub-ophitic with some samples showing porphyritic textures.Preliminary chemical data indicate that the gabbroic rocks have compositions characteristic of continental within-plate tholeiite.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.003 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.480 | 0.325 |
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".