Field relations, petrology, and tectonic setting of the Ordovician West Barneys River plutonic suite, southern Antigonish Highlands, Nova Scotia
Bibliographic record
Abstract
The West Barneys River plutonic suite is an assemblage of medium- to coarse-grained syenite to alkali-feldspar granite and gabbro which outcrops over an area of about 100 km2 in the central part of the southern Antigonish Highlands. Based on mapping and petrological studies, the suite has been subdivided into three intermediate to felsic plutons (Laggan, Brora Lake, and Haggarts Lake), two mafic plutons (Garden River and Duck Ponds), and a large, heterogeneous pluton named the Poor Farm Brook composite pluton. The Poor Farm Brook composite pluton is dominantly mafic (~65%) but also includes the chemical equivalents of the intermediate and felsic rocks found in the other plutons. Magma mixing and mingling textures indicate a co-magmatic relationship between the intermediate-felsic and mafic lithologies. Intermediate to felsic rocks are hypersolvus and in some cases show interstitial granophyre indicative of shallow emplacement. Many of the intermediate and felsic rocks are highly magnetic but susceptibilities vary because of variability in opaque mineral composition and degree of alteration. Geochemically, intermediate and felsic rocks are dominantly alkaline and have characteristics of within-plate, A-type granitoid suites. Gabbroic rocks are dominantly inequigranular (locally porphyritic) and highly magnetic, attributed to the high percentage of opaque minerals although some samples have lower susceptibilities. The gabbroic rocks are transitional from tholeiitic to alkalic and have compositions characteristic of continental within-plate rocks. Emplacement of these rocks is probably related to ensialic back-arc extension associated with Tornquist sea oceanic lithosphere subduction beneath Avalonia throughout the Ordovician. The West Barneys River plutonic suite represents an important and previously unrecognized magmatic episode during the evolution of Avalonia.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".