Petrology and stratigraphy of the White Rock Formation, Yarmouth area, Nova Scotia
Bibliographic record
Abstract
The White Rock Formation in the Yarmouth area occurs in a faulted synclinal structure underlain by the Halifax Formation. The formation is divided into 7 stratigraphic units based on field mapping, petrographic study and published geophysical maps. All units are commonly intruded by mafic dykes and/or sills that also occur in the adjacent Halifax Formation. Metamorphic grade is greenschist to amphibolite facies. The Brenton Pluton occurs on the eastern limb of the syncline and appears to be in faulted contact with the basal unit of the White Rock Formation on the west and slate of the Halifax Formation on the east. The chemistry of mafic volcanic rocks indicates an alkalic affinity and a within plate tectonic setting. The felsic volcanic rocks are chemically similar to the Brenton Pluton and both have characteristics of within-plate A-type granites. The mafic volcanic rocks are comagmatic with the mafic dykes and sills and with the felsic rocks, but Sm-Nd data ([epsilon]Nd +1.37) indicate a crustal influence in the felsic rocks. Volcanic rocks in the Yarmouth area are chemically similar to those elsewhere in the White Rock Formation. A felsic tuff from near the top of the formation yields a U-Pb age of 438 +3/-2 Ma, which supports an Early Silurian age for the formation and provides a constraint for stratigraphic correlation with other areas in western Nova Scotia. A regional geochemical comparison with the Arisaig Group indicates similar tectonic settings but chemically different sources. The geochemistry of the White Rock Formation and Brenton Pluton indicate a continental extensional environment in the Meguma terrane during the Silurian.
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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 | 0.001 |
| 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".