Petrography and geochemistry of drill core from the Taylors Brook property in the Stirling belt, southeastern Cape Breton Island, Nova Scotia
Bibliographic record
Abstract
The Stirling belt in southeastern Cape Breton Island, Nova Scotia, is one of several belts of Precambrian rocks in the Avalonian Mira terrane of the northern Appalachian orogen. It consists of ca. 680 Ma volcaniclastic rocks, flows, porphyries, breccias, and clastic sedimentary rocks (Stirling Group), intruded by ca. 620 Ma dioritic to granitic plutons and overlain by Cambrian sedimentary rocks. It is in faulted contact at the L'Archeveque Fault with younger rocks of the Fourchu Group of the Coastal belt and the Devonian Lower St. Esprit Pluton. Based on the previously mined deposit at Stirling as well as numerous other sulphide occurrences, the Stirling belt has high potential for economic sulphide mineralization but outcrop is limited and hence the geology and tectonic setting are not well understood. This study of the petrography and geochemistry of drill core from the Taylors Brook area contributes to a better understanding of the rock units, geochemistry, mineralization, and tectonic setting of the Stirling belt. The rocks of the Taylors Brook area include basalt, quartz-feldspar porphyry, rhyolite, varied mafic and felsic tuff, cherty ash tuff, pyritic siltstone, mafic and porphyritic mafic dykes, younger quartz arenite, and the Lower St. Esprit Granite. The L'Archeveque Fault occurs at the contact between the rocks of the Stirling Group and the Lower St. Esprit Granite and separates the Stirling and Coastal belts. The volcanic rocks in the Taylors Brook area are calc-alkalic and formed in a volcanic-arc tectonic setting and the sedimentary rocks were deposited in an intra-arc basin. The mineralization that occurs in the Taylors Brook area is predominantly pyrite with minor chalcopyrite and sphalerite and forms semi-massive sulphide lenses at the contacts of quartz-feldspar porphyry units, as well as disseminated sulphides in siltstone.
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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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".