Abstract: Anomalous Zn concentrations in the West Barneys River intrusion, Antigonish Highlands, Nova Scotia
Bibliographic record
Abstract
This study investigates the association between an Ordovician granitoid intrusion and anomalous Zn concentrations in stream sediments in the West Barneys River drainage basin, Antigonish Highlands, Nova Scotia. Samples from this intrusion exhibit Zn concentrations up to 352 ppm, far exceeding the average granitoid Zn concentration of 60 ppm. Two lines of investigation were undertaken to determine the source of the anomalous Zn. First, a ground magnetometer survey was done to constrain the distribution of the four variably magnetic units comprising the intrusion (fine-grained alkali feldspar granite, granophyric alkali feldspar granite, coarsegrained alkali feldspar quartz syenite, and gabbro/quartz gabbro). The magnetometer survey identified locations of highly magnetic units (gabbro/quartz gabbro), and the boundaries of the intrusion. Second, because of sparse outcrop, a soil (instead of rock) geochemical survey was carried out to determine the locations of anomalous Zn concentrations. The geochemical survey involved 320 samples sieved to -177 μm and analyzed by aqua regia/ICP-MS. Soil Zn concentrations exhibit a mean of 189 ppm, but range up to 1094 ppm, and thus far exceed the global average concentration of Zn in soils (50 ppm). A comparison of the results of these two surveys provides insight into the spatial relationship of Zn concentrations and intrusive rocks. Anomalous soil Zn concentrations most commonly occur in or adjacent to West Barneys River in the western part of study area, an area underlain by quartz syenite and granophyric alkali feldspar granite. Results from this study identify the portions of the West Barneys River intrusion that may contain anomalous concentrations of Zn, and thus constrain where additional research into the cause of the anomalous Zn concentrations should be undertaken.
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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 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".