Quartz provenance in the Mesozoic of the eastern Scotian Basin
Bibliographic record
Abstract
The provenance of quartz, the predominant framework mineral in sandstone reservoirs, is an important exploration tool in petroleum basins. An integrated approach of scanning electron microscope-cathodoluminescense (SEM-CL), hot-cathode cathodoluminescense (HCL), and petrographic microscopy using grain-by-grain comparison was used to interpret provenance of sandstones in the Bandol-1 well in the eastern Scotian Basin. Information provided by SEM-CL features, HCL colours and colour shift, and optical properties such as extinction, fluid inclusion trails and polycrystallinity were combined to distinguish different quartz types. The integration of the three techniques reduces uncertainties inherent to each individual technique. The three techniques were compared and all the characteristic features for each quartz type under the three different microscopes were summarized in detail. This study suggests that the integration of SEM-CL and petrographic microscopy appears to be enough to differentiate between major quartz types such as plutonic and metamorphic quartz, while HCL analyses are important to constrain and confirm the classification of quartz types. In addition, HCL analyses were demonstrated to be very useful in assigning detrital quartz to a specific metamorphic grade. Previous detrital mineral and geochronological studies of the same samples were also used for comparison and better understanding of potential provenance sources. Possible sources of sediments to Bandol-1 well were suggested in the Gander terrane of southern Newfoundland, Humber terrane of western Newfoundland, and part of southern Dunnage terrane.
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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 | 0.000 | 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".