The origin and timing of late-stage carbonate cements in Devonian carbonates of the deep Alberta basin : based on fluid inclusion and isotopic evidence
Bibliographic record
Abstract
Deep basin Leduc Obed and Swan Hills Simonette calcite fluid inclusions yielded Th ranges of 127 to 172°C and 122 to 158°C; while saddle dolomites have Th from 136 to 148°C and 133 to 162°C, respectively. Calcite data from the subsurface suggest a 20°C/km geothermal gradient and saddle dolomite data a gradient around 23°C. Vug-filling calcites from Spray Lakes, Parker's Ridge and Big Hill, yielded Th data (128.0 to 155.1°C) similar to vug-filling cements from Obed and Simonette. Fluids in the fracture-filling saddle dolomites analysed have an average T h of 171.6°C and salinity of 17.1. Post-thrusting fractures yielded calcites with the lowest Th and salinity suggesting precipitation from cooler, largely meteoric waters. Homogenization temperature data for vug and fracture-filling from subsurface and outcrops suggest that late calcite and dolomite phases were precipitated near maximum burial, in the Paleocene. Many of the Obed and Simonette late-stage calcites and dolomites have very high 87Sr/86Sr signatures (up to 0.7370). Obed late calcites show a strong east to west increasing trend in Sr isotopes across the buildup---suggesting fault control of this margin. (Abstract shortened by UMI.)
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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 | 0.001 |
| 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".