Non-hydrothermal Saddle Dolomite:Petrological and Geochemical Evidence from the Ordovician Yeoman Formation,Southeastern Saskatchewan,Canada
Bibliographic record
Abstract
Minor saddle dolomite cements are identified in the Upper Ordovician Yeoman carbonate rocks in southeastern Saskatchewan,Canada.These saddle dolomite cements are restricted to upper part of the Yeoman Formation,in a 20~30 m zone of dolomite rocks,and they are conspicuously absent both in the overlying and underlain carbonate strata,suggesting their precipitation in a relatively closed system.These Ordovician saddle dolomite cements are characterized by δ13C values(-0.2‰ to 0.9 ‰ PDB)and Sr isotopic ratios(0.7082 to 0.7090)similar to those of their host replacement dolomites,indicating the sources of carbon and strontium for the saddle dolomite cements were mostly from precursor host dolomite rocks via pressure dissolution.In addition,the measured homogenization temperatures from the saddle dolomite cements vary from 99 to 105℃,which could be accounted for by the normal burial temperatures in the region.Based on these data and observations,the saddle dolomite cements in the Upper Ordovician Yeoman Formation in southeastern Saskatchewan are interpreted to be related to cannibalization of earlier replacement dolomite through chemical compaction in a relatively closed system during burial,rather than related to hydrothermal activities documented elsewhere in the Western Canada Sedimentary Basin.The occurrences of saddle dolomite,therefore,are not necessarily indicative of hydrothermal activity or fluids;nor are all saddle dolomites definitely related to hydrothermal fluids.
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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 | 0.003 | 0.006 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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".