Isotopic and fluid inclusion analysis of diagenetic mineral phases of the Upper Devonian Jean Marie Member (Redknife Formation) in the July Lake area of northeastern British Columbia
Bibliographic record
Abstract
This report provides a summary of both the isotopic and fluid inclusion analyses of diagenetic mineral phases in the Upper Devonian Jean Marie Member (Redknife Formation) from the July Lake area of northeastern British Columbia. These mineral phases are part of two diagenetic realms. The first realm includes calcite cements that precipitated within pores in limestone of the Jean Marie Member. These limestones occur regionally throughout northeastern British Columbia, northwestern Alberta and the southern part of the Northwest Territories. These calcite cements include, in order of formation, radiaxial bladed calcite, non-ferroan equant calcite and ferroan equant calcite. The radiaxial bladed calcite cements occur selectively in patch reef limestones and are interpreted as having precipitated from marine fluids that flowed through an open reef framework. The regional distribution of the equant calcite cements suggests a passive, "closed system" origin, most likely as a by-product of pressure solution during burial. The succession from non-ferroan to ferroan equant calcite cements provides a template to which the position, within the paragenetic succession, of the diagenetic phases of the second realm can be related. The second diagenetic realm includes mineral phases that are interpreted to have formed from the upward flow of relatively hot fluids along faults or fault-associated fractures. The diagenetic phases in this realm include, in paragenetic order, matrix replacement dolomites and saddle dolomite cements, followed by low concentrations of sphalerite (or galena), barite, and dickite cements. Seventy-two samples were selected from 18 cores for stable (carbon and oxygen) and radiogenic (strontium) isotopic analysis. d13C and d18O values are reported for 67 dolomite and calcite components, or combinations of these components. Strontium isotopic ratios (87Sr/86Sr) are reported for 58 samples of dolomite, calcite, and barite. Twenty-two doubly polished thin sections were examined for fluid inclusion microthermometry. Final melting temperatures and homogenization temperatures were measured for non ferroan and ferroan equant calcite cements, saddle dolomite cement, sphalerite, and barite.
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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 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".