Sedimentology and Diagenesis of the Scollard Sandstones in the Red Deer Valley Area, Central Alberta
Bibliographic record
Abstract
ABSTRACT The Scollard Formation sandstones in the Red Deer Valley region of central Alberta are composed of lithic arenites and sublitharenites, which accumulated in braided to meandering fluvial environments. The early diagenesis of the Scollard sandstones is characterized by initial mechanical compaction; calcite cementation; dissolution of detrital feldspars along with the dissolution of volcanic fragments; authigenic quartz overgrowth; and formation of authigenic clay minerals as coatings, rims, pore-linings, and pore-fills. Late diagenesis is dominated by continued precipitation of authigenic quartz and pore-filling kaolinite; dissolution of feldspar grains; corrosion and dissolution of quartz grains and authigenic silica; alteration of mica, biotite and iron-bearing minerals; dissolution of calcite cement; and precipitation of hematite cement. The limited conversion of smectite to illite, as well as the weak albitization of K-feldspar imply maximum burial temperatures of less than 120°C. The detrital and authigenic mineral composition coupled with oxygen and carbon isotope analyses indicate that significant climatic fluctuations between relatively wetter and drier conditions appear to have occurred during the accumulation of the Scollard Formation. Wetter climatic conditions are interpreted for the arenites with higher amounts of mono- and/or polycrystalline quartz, kaolinite, and quartz overgrowth. Drier climatic conditions are inferred for the arenites with lesser percentages of quartz but higher amounts of authigenic smectite. Since neither the petrographic (framework grains) nor the SEM-XRD (authigenic clay mineralogy) data sets can address the issue of paleoclimate in an univocal manner, the key for such interpretations is the correlation between the detrital and authigenic mineral constituents. The good correlation between the two constituent types suggests that the precipitation of authigenic clay minerals took place relatively soon after burial, which is in agreement with the meteoric origin of the diagenetic fluids that is indicated by the 18O stable isotope data. End_Page 45-------------------------
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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 | 0.000 |
| 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".