Regional deposition and diagenesis of Lower Ordovician epeiric, platform carbonates: The Romaine Formation, Mingan Archipelago and Subsurface Anticosti Island, eastern Quebec.
Bibliographic record
Abstract
This study integrates Mingan Islands outcrop and Anticosti subcrop facies analysis with petrography and stable isotope geochemistry to establish a current framework for the Lower Ordovician Romaine Formation in the western Anticosti Basin. Inner to midshelf strata form a wedge, thinning from midshelf to inner shelf and from west to east. A basal transgressive unit onlaps Precambrian basement; it is overlain by muddy, bioclastic limestones and dolostones arranged in two depositional sequences. In the lower sequence the transgressive lag is overlain by a peritidal unit (not developed in the inner shelf), followed by a subtidal unit and a second peritidal unit; the sequence boundary is nonerosive. In the upper sequence, peritidai facies are overlain in the west by a second subtidal unit, which is truncated from west to east by the regional unconformity. In the inner shelf, carbonates are pervasively dolomitized; in the midshelf, peritidal units are pervasively dolomitized but subtidal units are partially dolomitized. Petrography shows two stages of dolomitization, an early, synsedimentary to shallow burial stage characterized by planar replacement dolomites and a late stage characterized by nonplanar replacement dolomite, and pore and fracture filling dolomite cements. Stable Isotope data suggest two phases of late stage dolomitization, the first resulting from intraformational waters warmed by burial, and the second from warm basin derived brines.
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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 | 0.002 |
| 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) | 0.002 | 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".