The Spatial and Temporal Evolution of Mixed Carbonate‐Clastic Mud‐Dominated Basin Fill Successions: The Middle to Late Devonian Shelf Margin, Western Canada
Bibliographic record
Abstract
ABSTRACT Middle to Upper Devonian strata preserved in the Mackenzie Mountains and adjacent basins in the Northwest Territories, Canada, record a transgressive sequence set of shelfal marine deposits in a low latitude basin margin transitioning from drift to convergence basin phase. The interplay between shallow‐water carbonate and clastic depositional systems and offshore organic‐matter‐rich mudstone deposits is described within a chronostratigraphic and sequence stratigraphic framework. Relative rise of sealevel resulted in backstepping and flooding of a carbonate ramp by biosiliceous and organic‐matter‐rich mudstones. Steep isolated stromatoporoid carbonate platforms show rapid lateral facies transitions associated with these transgressions. At times of tectonically induced relative falls in sea level and exposure of updip carbonate deposits, clastic sediment was transported across the basin margin, resulting in the deposition of mud‐rich subaqueous clinothems. Transgression of these clinothems led to the deposition of onlapping wedges of organic‐matter‐rich mudstones. Three main sequences are developed within this overall transgressive sequence set, and these three sequences can be correlated from outcrop to subsurface, both in the adjacent Peel and Mackenzie Valley Basins as well as into the subsurface strata of the Horn River and Liard Basins, which are prolific hydrocarbon basins to the south. Each depositional system develops distinct seismic geomorphologies and allows for the mapping of favourable lithofacies belts with regard to identifying carbonate deposits (aquifers and petroleum reservoirs) and organic‐matter‐rich mudstones (source rocks and unconventional reservoirs). The workflows and regional chronostratigraphic framework may be applied to coeval deposits along the divergent and convergent margins of Laurentian and Gondwanan cratons preserved across the globe.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 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".