Along-strike variations and internal details of chevron-style, flexural-slip thrust-propagation folds within the southern Livingstone Range anticlinorium, a paleohydrocarbon reservoir in southern Alberta Foothills, Canada
Bibliographic record
Abstract
Abstract The Livingstone Range anticlinorium marks a hanging-wall ramp across which the Livingstone thrust cuts up eastward approximately 1000 m (∼3280 ft) between regional decollements in the Devonian and the Jurassic strata. It is well exposed and provides actualistic models for exploration of analogous subsurface structures. More than 30 km (<19 mi) of detailed mapping along strike reveals generally gradual changes, punctuated by abrupt terminations or offsets of structures at northeast- to east-trending tear faults, interpreted to be reactivated basement faults. Some folds plunge out at tear faults, forming domal culminations between them. Hinge zones of chevron-style, flexural-slip thrust-propagation folds display a distinctive pattern of ramp-flat thrusting comprising stacked detachment thrusts, each of which emerges from a different zone of interbed slip in the backlimb and deflects the hinge zone eastward. Each successively lower detachment thrust dies out in the hinge zone just below an overlying one. Displacements on the detachments, rotation of fold limbs, and interbed flexural slip were integrated kinematically. Thrust-propagation folding involved a form of cataclastic flow: individual blocks of rock delimited by faults, joints, and sheared bedding surfaces underwent minor relative displacements with little or no internal deformation, despite large translations and rotations of the thrust sheet. Pressure solution and vein formation were widespread but were minor components of the deformation. Complex fracturing within the anticlines is dominated by conspicuous widely spaced (∼150 m [∼490 ft]) transverse (east-northeast–striking) zones of intense fracturing that transect hinge zones and limbs. These permeable zones likely originated by reactivation of basement faults, and their significance may not be predictable by curvature analysis.
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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 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| 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".