Abstract: Late Tournaisian 'pop-up' and collapse in a transpressional strike-slip zone: the Indian Mountain Deformed Zone, southeast New Brunswick
Bibliographic record
Abstract
The structural history of the Indian Mountain Deformed Zone in southeast New Brunswick is intimately related to late Tournaisian stratigraphy, particularly the deposition of the Sussex Group. The Sussex Group consists of three formations: the Stilesville Formation, a basal conglomerate-megabreccia resting on a paleosol on crystalline pre-Carboniferous basement is upward-fining into a grey-red-green mudstone dominated Gautreau Formation, which is overlain by an upward-coarsening Briggs Cross Formation, starting out as conglomerate, but eventually containing megabreccia. The megabreccia of the Briggs Cross Formation contains clasts recording extensive recycling of the Stilesville Formation. Clast-size (up to 10 metres diameter) implies a distal relationship between breccias and source. Early deformation of the lower part of the Sussex Group (Stilesville and Gautreau formations) is related to thrusts bringing basement slices over cover, and Stilesville Formation over Gautreau Formation. Thrusts are predominantly northward-verging, but southwardand eastward-verging structures are also seen. This thrusting appears to be associated with the recycling of basement and Stilesville Formation clasts in the upper part of the Briggs Cross Formation, and this is consistent with the plastic nature of folds developed in some lithologies, indicating deformation before dewatering was complete. Thrusts throughout the Indian Mountain Deformed Zone are overprinted by normal faults showing downthrow to the south, east, and west. These same faults cross-cut the Briggs Cross Formation and therefore post-date it. The structural history correlated with the stratigraphy indicate rapid uplift of basement during the end-Sussex Group period, with basement thrust slices over-riding their own debris, followed by collapse of the same ‘pop-up’ structure. The timing of this collapse is not well constrained, but is most probably early Visean.
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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 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".