ABSTRACT OF THE THESIS Synrift and Postrift Deformation of the Fundy Rift Basin, Nova Scotia, Canada: Evidence from Mesoscale Fracture Data
Bibliographic record
Abstract
Previous studies have shown that multiple phases of deformation affected the passive margin of eastern North America during and after rifting. The number, style and timing of postrift deformational events, however, are poorly constrained. To address this issue, I collected fracture data (faults with slickenlines, conjugate faults and tension fractures) from the Fundy rift basin and applied a stress inversion method. My analysis of these data suggests that at least two distinct faulting regimes and tectonic phases affected the basin during and after rifting. The relative chronology of the tectonic phases, based on crosscutting relationships and overprinting slickenlines, is: 1) rifting characterized by normal faulting and produced by SE displacement of the hanging wall, and 2) basin inversion, characterized by strike-slip faulting and produced by an average NE movement of the hanging wall. The relationship between the strain states and displacement directions suggests that counterclockwise vertical-axes rotations of fractures likely occurred during the second event due to left-lateral strike slip on the border-fault zone. Seismic data from the Fundy, Orpheus and Scotian basins, which share a common border-fault zone, provide insight on the absolute timing of the tectonic phases. The
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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 | 0.001 | 0.001 |
| 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".