3D seismic evidence for multiple movement directions and detached extension during Mesozoic rifting in theJeanne d'Arc basin, offshore Newfoundland, Canada
Bibliographic record
Abstract
The Jeanne d’Arc rift basin formed during the breakup of Pangea from Late Triassic through Early Cretaceous time. My study focuses on the Flying Foam region, which lies east of the NNE-striking, ESE-dipping Mercury fault in the northwestern section of the basin. Multiple phases of deformation, along with the presence of evaporites within the latest Triassic to earliest Jurassic Argo Formation, make it difficult to constrain the timing of tectonic activity and the extension direction in the basin. Using 3D seismic data (donated by WesternGeco). I focused on constraining the slip on faults through time to better understand the evolution of the basin. Previous 3D seismic studies have identified corrugations subparallel to the slip direction on the surface of a fault. I identified corrugations on the Mercury fault that indicate an ESE-movement direction during the first phase of rifting from the Late Triassic to the earliest Jurassic. During the second phase of rifting (earliest Jurassic – latest Jurassic), a relay ramp formed in the southern part of the study area, between the basement-involved Mercury and Murre faults, resulting in a northeastward tilt of strata in the hanging wall of the Mercury fault. During the third phase of rifting (latest Jurassic – Early Cretaceous), evaporites within the Argo formation acted as a detachment fault zone. N-directed gravity sliding along the detachment fault zone tilt resulted in NE-oriented extension. Concurrently, the N-striking, basement-involved Flying Foam fault imparted a component of top-to-the east motion on the detachment fault zone. This resulted in geographic and temporal variation in the movement direction on the detachment fault zone from the latest Jurassic through the Early Cretaceous. As the Flying Foam fault propagated southward, the Flying Foam anticline formed above it. Breakup in the northern part of the Jeanne d’Arc basin occurred in the earliest Aptian. However basement-involved faulting with a dip-slip normal component continued through the Aptian, and offset of a late Albian unconformity indicates that NNE-directed detached faulting continued into the Albian.
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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".