The southern margin of Flemish Cap, offshore Newfoundland: processing and interpretation of seismological data provide insights into the rifting evolution
Bibliographic record
Abstract
The Newfoundland/Iberia conjugate continental margins developed during Jurassic and Cretaceous time. They are good places to study rifted margins since they are non-volcanic, so that extensional crustal structures are not altered or obscured by magmatic processes. The "ERABLE" seismic reflection survey was recorded in the Newfoundland basin by the Geological Survey of Canada and IFREMER in 1992.1 have processed and interpreted three ERABLE profiles extending from the southern margin of Flemish Cap extending into the Newfoundland Basin. Various types of noise such as multiples and side scattered reflections posed challenges for producing a seismic section that represents subsurface reflectivity. F-k and radon filters improve the signal to noise ratio in deep water, but were less successful in the shelf region of the Flemish Cap. -- The final processed lines have provided a more comprehensive data coverage along the southern margin of Flemish Cap. Combining these data with SCREECH seismic profiles, two ODP drill sites, and other geophysical data have allowed the mapping of distinct zones of continental, transitional, and oceanic crust in this region. I compare these results to crustal boundaries on the Iberia margin that are well constrained from detailed seismic and drilling. -- My results indicate asymmetry in the conjugate pair, with the zone of extended continental crust and transitional crust being much wider on the Iberian margin compared to the Newfoundland margin. Also, there is evidence of possible detachment faulting on both margins, although less wide spread on the Newfoundland margin. I propose either a simple shear or simple shear/pure shear combination model involving a westward dipping detachment fault, with the Newfoundland margin acting as the upper plate. -- However, the Newfoundland margin has a long and complex rifting history that cannot be explained by only 2-D rifting models, thus a Late Jurassic to Early Cretaceous rifting and break-up model is presented as an attempt to account for the present day structure of the southern margin of Flemish Cap.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".