Crustal structure and formation of the southeast Newfoundland continental margin
Bibliographic record
Abstract
The discrepancy in the correlation of lithostratigraphy and seismic stratigraphy ofthe B Marker (limestone) Member on the eastem flank ofthe Hibemia oilfield is studied using available 3d seismic profiles and the log data fi-om 16 wells across the Jeanne d'Arc Basin. Unlike the previous studies which suggested that the B Marker was deposited as a time synchronous lithology across basin, detailed seismic stratigraphic and well analysis revealed that the marker was in fact deposited as a mildly diachronous unit. Four seismic traces (S1-S4) are recognized within the stratigraphic range ofthe proposed B Marker seismic event. A Carbonate Ramp Facies Model is proposed, incorporating these traces, for the basin-wide sedimentation ofthe B Marker which explains in a precise manner, the notable lithological variations ofthe marker in various exploration wells across the Jeanne d'Arc Basin. The B Marker was deposited during a relative rise of base level within the basin, coincident with a rise of global sea level during the Valanginian. This deposition is summarized by four discrete events (S1-S4). S1 marks the end of a phase of regression in the basin, and beginning of a transgressive phase of marine deposition. Limestone deposited during S1 was confined to a narrow E-W trending belt in the northem portion ofthe basin. During S2 landward migration ofthe shoreline southward, caused the deposition of shale over a wider E-W trending belt of limestone in the north. During S3 a very broad E-W trending belt of oolitic limestone blanketed the southem shallow shelf, and shingled above thin-bedded limestones (in S1 and S2). This geometry is interpreted as a subtle depositional hinge zone, which migrated south because ofthe stick slip on a master fault and uplift on stmctural culminations in the southem areas ofthe basin. This resulted in the lateral gradation of B Marker limestone into sandstone fiirther north, during ensuing transgression fi*om S1 to S3. S4 marks the peak of transgression within the basin, and in the widest coverage ofthe deeper shelf across basin. \n
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".