Detrital petrology and mineralogy of the cored intervals of Lower Cretaceous sedimentary rocks in the Esperanto K-78, Hesper I-92, and South Griffin J-13 wells, Scotian Shelf
Bibliographic record
Abstract
Short conventional cores have been studied from the Middle Member of the Missisauga Formation from the Esperanto K-78 and South Griffin J-13 wells and from the lower Naskapi Member in Hesper I-52. Cores were described and photographs. Samples were examined by petrographic microscope and in some cases by SEM and electron microprobe. Tidal parasequences are found in cores from Esperanto K-78 and South Griffin J-13, whereas at Hesper I-52, a shoreface parasequence was sampled. The stratigraphic position of the core from Hesper I-52 was reassessed, with the aid of new biostratigraphic data; the core does not sample the top-Missisauga unconformity, as previous interpreted. Features of the detrital petrology are similar to equivalent stratigraphic levels in Peskowesk A-99, including the low abundance of stable heavy minerals, the preponderance of K-feldspar relative to plagioclase, and the abundance of lithic clasts of microgranite and rhyolite. The new data confirms that there was a change in sediment supply in the Upper Member of the Missisauga Formation. Diagenesis of the sandstones is characterized by low abundances of diagenetic carbonates and porosity principally cemented by clay minerals. The paragenetic sequence suggests that kaolinite, calcite, siderite and pyrite are the principal eogenetic minerals, followed by quartz overgrowths, chlorite, illite, and further silica cement. In addition, silica cement is abundant at South Griffin J-13. The occurrence of diagenetic sphalerite at South Griffin J-13 suggests hot, saline basinal fluids were present. Collectively, these data show that the previous detailed interpretations of detrital petrology and diagenesis from the Peskowesk A-99 extend to a large area of the eastern Scotian Basin.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".