Pre- and post-kimberlite emplacement thermal history of Cretaceous and Tertiary sediments, Lac de Gras, Northwest Territories, Canada
Bibliographic record
Abstract
Optical analyses of contemporaneous, wood-derived organic matter, and older Cretaceous organic matter within shale xenoliths in DO-18 kimberlite, Lac de Gras, Northwest Territories, Canada, show that the kimberlite has undergone insignificant, if any burial since emplacement, and that Cretaceous strata in the area, prior to kimberlite emplacement, had reached thermal maturity levels equivalent to ~ 0.25-0.30%Ro vitrinite.This level of maturity is corroborated by VIS fluorescence of sporinites, dinoflagellates and prasinophytes within the Cretaceous xenoliths.Porosity of shale xenoliths recovered from a number of kimberlites average 26 %.All data are consistent with a thickness of ~ > 1 to 1.5 km of Cretaceous strata (~ Albian to Maastrichtian ?) in the study area, most of which was likely eroded sometime prior to kimberlite emplacement (see Sweet et al., 2003).
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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 | 0.002 | 0.002 |
| 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".