Sequence stratigraphic, lithostratigraphic and stable isotope analysis of the Minto Inlet Formation and Kilian Formation of the Shaler Supergroup, Northwest Territories
Bibliographic record
Abstract
The Minto Inlet Formation (<891 Ma; >762 Ma) is a ~300 m thick unit of predominantly claystone, siltstone, carbonate rock and sulphate evaporite rock.Three informal, regionally extensive members are defined: the lower evaporite, carbonate and upper evaporite members.The Kilian Formation (<795 Ma; >723 Ma) is a >500 m thick succession that is compositionally similar to the Minto Inlet Formation, and is here subdivided into 4 third-order depositional sequences and their respective systems tracts.Both formations reflect deposition on a subtidal to supratidal ramp, influenced by siliciclastic supply, arid climate and tectono-eustasy.Sulphate samples from the Minto Inlet Formation are characterized by low average δ 34 S (~17‰) with little secular variability (σ = 1.36‰, n = 67), whereas samples from the Kilian Formation show high average δ 34 S (~26‰) and high secular variability (σ= 8.63‰, n = 67).Biogeochemical models indicate that a temporary reorganization of the sulphur flux out of the ocean, characterized by an initial decrease in the pyrite burial fraction (ƒ p ) from ~1 to ~0.3, was initiated prior to the deposition of the Minto Inlet Formation, and a return of ƒ p values near 1 (recorded in the Kilian Formation), is inferred to have occurred during deposition of the intervening Wynniatt Formation.These changes are interpreted to be the result of widespread and thick (basin-scale) evaporite deposition during the middle Neoproterozoic, possibly driven by the migration of Rodinia and the multiple intracratonic basins which it hosted across low latitude arid climate belts.I would like to thank my supervisors Rob Rainbird and George Dix for allowing me to attempt a project of this scale.Thanks to Rob for initially taking me on to the Victoria Island project, his patience and his faith in me and my work have been infinite.Thank you to Boz Wing for all his multiple, multiple sulphur isotope consultations and allowing me to use lab space at McGill for the very messy and long process of carbonate associated sulphate.I would like to thank Jean Bedard for putting me up in his home both before and after my first field season and for all of the "safety meetings" while in the field.Thank you to Etienne Girard for taking time to introduce me to Arc GIS and for sacrificing the bones of his ankle for our field internet connection.Thank you to Sharon, Rosanda and Susie for the gourmet all-you-can-eat meals every night in the field.
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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 | 0.001 | 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) | 0.002 | 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".