Characterization of a ~1 billion year old carbonate ramp in the Brock Inlier, Arctic Canada
Bibliographic record
Abstract
The Brock Inlier is an uplifted region east of Darnley Bay, Northwest Territories, composed of mainly carbonate and siliciclastic sedimentary rocks of the early Neoproterozoic (~1000-720 Ma) Shaler Supergroup.Strata were deposited in a large embayment (Amundsen Basin), an epeiric sea within the supercontinent Rodinia.Strata in the Brock Inlier correlate with other inliers of the Shaler Supergroup to the northeast on Victoria and Banks islands, and with the Mackenzie Mountains Supergroup, in the northern Cordillera, to the southwest.The ~900 Ma Boot Inlet Formation, occurs stratigraphically in the middle of the Shaler Supergroup and facies are interpreted to represent deposition along a storm-dominated carbonate ramp.Four transgressiveregressive sequences are preserved in approximately 400 m of section.Stable isotope analysis of 131 carbonate rock samples from the Boot Inlet Formation yield 𝛅 13 C values ranging from -0.2 to 7.6‰, trending positively upsection.Significant covariation between 𝛅 13 C and 𝛅 18 O values is not observed, suggesting that diagenesis did not significantly modify the primary marine isotopic signal.𝛅 13 C and 𝛅 18 O data coupled with lithostratigraphy and a transgressive-regressive sequence stratigraphic framework corroborate correlations between the lower Boot Inlet Formation on Victoria Island (~400km to the northeast) and the lower part of the Little Dal Group in the Mackenzie Mountains (~600km to the southwest).This establishes the broad (>1200km wide) regional distribution of a carbonate platform that extended from the Amundsen Basin, to a contemporary platform in the Mackenzie Basin.These early Neoproterozoic sedimentary rocks may record a transitional phase from low to high 𝛅 13 C isotopic iii variability reflecting heightened sensitivity to fluxes caused by biogeochemical perturbations.
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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 | 0.003 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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".