Tectono-depositional characterization and sedimentary provenance of the Mesoproterozoic Fury and Hecla Basin, Nunavut, Canada
Bibliographic record
Abstract
Understanding the original depositional environments, architecture, and sediment sources of intracratonic basins is integral to terrane analysis in Precambrian cratons. Proterozoic intracratonic basins are widespread throughout Arctic North America, yet their inception and evolution are poorly understood. The late Mesoproterozoic amalgamation of the supercontinent Rodinia represents, specifically, an exemplary time to investigate intracratonic basin development due to many basins being formed. Four basins in eastern arctic Canada and Greenland, known as the Bylot basins, are thought to be genetically linked due to broadly similar lithologies, age, and geographic proximity. Southernmost in this basin system is the Fury and Hecla Basin, which straddles the homonymous strait and is exposed on Baffin Island and Melville Peninsula. Establishing a correlative framework between the Fury and Hecla Basin and the better characterized Borden Basin is key to a refined understanding of the broader Bylot basins. The late Mesoproterozoic strata filling the Fury and Hecla basin, cumulatively known as the Fury and Hecla Group, comprise six formations: Nyeboe, Sikosak Bay, Hansen, Agu Bay, Whyte Inlet, and Autridge; of these, three (the Nyeboe, Sikosak Bay, and Whyte Inlet formations) are sandstone-dominated. Facies analysis indicates that the lowermost Nyeboe Formation records a range of depositional environments including terrestrial, backshore eolian, marine intertidal, wave-dominated marine shelf, and marine-offshore transitional. The Sikosak Bay and Whyte Inlet formations were largely deposited in a wave-dominated marine-shelf realm and show evidence of large sandwave buildup due to prolonged longshore drift. Seven sandstone samples were analyzed for detrital zircon U-Pb geochronology from the Fury and Hecla Group, and yielded grains with ages ranging from ~3350 to ~1695 Ma. Altogether, detrital zircon grains show a bimodal age distribution with peaks at ~2.7 Ga and ~1.9 Ga. Notably, the Archean age peak is more prominent in the lower stratigraphy, whereas the Paleoproterozoic peak is more significant in the upper stratigraphy. Facies and provenance analyses suggest that the Fury and Hecla Basin opened in a half- graben setting, with its master fault located on the present-day northern side of the basin. Initially, sediment was likely derived from erosion of local basement rocks. Facies mapping suggests that the basin expanded its catchment area with time. This trend was accompanied by increasing recycling of older siliciclastic successions from nearby basins – a provenance pattern that dominated over local sediment sourcing in the upper strata. As such, despite broadly similar lithologies and age, the Fury and Hecla Basin shows different depositional environments and a unique evolution, when compared to the known data, from the other Bylot basins.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.004 | 0.001 |
| Scholarly communication | 0.002 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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".