Geology of the Clyde-Cockburn Land map area, north-central Baffin Island, Nunavut
Bibliographic record
Abstract
Remnants of a dissected peneplain, tilted up to the northeast, cap low, hummocky to mountainous ice-capped terrane. At least 90% of the map area is an Archean-Aphebian crystalline complex in which at least three episodes of granitic intrusion, each probably accompanied by anatexis, are represented. The oldest recognized major unit is nebulitic granitic migmatite (ca. 3.7-2.85 Ga). The migmatite, foliated granitic intrusions (ca. 2.85 Ga), and deformed amphibolite dykes are overlain unconformably by the Archean Mary River Group (2.74-2.72 Ga), a bimodal greenstone sequence containing komatiite and mafic and ultramafic intrusions. Slightly younger (2.71 Ga) massive monzogranite and late Aphebian granite and charnockite, and the older foliated granitic intrusions represent melts formed from older crust. Most of the granitic intrusions, including the 1.9-1.8 Ga Cumberland Batholith to the south, and the Mary River Group and associated igneous rocks, were emplaced in volcanic arc environments of active continental margins. The charnockites may include both metamorphosed Archean plutons and late synorogenic dry-melt, late Aphebian plutons. The late Aphebian Piling Group (1.9 Ga) contains a thin lower quartzite-dolostone shelf sequence, and a thick upper greywacke-shale turbidite sequence (with a basal mafic-ultramafic unit) deposited in a foredeep or back arc basin. The Neohelikian Bylot Supergroup (1.27-1.23 Ga) is chiefly fluvial quartz arenite, basinal shale, and shelf dolostone deposited in coarsening- and shallowing-up cycles. Northwest- trending Franklin (723 Ma) diabase dykes have slight chemical differences which may have resulted in selective magnetic overprinting of specific (Borden) dykes. Thin Cambro-Ordovician shelf carbonate and quartz arenite blanket the western margin of the area. Metamorphic grade ranges from subgreenschist to granulite (about 0.8 GPa, 775°C Seven of the eight major structural domains recognized in the Committee and Baffin orogens on Baffin Island are represented in the map area. Both orogens extend into Melville Peninsula and western and northwestern Greenland; the Baffin Orogen also extends into northern Quebec-Labrador. Related major shear zones probably include some sutures. The Milne Inlet Trough (domain 8) is the southeast extension of the Neohelikian Borden Rift Basin, which developed as an aulacogen along the western boundary of domain 7 during the opening of the Poseidon Ocean to the northwest. Large high grade iron deposits occur at Mary River, and smaller ones are present chiefly in the western part of the map area. Lead-zinc mineralization occurs in the Bylot Supergroup along the north edge of the map area and in the Piling Group just south of the map area. Traces of lead-zinc-copper, molybdenum, nickel, silver, and gold occur locally.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| 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) | 0.030 | 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 teacher head, 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".