Structural geology, stratigraphy, and gold deposits of the New Britannia Mining District of the paleoproterozoic Snow Lake arc assemblage (Snow Lake, Manitoba, Canada)
Bibliographic record
Abstract
Orogenic gold deposits in the Snow Lake area in the southeastern Trans Hudson Orogen, Manitoba, include the New Britannia deposit which, with a past production of a 1.4M oz Au (43 699 kg), is the largest Proterozoic gold deposit in Manitoba and Saskatchewan. The deposits are hosted by the ca. 1.89 Ga Paleoproterozoic Snow Lake arc (SLA) assemblage of the Flin Flon Glennie Complex (FFGC). The FFGC is bound by a sedimentary basin to the north, namely the Kisseynew Domain. It represents an oceanic protocontinent within an ancestral ocean, the Manikewan Ocean, which occupied the region between three Archean cratons (Hearne, Sask, Superior). The deposits occur within a sequence of explosive, submarine, bimodal volcanic rocks emplaced during an early episode of rifting and subsidence of the SLA. Deformation of these rocks began with their imbrication along brittle thrust faults during a D1 event. It continued during a ca. 1.84- 1.82 Ga D2 event with thrusting of the Kisseynew basin and FFGC above the colliding Sask craton. The D2 event produced a penetrative regional foliation axial planar to map-scale isoclinal folds (NorAcme Anticline), sheath-like gneiss domes along the Kisseynew-FFGC boundary, and regional southwest-directed ductile thrust faults, such as the McLeod Road Thrust. Final collision of the FFGC and Sask craton with the Superior craton during a ca. 1.83-1.80 Ga D3 event reactivated the ductile thrust faults, folded the gneiss domes, and enabled the development of an orogen-parallel regional stretching lineation during lateral flow parallel to the cold Superior craton. The New Britannia deposit and nearby gold deposits were emplaced in the hinge of the Nor-Acme Anticline early during the D2 event, were folded during tightening of the fold, stretched parallel to the regional stretching lineation, and transposed along a late crosscutting shear zone, the Howe Sound fault, which formed as a transfer fault during thrusting. The deposits formed at amphibolite facies conditions during a prograde metamorphic event that culminated during the collision of the FFGC and Sask craton with the Superior craton during the D3 event. Thus, the deposits are atypical compare to most other Proterozoic and Archean orogenic gold deposits which typically form at greenschist facies conditions.
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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 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".