Insight on the chemostratigraphy of the volcanic and intrusive rocks of the Lalor auriferous volcanogenic massive-sulphide deposit host succession, Snow Lake, Manitoba
Bibliographic record
Abstract
Lalor is a recently discovered auriferous Zn-Cu volcanogenic massive-sulphide deposit. It is located in the Paleoproterozoic Snow Lake arc assemblage, host to numerous past producing Cu-Zn and Zn-Cu volcanogenic massive-sulphide deposits. With an estimated tonnage of 25 Mt of ore (reserves+resources) including 73 t Au, Lalor is the largest volcanogenic massive-sulphide deposit in the Snow Lake area and its Au-rich nature provides a unique opportunity to document processes responsible for precious-metal enrichment in volcanogenic massive-sulphide systems. The Lalor deposit host rocks are predominantly volcanic (± intrusive) rocks that have been variably altered, deformed, and metamorphosed to amphibolite grade. A combination of immobile element geochemistry and petrographic observations is necessary to properly characterize the volcanic rocks due to major postemplacement modifications. Seven distinct chemostratigraphic units and two postvolcanogenic massive-sulphide intrusive (dyke) units are present in the Lalor host succession. Mafic to felsic volcanic units have calc-alkaline to transitional magmatic affinities. Some of these units are compositionally similar to the Moore basalt (units M1a and M1b) and Powderhouse dacite (unit F2) which represent the footwall of the Chisel, Chisel North, Ghost, and Lost volcanogenic massive-sulphide deposits; this suggests that the Lalor deposit is located within the volcanogenic massive-sulphide-fertile uppermost portion of the lower Chisel subsequence. The presence of massive-sulphide ore lenses in calc-alkaline mafic rocks lying above the Powderhouse dacite-like unit indicates the continuation of volcanogenic massive-sulphide-forming hydrothermal activity after the cessation of felsic volcanism in the lower Chisel subsequence. The presence of dykes with a trace-element signature similar to that of the Threehouse basalt, which is present immediately above the other volcanogenic massive-sulphide deposits of the lower Chisel subsequence, suggests the presence of this unit at a higher stratigraphic position in the now structurally truncated sequence.
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 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".