Age, formation and tectonism of the Neoproterozoic Ruddock Creek zinc-lead deposit and host Windermere Supergroup, northern Monashee Mountains, southern Canadian Cordillera
Bibliographic record
Abstract
The Ruddock Creek property is located in the northern Monashee Mountains, southern British Columbia. The deposit is hosted by Neoproterozoic metasedimentary rocks of the Mica Creek succession within the Windermere Supergroup. Structurally the Ruddock Creek property is interpreted to reside within the base of the Selkirk allochthon, in the immediate hanging wall of the Monashee décollement, a crustal-scale, northeast-directed thrust-sense shear zone. The Neoproterozoic strata have been complexly folded and transposed by Mesozoic deformation. U-Pb dates for deformational events range from ca. 116 to 63 Ma (63 Ma being the end of ductile deformation). The geometry of the main sulphide body indicates that the mineralized horizon was subject to all phases of deformation and was metamorphosed to amphibolite facies. Detrital zircon geochronology provides U-Pb ages that constrain the provenance for the host Windermere Supergroup, and define a maximum depositional age of ca. 663 Ma. The 663 Ma age is not common to the North American Cordillera, and is found almost exclusively in igneous rocks in central Idaho, suggesting south to north transportation of sediment along the Neoproterozoic rifted paleo-margin of western Laurentia. The 206Pb/204Pb isotope ages of galena, pyrite and pyrrhotite from several mineralized horizons that make up the Ruddock Creek deposit indicate an Early Cambrian, 535 ± 30 Ma model age of mineralization. Different colour sphalerites and calcite were analyzed to generate a Rb/Sr errorchron with an age of ore formation of 556 ± 420 Ma. Together the maximum age of deposition, the Pb isotope ages and the Rb/Sr errorchron reveal a spatial and temporal syngenetic relationship of the deposition of the Mica Creek succession within the Selkirk allochthon and the mineralized horizon at the Ruddock Creek property. Local basement topography, such as horst and graben structures resultant from rifting related to the final phase of breakup of Rodinia, may have focused fluid flow into carbonaceous host lithology at Ruddock Creek. Local structural and stratigraphic traps, hydrothermal fluids, as well as the redox state of the basinal brines, would ultimately have localized and controlled the precipitation of the sulphides.
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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 | 0.001 | 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".