Spatial and temporal distribution of the Late Triassic to Early Jurassic porphyry-style mineralized plutons of the Quesnel terrane, British Columbia: inferences on tectonic controls and porphyry prospectivity
Bibliographic record
Abstract
Middle Triassic to Middle Jurassic arc-related sequences of the Quesnel terrane, British Columbia, host numerous major porphyry deposits. In south-central Quesnel terrane, temporal and spatial distribution of deposits have been related to eastward-younging, subparallel belts of coeval, compositionally similar associated plutonic suites corresponding to shallowing of Cache Creek subduction beneath the Quesnel terrane. Changes in alkalinity of arc magmatism is best explained by ingress of hot primitive mantle due to tectonic processes (i.e. slab rollback, tears, or break-off); however, such mechanisms are inconsistent with eastward migration of magmatism within a dominantly submergent (largely marine) arc built above east-dipping subduction. Furthermore, the plutonic belts were defined for the southern Quesnel terrane and are far less apparent farther north. Notably, the plutonic belts are defined on the oldest exposed intrusions, with their distribution correlating to the overall eastward-younging of fault-bounded country-rock panels. In this paper, it is suggested that the axis of arc magmatism could remain largely static relative to the leading edge of the Quesnel terrane, with the observed distribution of southern Quesnel plutonism explained by post-depositional structural arrangement of fault-bounded blocks. This model raises the possibility of undiscovered early mineralization being buried beneath Rhaetian and younger sequences exposed in central and eastern Quesnel fault panels.
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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 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".