Deformational history, stratigraphic correlations and geochemistry of eastern Quesnel terrane rocks in the Crooked Lake area, east central British Columbia, Canada
Bibliographic record
Abstract
The Eureka Peak are lies within the Quesnel terrane of the Intermontane Belt, adjacent to the Omineca Belt - Intermontane Belt tectonic boundary. It represents a convergent zone between the arc related Quesnel terrane and parautochthonous Barkerville terrane. The terrane boundary is defined by the Eureka thrust Underlying the area are middle Triassic to early Jurassic sedimentary and volcanic rocks, represented by the Quesnel River Group and Takla Group, respectively. Petrologic and geochemical studies of the Takla Group volcanics suggest protoliths of island arc and marginal basin affinities. The Quesnel terrane structurally overlies Hadrynian to early Paleozoic metasediments of the Snowshoe Group (Barkerville terrane). The base of the Quesnel terrane is marked by mylonitized mafic and ultramafic rocks of the Crooked Amphibolite. Correlation of features across the plate boundary has established the structural continuity in the region, and recognition of structural phases common to both terranes which developed in response to plate convergence. The deformational history involves two phases of coaxial folding of a mechanically heterogeneous lithologic sequence, accompanied by extensive pressure solution, and later overprinting by NW trending extensional fractures. Synchronous to F₁, detachment surfaces developed along major stratigraphic contacts due to contrasting Theologies of adjacent lithologies. Second phase deformation established the regional map pattern, folding the detachment surfaces and the tectonic boundary. Synchronous to deformation, regional metamorphism is evidenced by the growth of minerals characteristic of amphibolite fades in the Barkerville terrane, and greenschist fades in the Quesnel terrane. Dissipation of heat from the underlying sequences is suggested by the rapid transition in metamorphic grade observed across the boundary. Cleavage surfaces have acted as a locus along which pressure solution has occurred, providing a pathway for the escape of fluids generated during metamorphism. Deposition of material within extensional fractures occurred throughout the deformational history. Fracturing is prominent adjacent to the Quesnel River Group and Takla Group contact, where the viscosity contrast between the two lithologies provided an effective barrier to extensive fluid flow. Concentration of fluids along the contact may have had a buoying effect on the volcanics, allowing furter eastward translation during deformation.
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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 | 0.003 |
| Science and technology studies | 0.002 | 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) | 0.003 | 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".