A petrological study of intrusive rocks along the Fraser Canyon near Hell's Gate, British Columbia
Bibliographic record
Abstract
A study was made of rocks outcropping along a road section in the vicinity of Hell's Gate, some 12 miles south of Boston Bar, British Columbia. Biotite schists belonging to the Hozameen group (Carboniferous or Permian in age), were the oldest rocks found. The Custer granodiorite, a heterogeneous igneous body having the average composition of a hornblende granodiorite, intrudes the biotite schists. The age of the Caster granodiorite is believed to be Upper Jurassic. Large numbers of pegmatite and aplite dykes intrude the Custer granodiorite. Two types of pegmatites, magmatic and metasomatic were distinguished. The Hell's date granodiorite, a uniform igneous body of trondjhemitic composition, intrudes the Custer granodiorite and also post dates the pegmatite and aplite dykes. The age of the Hell's Qate granodiorite is believed to be Upper Jurassic or possibly Lower Cretaceous. Sight plagioclase porphyry dykes, classified into one of three groups, (staple, multiple, and protoclastic types) were found. The plagioclase porphyry dykes are believed to be genetically related to the Hell's Gate granodiorite. Six dykes having an andesitic composition were found; the dykes have been classified into light colored and dark colored andesites. The rocks along the road section have been intensively fractured. Faulting has taken place close to the southern contact between the two granodiorites. The narrow N-S trending outcrop of Custer granodiorite in the area could possibly have been produced by faulting, and its shape suggests a horst structure, A study, using a method suggested by Gorai, was made of the plagioclase twins occurring in the Hell's Gate rocks. The conclusions drawn from this work largely confirms the conclusions drawn from the field evidence.
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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 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.003 | 0.004 |
| Science and technology studies | 0.004 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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".