Geology of the central part of the Callaghan Creek pendant, Southwestern B.C.
Bibliographic record
Abstract
Callaghan Creek pendant, about 85 k north of Vancouver, B.C., is one of many northwesterly trending volcanic and volcanic-sedimentary pendants within the southern part of the Coast Plutonic complex. Rocks within this pendant have been correlated tentatively with the Gambier Group on the basis of lithologic similarities with type sections of the Gambier rocks to the south. A crystal tuff unit in the Callaghan Creek sequence has been cut by what are thought to be genetically related hornblendite dykes for which a single K-Ar date on hornblende of 124 ± 4 m.y. was obtained. Five major rock units were recognized in the Callaghan Creek pendant. Compositions range from a rhyodacite to more abundant andesites. Generally, these rock units dip steeply to the east, strike northerly to northwesterly, and appear to form a homoclinal succession with tops to the east. The envisaged depositional environment is of explosive volcanism in an arc environment characterized by calc-alkaline volcanism which probably extended along the length of the Coast Plutonic complex during Jurassic and Early Cretaceous time. Plutonic rocks, ranging in composition from quartz diorite to granodiorite and diorite, surround the Callaghan Creek pendant. Pleistocene to Tertiary rocks overlie and locally intrude the pendant and plutonic rocks. Seven mineral occurrences were recognized in the mapped area of the Callaghan Creek pendant, three of which, the Manifold, Warman and Discovery zones, are in production by Northair Mines Limited (N.P.L.). Minor production has come from three of the more southerly occurrences; the Silver Tunnel, Millsite and Tedi Pit zones of Van Silver Explorations Limited (now in receivership). The Manifold, Warman and Discovery zones of Northair Mines and the Tedi Pit mineral occurrences of Van Silver Explorations show various structural and textural features indicating that a significant portion of the sulphides may have concentrated prior to regional metamorphism (greenschist facies) and emplacement of Coast Plutonic rocks. An apparent stratigraphic control, association with dacitic volcanics, local intercalations with exhalites (carbonate and cherte) combined with textural data and systematic variations in assay values suggest that these occurrences are volcanogenic in origin but have suffered considerable mobilization during subsequent metamorphism.
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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 | 0.002 | 0.000 |
| 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 | 0.001 |
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".