Stratigraphy, geochronology, and geochemistry of the Georgie River area, northwest British Columbia, and implications for mineral exploration
Bibliographic record
Abstract
Georgie River area is underlain by greenschist facies volcanic, clastic, and plutonic rock. High precision UPb isotopic ages on zircon enable regional stratigraphic correlation by constraining the Lower to lower Middle Jurassic depositional history. A sample from pyroxene-phyric tholeiitic basalt is Upper Triassic and (or) Lower Jurassic in age; its upper age limit is constrained by a crosscutting intrusion dated at 189.8 ± 0.3 Ma. The Bulldog Creek pluton, at 193.0 ± 0.3 Ma, is significantly older than the previously reported KAr age. Hazelton Group strata include a coarse-grained volcaniclastic and volcanic unit overlain by a fine-grained clastic and bimodal volcanic flow unit. The coarse volaniclastic unit is coeval and probably cogenetic with the Outram Lake porphyry intrusion (189.7 ± 0.3 Ma) and near the top includes andesitic tuff (189.8 ± 0.6 Ma). These data constrain the age of deposition of the unit and support correlation with the Lower Jurassic Hazelton Group and members of the Texas Creek plutonic suite. Age of the fine clastic and bimodal volcanic unit is no older than the youngest detrital zircons (ca. 185 Ma) near its base. That age and the age of a rhyolite unit (176.6 ± 1.1 Ma) at the top support correlation with the Middle Jurassic Salmon River Formation of the Hazelton Group. Resolution of the litho- and chronostratigraphy of the area reveal close similarities in age, rock types, succession, and composition with strata that host the base- and precious metal-rich stratiform Eskay Creek deposit, revealing the potential for Eskay-type volcanogenic massive sulphide (VMS) deposits in the Georgie River area.
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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 | 0.003 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.002 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.009 | 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".