The age and origin of pseudoachylyte in the Coast Mountains, British Columbia
Bibliographic record
Abstract
Fault-related pseudotachylyte was discovered in the Coast Steep Zone (CSZ), a crustal-scale lineament that extends 1000 km along strike of the Coast Mountains. The pseudotachylyte was found near a NW-dipping near-vertical dextral fault zone in the Prince Rupert area, British Columbia, and contains typical frictional melt textures such as amygdales, spherulites, microlites, flow structures and injection veins. Collectively, the microstructures indicate rapid quenching from a melt, close association with cataclasis, and formation in the upper ~2 km of the crust. Chemical data indicate that the pseudotachylyte matrix is more mafic that the host diorite, and is enriched in biotite and amphibole. Differences in chemical composition between pseudotachylyte and host rock are interpreted to arise from preferential cataclasis and melting of biotite and hornblende due to lower fracture toughness. *’Ar/*’Ar dating of the pseudotachylyte matrix gives a date of 30.51 + 0.7 Ma that is interpreted to be the age of pseudotachylyte generation by seismogenic faulting. The fault that contains pseudotachylyte is related to a set of dextral faults in the CSZ that may have been active at ~30 Ma as right-lateral stress was transferred from the offshore Queen Charlotte transform fault.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".