Preliminary Paleomagnetic Results from Early Tertiary Plutons of the British Columbia Coast Ranges, Mt. Waddington Area.
Bibliographic record
Abstract
New paleomagnetic results from two early Tertiary granodioritic-to-tonalitic plutons suggest that NE-side-up tilting is not ubiquitous in the Coast Ranges of British Columbia. The study area, located ~350km NNW of Vancouver, extends northeastward across the Coast Ranges from Mt. Waddington. At each of 11 sites we used a gasoline-powered drill to extract 7 one-inch diameter core samples. The orientation of each core was measured using either a sun compass or a magnetic compass. After a preliminary thermal demagnetization experiment, 7 of 11 sites exhibited scattered remanence directions. More careful work is needed to establish the primary paleomagnetic direction of these sites. Four sites yielded consistent directions. Three of these exhibited site-mean directions (two normal; one reverse) close to the expected early Tertiary field direction. The fourth site exhibited a normal polarity remanence that is ~45 degrees clockwise and 15-20 degrees shallow compared to the expected direction. Combined with previous results from Douglas Channel (400 km. to the NW) we see no evidence of widespread NE-side-up tilting within the Coast Ranges of British Columbia. This finding indirectly supports the "Baja BC" hypothesis, which interprets the shallow remanence of older plutons as the result of tectonic transport rather than local tilting.
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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 | 0.000 | 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".