A multidisciplinary investigation of multiple remagnetizations within the Southern Canadian Cordillera, SW Alberta and SE British Columbia
Bibliographic record
Abstract
Abstract An integrated palaeomagnetic, geochemical and petrographic study was conducted on two folds in the Front Range of the Southern Canadian Cordillera in order to better understand the timing and origin of chemical remanent magnetizations (CRMs) relative to orogenesis. The folds are contained within Mississippian carbonates (330–335 Ma) which contain a pervasive pre-tilting to early syn-tilting Early Cretaceous, high-temperature CRM residing in magnetite. An intermediate-temperature CRM is a late syn-tilting to post-tilting, possibly Tertiary remagnetization, residing in pyrrhotite. A fluid conduit test (FCT) conducted on bedding-parallel veins shows that they are associated with the magnetite CRM, whereas late-stage tensile veins show a relationship to a pyrrhotite CRM. Elevated 87 Sr / 86 Sr data indicate alteration by fluids with a radiogenic signature; along with the FCT results, these data are consistent with the interpretation that the magnetite CRM formed as a result of hydrocarbons and/or evolved basinal fluids that migrated ahead of the deformation front. Based on the presence of sulphur-enriched bitumen, barite and sphalerite, common by-products of thermal sulphate reduction (TSR), the pyrrhotite CRM is interpreted to be the result of late-stage TSR caused by warm basement fluids which moved along faults and fractures.
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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 | 0.004 | 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) | 0.002 | 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 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".