Structural style and timing of deformation on the Bathurst Fault (eastern Slave Craton): implications for basement fault-controlled fluid pathways
Bibliographic record
Abstract
Crustal-scale basement faults persist as long-lived structures that localize deformation and enhance crustal permeability. The left-lateral Bathurst Fault in the eastern Slave craton intersects the 1.7 Ga Thelon Basin where unconformity uranium deposits are spatially associated with basement faults. Field observations, structural data, and U-(Th)-Pb and 40Ar/39Ar geochronological analyses are applied to characterize deformation on the Bathurst Fault in order to assess its potential as a conduit for uranium mineralization in the Thelon Basin. Highly-strained hornblende monzodiorite to granodiorite rocks are predominant along the Bathurst Fault, with quartz and feldspar microstructures showing deformation conditions above 500°C. Brittle fractures, cataclasis, and hydrothermal alteration overprint the ductile fabric in rocks adjacent to the fault trace. U-Th-Pb dates from syn-kinematic monazite suggest ductile shearing at ca. 1933 Ma and 1895 Ma, whereas zircon from a cross-cutting dyke constrains the onset of brittle deformation to ? 1839 ± 14 Ma. 40Ar/39Ar dates from fabric-defining minerals yield cooling ages of ca. 1900 Ma to 1850 Ma for hornblende and muscovite, and a maximum cooling age of ca. 1840 Ma for biotite. We interpret brittle deformation, occurring at or after ca. 1840 Ma, to have localized along an older, ca. 1935-1895 Ma, ductile high strain zone along the north-northwest trending Bathurst Fault trace. The timing of brittle faulting and heavy alteration of primary host rock minerals, including disturbed U-Th-Pb systematics in monazite, support the inference that the Bathurst Fault behaved as permeable basement structure with the capacity to channel fluids into the adjacent Thelon Basin.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".