The Rice Bay and Northeast Bay Gneiss Domes: a Kinematic Study of Competent Rock Bodies in the Rainy Lake Region of Ontario, Canada
Bibliographic record
Abstract
The Rice Bay and Northeast Bay gneiss domes (RBD and NEBD) are two tonalitic rock units located in the Archean Rainy Lake zone of the Superior Province. The Rainy Lake zone acts as a boundary between two subprovinces, accommodating transpression, significant shortening and dextral motion in its lithologic assemblage. This study contributes to understanding how deformation is partitioned in heterogeneous terranes, and also demonstrates a practical method of kinematic analysis. Foliations, lineations, shear zones, tension gashes, quartz veins, mafic enclaves, and folded and boudined veins were all utilized in the kinematic analysis. Foliation orientations in both domes are consistent with the overall foliation of the region, but the lineation orientations are less steeply plunging than most of the surrounding area. Shear zones in the RBD indicate shortening through sets of sinistral and dextral shears, while in the NEBD only dextral shear zones are observed. Strain analysis of mafic enclaves in the RBD indicate plane strain at lower magnitudes, while folded and boudined veins in the NEBD indicate slightly higher plane strain. Tension gashes related to late stage exhumation exhibit some sense of rotation, indicating that transpression was still occurring during the final stages of deformation. Models of triclinic transpression with oblique simple shear and extrusion directions were fit to the lineation and strain data observed in both units. The shear obliquity angle is similar for both units (approximately 20° E) and the angle of extrusion is subvertical for both. The kinematic vorticity estimates differ between the two units indicating that the bulk rock in the RBD was accommodating mostly dextral shear whereas the bulk rock in the NEBD was accommodating mostly shortening. The set of triclinic models previously determined for the rest of the Rainy Lake area are similar, but the amount of partitioning between pure shear and simple shear and the extrusion angle differ in other rock units.
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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 | 0.004 |
| Science and technology studies | 0.003 | 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".