TECTONOMETAMORPHISM AT ca. 2.35 AND 1.85 Ga IN THE RAE DOMAIN, WESTERN CHURCHILL PROVINCE, NUNAVUT, CANADA: INSIGHTS FROM STRUCTURAL, METAMORPHIC AND IN SITU GEOCHRONOLOGICAL ANALYSIS OF THE SOUTHWESTERN
Bibliographic record
Abstract
New constraints on the Paleoproterozoic evolution of the Rae domain, western Churchill Province, Nunavut, are provided through a linked structural, metamorphic, and in situ geochronological investigation of the southwestern part of the Archean Committee Bay belt. Within D2 strain shadows proximal to a ca. 2.72 Ga synvolcanic pluton, S1 is recognized as a northward-striking, east-dipping foliation associated with west-vergent D1 folds and possible thrusts. The D1 structures are variably over-printed by a northeast-striking, southeast-dipping S2 foliation associated with shallowly northeast-plunging, northwest-vergent F2 folds. Whereas some textural observations suggest a cryptic, pre-D1 thermal event that may be related to widespread ca. 2.61– 2.58 Ga granitic plutonism, porphyroblast–fabric relationships in metapelitic rocks demonstrate that two main metamorphic events occurred, syn- to post-D1 (M1) and syn- to post-D2 (M2). Thermobarometric data and quantitative phase diagrams indicate relatively low-P, clockwise P–T–t paths culminating in post-tectonic growth of andalusite during both M1 and M2. Monazite inclusions in late- to post-D1 garnet and staurolite yield a 2344 – 6 Ma age population that, on the basis of microtextural features, effectively dates M1 metamorphism at a late stage of D1 strain. Monazite growth occurred between 520 and 560C. Event M2 is dated by matrix monazite that forms a 1838 – 5 Ma age population. The absence of magmatic rocks of appropriate age that could provide heat, together with clockwise P–T–t paths and porphyroblast growth at a late stage of both D1 and D2 contractional strain events, collectively point to metamorphism as a consequence of crustal shortening and thickening. The compressional forces that
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.002 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".