In situ SHRIMP U-Pb geochronology of Barrovian facies-series metasedimentary rocks in the Happy lake and Josephine River supracustal belts: implications for the Paleoproterozoic architecture of the northern Hearne domain, Nunavut; Radiogenic Age and Isotopic Studies: Report15
Bibliographic record
Abstract
Sensitive high-resolution ion microprobe (SHRIMP) U-Pb dates on in situ monazite grains areinterpreted to yield an age of 1886 " 6 Ma for the approximately 6 kbar metamorphism and associated S2shortening within kyanite-bearing metapelitic rocks of the Josephine River supracrustal belt. These datademonstrate that mid-crustal shortening accompanied ca. 1.9 Ga, greater than 10 kbar metamorphism previously documented in the adjacent northwestern Hearne domain. In situ SHRIMP U-Pb monazite ages for kyanite-bearing metasedimentary rocks near Happy lake,metamorphosed at approximately 6 kbar, form a single 1835 " 11 Ma population. An apparent correlationbetween monazite ages and textural locations, however, is interpreted to yield 1850 " 18 Ma for the age ofBarrovian metamorphism and associated S1 or S2 fabric (textural ambiguity remains), and 1826 " 15 Ma for theage of S3 staurolite. It is suggested here that the greater than 1850 Ma, S1 fabric is associated with a regionallyimportant shear zone that carried the central Hearne domain northward over the northwestern Hearne domain.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".