Electrical-resistivity imaging of the central Trans-Hudson orogen
Bibliographic record
Abstract
Magnetotelluric (MT) measurements were made on a profile across the Trans-Hudson orogen in 1992 as part of the Lithoprobe transect. The present study includes analysis of results from a 300 km-long section of the profile in which allocthonous Paleoproterozoic juvenile terranes and arc rocks of the western Trans-Hudson orogen have been juxtaposed against the Archean Sask craton. Impedance tensor decomposition of data from the 40 MT sites in the area indicates a geoelectric strike of N28°E. Two-dimensional inversion of the data using a non-linear conjugate gradient algorithm provided images of the resistivity structure. Resistivity images reveal that the crust of the Sask craton is relatively resistive (>2000 Ω·m). In contrast, the rocks of the Flin Flon belt, Glennie domain, and La Ronge domain are mostly relatively conductive (<1001000 Ω·m). In the east of the study area, the images suggest that the Tabbernor fault juxtaposes more conductive rocks of the Glennie domain in the west against more resistive Archean rocks in the east in the upper 20 km of the crust. In the west of the study area, the images confirm that the North American Central Plains conductor occurs within westward-dipping rocks of the La Ronge domain. The resistivity images also reveal that the lower crust beneath the west of the Glennie domain, within a crustal culmination defined by seismic reflection data, is electrically conductive (<100 Ω·m). An explanation for the enhanced conductivity is that part of the lower crust beneath the western Glennie domain is of Proterozoic age. In this case, a possible source for the enhanced conductivity, based on its location at the edge of the Sask continental block, is Proterozoic ocean margin rocks.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".