Heat flow, heat generation, and crustal temperatures in the northern Canadian Cordillera: Thermal control of tectonics
Bibliographic record
Abstract
The heat flow in the northern Canadian Cordillera between 59 and 64 N is very high, 105 ± 22 mW/m 2 . The average upper crust heat generation is 4.6 ± 2.4 microW/m 3 , giving a reduced deep heat flow of 59 mW/m 2 , similar to the southern Canadian Cordillera, 49–53 N. Estimated Moho temperatures of 800–1000°C and lithosphere only 50–60 km thick are substantiated by slow upper mantle seismic velocities and by high elevations associated with crust only 32–35 km thick. The new data support the conclusion that all of the North and South America Cordilleras are hot. The Paleoproterozoic Wopmay orogen to the east has a remarkably high heat flow of 90 ± 15 mW/m 2 for such an old and stable region. However, basement samples indicate high heat generation and estimated deep temperatures are intermediate between the Cordillera and the Slave Craton further to the east. Heat flow from the Yellowknife area of the Slave Craton, 53 mW/m 2 , implies low lithosphere temperatures in agreement with kimberlite xenolith P‐T data. The high temperatures in the Cordillera result in a very thin and weak lithosphere and may allow a lower crust detachment. The north and central Cordillera have been inland of the coastal Queen Charlotte transform fault since subduction stopped in the Eocene. Thus some process has maintained high temperatures in the former back arc for more than 40 Ma.
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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 | 0.001 |
| 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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 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".