Middle Eocene‐Oligocene anatexis and exhumation of the Greater Himalayan Sequence in central Nepal
Bibliographic record
Abstract
Abstract We present structural analysis and zircon and monazite geochronology of the Greater Himalayan Sequence (GHS) in the Kali Gandaki valley, central Nepal. Although the foliation is moderately NE‐dipping, the upper GHS shows a top‐to‐WNW shear sense, whereas the lower GHS developed top‐to‐SW ductile shear zones. Quartz fabrics from mylonitic gneisses indicate deformation temperature from >650°C to ~450°C. Monazite from the GHS recorded anatexis at “near peak” conditions from ~43 to 28 Ma and exhumation near the sillimanite‐kyanite transition at 25–21 Ma. Ages of zircon rims constrain the onset of exhumation. From the upper GHS to the Main Central Thrust zone, pervasive deformation and anticlockwise rotation of the lineation from the orogen‐parallel to orogen‐perpendicular direction suggest exhumation of the GHS by general shear from ~31 to 21 Ma. A two‐stage exhumation model is proposed to explain the diffuse strain distribution and anatexis during early crustal thickening.
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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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.011 | 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".