Petrochronologic record of metamorphism and melting in the upper Greater Himalayan sequence, Manaslu–Himal Chuli Himalaya, west-central Nepal
Bibliographic record
Abstract
New in situ U-Th-Pb monazite ages from metapelites within the upper Greater Himalayan sequence in the Manaslu–Himal Chuli Himalaya provide insight into the tectonometamorphic history of this portion of the mountain range. Monazite grains record a protracted evolution characterized by a three-stage growth history at lower structural levels (ca. 30 Ma, ca. 26–21 Ma, and ca. 18–15 Ma) and a single growth stage between ca. 21 and 16 Ma, following complete resorption of earlier monazite at higher structural levels. All specimens record monazite growth during protracted early to middle Miocene melt crystallization, with monazite at higher structural levels significantly overlapping in age with the young phase of the Manaslu pluton. The metamorphic and anatectic ages reported in this study are consistent with a middle Miocene transition from deep hinterland-style deformation characterized by extending flow in the upper Greater Himalayan sequence to shallower foreland-style deformation characterized by compressing flow in the lower Greater Himalayan sequence. This change outlines a deformational continuum between lateral midcrustal flow beneath Tibet and thrust wedge taper deformation along the mountain front as has been put forth in recent thermo-mechanical and conceptual models.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".