High-pressure, low-temperature metamorphism preserved in the Indus-Yarlung suture zone of the eastern Himalaya: Overprinting at amphibolite facies and comparison with occurrences in the western Himalaya
Bibliographic record
Abstract
Abstract Eclogite and blueschist are important monitors of subduction zone processes and can record complex polymetamorphic histories during the protracted evolution of subduction systems. However, the rarity of such high-pressure, low-temperature metamorphic rocks in the Indus-Yarlung suture zone of the Himalaya hinders our understanding of the convergence of India and Asia. Here, we examine high-pressure, low-temperature metamorphic rocks from the Milin area of the eastern Indus-Yarlung suture zone. A comprehensive microtextural, mineral chemistry, and phase-equilibrium modeling investigation shows that low-temperature eclogite-facies metapelites with different parageneses (garnet-mica schists) experienced a cold subduction history along a low-thermal gradient, with peak pressures of ~1.6 GPa at ~550 °C. This represents an approximate thermal gradient of ~10 °C km−1. After peak pressure, these rocks underwent a two-step exhumation history with initial exhumation accompanying heating at ~590–600 °C and ~0.8–1.0 Gpa; this was followed by the second stage of exhumation to lower amphibolite-facies conditions. We interpret these low-temperature eclogite-facies metapelites to represent sedimentary rocks that overlaid Neo-Tethyan oceanic crust during subduction. Exhumation paths of high-pressure, low-temperature rocks in the eastern Indus-Yarlung suture zone include an amphibolite-facies overprint, which is absent from high-pressure, low-temperature rocks in the western Indus-Yarlung suture zone. This result is caused by the different timing of exhumation relative to the terminal collision of India and Asia.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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".