Magmatic Records of Subduction Initiation and Early Building of the Kohistan Island Arc, Pakistan
Bibliographic record
Abstract
ABSTRACT Subduction zones play a crucial role in Earth's physical and chemical dynamics, but their initiation and related magmatism remain poorly understood. This study presents new zircon U–Pb age, Hf–O isotope and whole‐rock major–trace element and Sr–Nd isotope data from the Kohistan arc in northern Pakistan, a well‐preserved Phanerozoic oceanic crustal arc. The Jaglot Group basalts are low‐K tholeiites similar to early Izu–Bonin–Mariana forearc basalts, representing the oldest volcanic stratigraphy of the Kohistan arc. The Matum Das tonalite, intruding the Jaglot Group at ~155 Ma, provides a new minimum age for subduction initiation. The rapid formation of new felsic crust shortly after subduction initiation challenges existing models and indicates the need for further research into early arc‐forming processes.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.002 | 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".