Electric Structure of Crust and Upper Mantle Beneath the Bangong‐Nujiang Suture in Tibet from Magnetotelluric Sounding
Bibliographic record
Abstract
Abstract Based on magnetotelluric (MT) sounding along the three profiles across the Bangong‐Nujiang suture in Tibet, we have established the electric model for this tectonic zone and adjacent areas and studied the features of the deep structure in this region. The result shows that there exist widespread discontinuous high‐resistivity bodies in upper crust along this zone and its both sides, which reflect spatial distribution of magmatic rocks that exhibits big difference between the northern and southern sides. Beneath the Gangdisê and Qiangtang terranes, middle and lower crust is characterized by extensive high‐conductivity layers, indicative of the sign of underthrusting of the India continent beneath Tibet. Below the high‐conductivity layers is a high‐resistivity block that emanates from the cold and rigid India crust diving northward. The electric structure model of the Qiangtang terrane can be divided into northern and southern parts. In the southern part, the high‐conductivity layer in crust is related with the impeding of the Bangong‐Nujiang tectonic zone to the underthrusting India plate. While in the northern part of Qiangtang, such zone is associated with the hindering of the Asian continent to the India plate as well as the southward subduction of the Asia continent. Because of the impeding of the Bangong‐Nujiang suture and Asian continent, the northward underthrust of India is likely not over the Bangong‐Nujiang suture, instead sinks into asthenosphere nearby the suture, causing upwelling of mantle materials that resulted in channels for exchanges of heat and materials in crust and mantle as well as large‐scale high‐conductivity bodies that extend downward to upper mantle. The electric structure of the Bangong‐Nujiang suture indicates that it is a set of steep and large faults cutting through the crust.
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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 | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 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".