Conductivity Structure of Crust and Upper Mantle Beneath the Northern Tibetan Plateau: Results of Super‐Wide Band Magnetotelluric Sounding
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Bibliographic record
Abstract
Abstract To study the conductivity structure of crust and upper mantle as well as the thermal regime of lithosphere beneath the northern Tibetan Plateau, the project INDEPTH (III)‐MT completed super‐broadband magnetotelluric (MT) sounding along Dêqên‐Longwei Cuo (line 500) and Nagqu‐Golmud (line 600) in northern and central Tibet in 1998 and 1999. The result shows that the conductivity structure of crust and upper mantle is quite different across the Kunlun Mountains. North to the mountains the crust and upper mantle is relatively highly resistive. South to the mountains, the conductivity structure of crust and upper mantle is of obvious stratification as described following. The upper crust is dominated by discontinuous high‐resistivity bodies with intercalated low‐resistivity anomalies. And the electric structure of the upper crust in NS direction looks like complicated with discontinuous and block‐shaped features. Meanwhile the intermediate and lower crust are characterized by large‐scale high conductivity anomalies, indicated by separated high‐conductivity bodies of big sizes and differing shapes with resistivity less than 4m. Beneath the Bangong‐Nujiang and Jinshajiang River sutures, the high‐conductivity bodies in the crust tend to extend toward the upper mantle, implying existence of a low‐resistivity conduit between crust and mantle. Based on the observed electric structure of crust and mantle beneath the northern and central Tibetan Plateau, we infer that there are extensive partial melt and thermal fluids there like southern Tibet. Their origin is associated with thermal exchange between crust and mantle beneath the Bangong‐Nujiang and Jinshajiang River sutures which occurred in their own conduits. The thermal exchange conduit below the Bangong‐Nujiang River suture was formed earlier than that beneath the Jinshajiang River suture. Therefore the thermal activity of crust and mantle beneath the study area began from south and west, then spread toward north and east, leading to the current heat flow distribution in middle and northern Tibet which becomes larger from west to east and from south to north.
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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) | 0.000 | 0.000 |
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