Magnetotelluric constraints on the Late Mesozoic rifting and magmatism in Southeast China
Bibliographic record
Abstract
Summary The Late Mesozoic Southeast China is characterized by widespread rifting and magmatism. Previous studies have suggested an extensional setting as the Southeast China basin and range system generated under the Paleo-Pacific tectonic regime. In order to better understand the tectonic evolution as well as the driving force of rifting and magmatism, two-dimensional (2-D) resistivity models were derived from three broadband magnetotelluric (MT) profiles collected in the southern part of Cathaysia block. The Wuyi-Yunkai orogen is manifested as high resistivity of over 1000 Ωm, while low resistivities of less than 100 Ωm breach the lower crust and upper mantle in the Ganjiang fault zone and Zhenghe-Dapu fault zone. The elevated uppermantle conductivities were investigated by calculation of hydrogen ion (H+) content and melt fraction using mantle geotherm and properties of olivine based on laboratory studies. We propose that the hydration of mantle wedge and release of fluids and volatiles during the subduction of Paleo-Pacific plate led to an increment in pore fluid pressure and reactivated the Ganjiang fault zone and Zhenghe-Dapu fault zone, therefore, accelerated the NW-SE extension and the formation of NE trending faults and rift basins. These faults acted as mechanically weak zones and provided pathways for deep fluids. The ongoing extension and rifting caused progressively thinning of the lithosphere which facilitated the upwelling of asthenosphere and triggered excessive intracontinental magmatism.
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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 | 0.001 | 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) | 0.000 | 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".