Dehydration-induced supralithostatic fluid overpressure in metapelites from Northern Korea
Bibliographic record
Abstract
Orogenic reconstructions typically assume lithostatic pressure, which can be converted into burial depth. Deviations from lithostatic conditions, such as fluid overpressure, are recognized but poorly understood in natural rocks. Here we integrate petrological analysis, radiometric dating, and diffusion chronology to explore the thermal overprinting on metapelites from a Precambrian orogen caused by ca. 110 Ma porphyritic intrusions in Northern Korea. The dissolution-reprecipitation textures of garnet and monazite from the metapelites reveal rapid heating, dehydration, and reworking within ~300 years, reaching 600‒640 °C and 0.75‒0.85 GPa at ca. 110 Ma. The barometric results indicate depths that, if lithostatic, sharply contrast with the shallow emplacement of the contemporaneous porphyries nearby, indicating dehydration-induced supralithostatic fluid overpressure. These findings challenge the lithostatic paradigm and suggest that rapid dehydration and deviation from lithostatic pressures may be more prevalent than previously recognized, with important implications for orogenic reconstructions and seismogenic behaviors at plate boundaries. Rapid dehydration and garnet growth can induce supralithostatic fluid overpressure with important implications for tectonic reconstructions and seismic behaviors, according to thermobarometry and geochronology data from Proterozoic metapelites from Northern Korea.
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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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
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".