Formation, reactivation and exhumation of the extruded basement wedge in the southern Longmen Shan, eastern Tibetan plateau
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
The Longmen Shan (LMS) fold-and-thrust belt in the eastern Tibetan plateau marks the boundary between the Songpan–Ganze terrane and the Sichuan basin. Deformation mechanisms and the mountain building process in the LMS remain unclear. Here we conducted field mapping, structural analysis, 40 Ar/ 39 Ar geochronology of biotite, and re-interpretation of the Wenchuan Earthquake Fault Scientific Drilling borehole data and a seismic reflection profile across the LMS. Our results indicate that a gently dipping LMS extruded wedge overlies the reactivated Yangtze craton. This wedge consists of several rigid Neoproterozoic complexes, bounded by the NW-dipping LMS detachment above and the Yingxiu–Beichuan thrust below. The Yingxiu–Beichuan thrust extends northwestwards to a depth of c. 8 km beneath the Songpan–Ganze terrane. Coeval activation of the top-to-the-NW LMS detachment and the top-to-the-SE Yingxiu–Beichuan thrust in the Early Cretaceous resulted in the extrusion of the LMS wedge from a depth of 10–15 km. The wedge rapidly exhumed through imbricated thrusting along low-strength series since 40–30 Ma. This Cretaceous basement wedge extrusion bridges the time gap between the Late Triassic–Early Jurassic crustal shortening and the Cenozoic rapid exhumation in the LMS, representing a transformation from north–south compression in the Late Triassic–Early Jurassic to east–west compression in the Cenozoic.
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.
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 | 0.001 | 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 |
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 it