Southwestern Tian Shan: 2. Timing of Cenozoic Mountain Building, Intra‐Montane Basin Inversion, and Relation to Lithospheric Mantle Indentation
Bibliographic record
Abstract
Abstract Cenozoic reactivation of the Paleozoic thick‐skinned fold‐thrust belt of the southwestern Tian Shan has—as the Afghan‐Tajik Basin inversion—been interpreted to be driven by Indian mantle‐lithosphere indentation beneath the Pamir. Herein, we date the reactivation and explore its temporal and spatial variations. Three structural domains emerged. In the Central Domain (Zeravshan‐Gissar, Vashan), apatite fission‐track (AFT) data—aided by Raman‐spectroscopic chemical‐composition discrimination of detrital apatites and vitrinite‐reflectance paleotemperature estimates—record a 15–10 Ma onset of shortening and >4 km exhumation. The Northern Domain, with the southerly bounding N‐Zeravshan Fault as the major Cenozoic structural divide reactivating the Paleozoic Zirabulak Suture, exhumed from <4 km. Apatite (U‐Th)/He (AHe) ages suggest a similar reactivation history as in the Central Domain. The synchronous structural reactivation implies rapid shortening propagation from the Pamir across the Afghan‐Tajik fold‐thrust belt into the southwestern Tian Shan. In the Southern Domain (Paleozoic Gissar Batholith), 9–7 Ma AFT and ∼4 Ma AHe ages suggest southward shortening propagation from both northern Domains and anew fault formation. In the hanging walls of major thrusts, 7–3 Ma AFT ages record significant and/or long‐lasting exhumation. Zircon (U‐Th)/He data limit exhumation to <6 km. Most of the Southern and Central Domains cooled monotonously but temperature‐time models indicate northward‐decreasing reheating by syn‐orogenic deposition, consistent with stratigraphic data. The refined timing supports the synchroneity between major Cenozoic Tian‐Shan mountain building and India mantle‐lithosphere indentation beneath the Pamir and western Tibet, and the instantaneous transfer of shortening across a >500‐km‐wide foreland, facilitated by structural reactivation.
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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) | 0.002 | 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".