Exhumation and uplift of the Shillong plateau and its influence on the eastern Himalayas: New constraints from apatite and zircon (U‐Th‐[Sm])/He and apatite fission track analyses
Why this work is in the frame
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Bibliographic record
Abstract
The Shillong plateau is the only raised topography in the foreland of the Himalayas. Located on the trajectory of the Indian Summer Monsoon (ISM), the plateau perturbs the regional distribution of precipitation. As such, the Shillong plateau‐eastern Himalaya‐ISM is a unique system to quantify the couplings between climate, tectonics, and erosion. A change in long‐term erosion rates along‐strike of the Bhutan Himalaya was recently attributed to a climatic modulation due to the uplift of the Shillong plateau. To test this interpretation, it is essential to constrain the timing and rate at which the plateau was uplifted and the amount of partitioning of the India‐Asia convergence into the plateau. We used apatite and zircon (U‐Th‐[Sm])/He and apatite fission track analyses to unravel the thermal histories of 13 basement samples collected along a N‐S transect across the central Shillong plateau. We find that (1) the exhumation of the plateau began at least 9–15 Ma ago, (2) its surface uplift was chronologically decoupled from its exhumation and started after ∼3–4 Ma at rates of 0.4–0.53 mm/a, (3) the long‐term horizontal shortening rate accommodated by the plateau is 0.65–2.3 mm/a, which represents only 10–15% of the India‐Asia convergence rate. The uplift of the Shillong plateau did not significantly modify the rock uplift rate in the Bhutan Himalaya, which is consistent with the hypothesis of climatic modulation of the Pliocene erosion, tectonic, and landscape evolution previously documented along this orogenic front.
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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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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