Burial, Accretion, and Exhumation of the Metamorphic Sole of the Oman‐UAE Ophiolite
Bibliographic record
Abstract
Abstract We conducted petrological analyses of samples collected across a 250‐m thick section of the metamorphic sole of Oman‐United Arab Emirates ophiolite. Thermobarometric calculations on garnet‐clinopyroxene amphibolites (retrogressed granulites) from the top 85 m of sole indicate peak pressure‐temperature conditions of 700°–900°C and 10–12 kbar, corresponding to depths of 30–40 km. Structurally lower (85–250 m below peridotite) epidote amphibolites record similar pressures, but temperatures that are ∼100°C lower. We document progressive retrogression of the peak granulite facies assemblage down through amphibolite and greenschist facies pressure‐temperature conditions. We propose that pervasive granulite formation in metabasic rocks along the top of the downgoing slab resulted in rheological strengthening that caused the subduction interface to migrate downwards and accrete a slice (the high‐temperature sole) to the hanging‐wall mantle. Structurally lower thrust slices of epidote and bimineralic amphibolites, as well as interlayered metasedimentary rocks, were subsequently underplated at similar pressures of 10–12 kbar, but lower temperatures, as the subduction zone cooled. Prograde metamorphism of these lower‐grade thrust slices released fluids that (re)hydrated the overlying granulites and hanging‐wall peridotites. Along with several other recent studies, our results indicate that the base of the ophiolite and the granulite‐amphibolite facies part of the metamorphic sole were juxtaposed at depths of 30–40 km. Our results are consistent with other observations from the metamorphic sole and base of the ophiolite that indicate the sole was exhumed along a flattening slab.
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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 | 0.001 | 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 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".