A slab failure origin for the Donegal composite batholith, Ireland as indicated by trace-element geochemistry
Bibliographic record
Abstract
Abstract The Silurian–early Devonian Donegal composite batholith of Ireland is a classic composite batholith that intruded Neoproterozoic Dalradian metasedimentary and metavolcanic rocks during and after the Scandian phase ( c. 435–425 Ma) of the Caledonian Orogeny. The Scandian phase is widely attributed to the collision of Baltica, Ganderia and Avalonia with Laurentia during closure of the Iapetus Ocean. Isotopic and lithogeochemical data indicate episodic construction of the composite batholith from c. 430–400 Ma. The granitoid rocks are enriched in large-ion lithophile elements, such as Cs, Rb and Ba, and are depleted in high field strength (Nb, Ta, P and Ti) and heavy rare-earth elements. In particular, the chemistry of granitoid rocks from the Donegal composite batholith has Nb/Y >0.4, La/Yb >10, Sm/Yb >2.5 and Gd/Yb >2.0. These characteristics are compatible with a slab-failure origin for the batholith. Following collision, the Iapetus Ocean slab severed by detaching from the trailing continental crust. Upwelling asthenosphere filled the void and the advected heat melted the subcontinental lithospheric mantle and/or the base of the crust to generate the magmas that formed the Donegal composite batholith. The trace-element data indicate melt derivation from processes that left behind a garnet-bearing, plagioclase-absent residue.
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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 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 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".