THE ROLE OF COOLING RATE ON THE Al Si ORDER OF K-FELDSPAR IN THE HERCYNIAN TABUA GRANITE, CENTRAL PORTUGAL
Bibliographic record
Abstract
An assessment of the influence of the cooling rate in the Al–Si order of K-feldspar of the Hercynian Tábua porphyritic biotite granite, in central Portugal, is presented, taking into account the results of a numerical cooling model. As estimated from cell-parameter data, ca. 92 % Al is located in T1 sites of the K-feldspar throughout the whole pluton, except in a 1.5-km-wide margin, where this occupancy rapidly decreases to ca. 79 % close to the contact. Although below ca. 500°C, cooling rate was fairly uniform over the entire pluton, in the range 650–500°C it was, on average, 2°C/ka in the margin and 0.6°C/ka in the interior. Cooling rate of the pluton and degree of order of K-feldspar are highly correlated. In our opinion, cooling rate was the determin-ing factor in establishing the Al–Si order of K-feldspar over most of the pluton. However, some observations point to reversal of the effect of cooling rate near the contact, in areas of pegmatite-bearing granite, where a fluid phase presumably had a major role.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 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".