IGNEOUS ALBITITE DIKES IN OROGENIC LHERZOLITES, WESTERN PYRENEES, FRANCE: A POSSIBLE SOURCE FOR CORUNDUM AND ALKALI FELDSPAR XENOCRYSTS IN BASALTIC TERRANES. I. MINERALOGICAL ASSOCIATIONS
Bibliographic record
Abstract
Dikes of albitite cross-cut two massifs of serpentinized lherzolite in the Pyrenees, France. At Espechere (Hautes-Pyrenees), they are corundum-bearing, whereas at Urdach (Pyrenees-Atlantiques), some dikes contain corundum, others do not. The majority of the minerals described here occur in both types of albitite. Albite is predominant, associated with muscovite and biotite, and with chlorite, epidote, zircon, titanite, thorite, pyrochlore ( s.l. ), aeschynite-(Ce), ferrocolumbite, rutile, ilmenite and magnetite as accessory phases. The epidote shows very high Sr contents (3 to 6 wt%, and up to 8.8 wt% SrO). However, certain minerals seem more specific to one type of dike. In corundum-bearing albitite, ilmenorutile, samarskite ( s.l. ), manganocolumbite, fersmite and fergusonite-(Y) are found, whereas in corundum-free albitite, allanite-(Ce), chevkinite-(Ce), apatite and monazite-(Ce) are developed. There are also subtle differences between corundum-bearing albitites of Urdach and Espechere: the composition of samarskite ( s.l. ) varies from samarskite-(Y) (Urdach) to ishikawaite (Espechere), but the two may be altered to calciosamarskite. Likewise, the composition of pyrochlore ( s.l. ) shows a strong variation, from weakly light-REE-enriched betafite and pyrochlore (Urdach) to Pb-, U-rich pyrochlore ( s.s. ) (Espechere). The textures, dominantly pegmatitic, reflect a rapid magmatic crystallization, large crystals of albite predating the fine-grained carriers of Ca, Sr, Fe, Mg, Zr, Ti, Y, REE, U and Th.
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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 | 0.001 | 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".