Are silicate‐rich inclusions in spodumene crystallized aliquots of boundary layer melt?
Bibliographic record
Abstract
Abstract The constitutional zone refining model for the internal crystallization of granitic pegmatites stipulates that a highly fluxed and incompatible element‐enriched boundary layer melt evolves at the surface of crystal growth fronts in undercooled granitic melts. It has been argued that silicate‐rich inclusions in primary spodumene and petalite from the T anco pegmatite are the crystallized products of an entrapped boundary layer melt. However, inclusions of identical character and composition to those in primary spodumene are also abundant in the spodumene component of SQI (spodumene + quartz intergrowths) that formed by the isochemical breakdown of petalite. Both textural types of spodumene at T anco host fluid inclusion assemblages that display highly variable proportions of solid phases (dominantly cookeite, quartz, and zabuyelite) and a low salinity (approximately 6 wt% NaCl equivalent) aqueous fluid. The average major element content of three fluid inclusion assemblages is approximately Li 2 O (3 wt%), Al 2 O 3 (11 wt%), SiO 2 (30 wt%), CO 2 (3 wt%) and H 2 O (53 wt%). The entrapment of these fluid inclusions is temporally and spatially unrelated to the flux‐rich melt that may have developed at the primary crystallization front of the pegmatite. Petrographic evidence and the mineralogical and chemical composition of spodumene‐hosted inclusions suggest that inclusions in spodumene are the products of hydrothermal dissolution of the host and the precipitation of quartz, cookeite, and zabuyelite prior to and during necking.
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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 | 0.000 |
| Science and technology studies | 0.000 | 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".