CHARACTERIZATION OF PARTLY.OPEN-SYSTEM CHEMICAL VARIATIONS IN CLINOPVROXENE AMPHIBOLITE BOUDINS, THREE VALLEY GAP, BRITISH COLUMBIA, USING THOMPSON SPACE CALCULATIONS
Bibliographic record
Abstract
Garnet- clinopyroxene amphibolite boudins crop out near Three Valley Gap, Brirish Columbia. They are as large as 13 m in maximum dimension and occur within metasedimentary gneisses. The metasedimentary rocks contain K-feldspar + sillimanite, and muscovite is not stable. The boudins have assemblages dominated by amphibole (tschermakitic hornblende, tschermakite, mag-nesio-hornblende, some with a rim of secondary ac-linolitic hornblende), unzoned to weakly zoned plagioclase (AAn < 5) in the andesine-bytownite range, and smaller amounts of diopside, quartz and Fe-Ti oxides. Accessory phases include biotite, epidote, enstatite, apatite and garnet. The presence of enstatite in the mineral assemblage indicates peak metamorphic conditions at the boundary between amphibolite and granulite facies. Geobaromeuic-thermometric estimates, based on mineral equilibria, indicate metamorphic conditions near 0.8 GPa and 700oC. A single boudin is chemically heterogeneous on the thin section, hand sample and outcrop scales. The variations in element ratios cannot be explained by original, internal, igneous processes. Plots of the compositions derived from chemical analysis of hand-specimen-size samples and of compositions derived from modal analysis in Thompson space reveal differences in composition similar to those between intermediate igneous rocks (approximately an-desite), tholeiitic basalts and undersaturated basalts, all from a single boudin. These variations are the result of metamorphic or metasomatic processes.
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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".