OXIDE MINERALS OF THE SEPARATION RAPIDS RARE-ELEMENT GRANITIC PEGMATITE GROUB NORTHWESTERN ONTARIO
Bibliographic record
Abstract
The newly discovered Separation Rapids pegmatite group, situated in mafic metavolcanic host-rocks that represent the eastern extremiry of the Bird River metavolcanic- metasedimentary belt, contains Ontario's first occurrences of wodginite-group minglals (mainly wodginite and ferrowodginite), the pyrochlore-group minerals stibiomicrolite, stibiobetafite and ynropyrochlore, fenotapiolite, and probably the first occurrence in North America of nigerite from a granitic pegmatite. This example of the rare-element class of granitic pegmatites hosts both beryl- and petalite-subtype pegmatites. Columbite-tantalite and cassiterite are the predominant oxide species. On the basis of columbite-tantalite compositions, the pegmatites have been divided into an Fe-suite and a Mn-suite. Both beryl and petalite pegmatites occur in each suite. On the basis of ferrocolumbite compositions, the associated Separation Rapids pluton is considered to be the parent of at least the Fe-suite ofpegmatites. The Fe suite includes beryl pegmatites within and adjacent to the pluton, in which ferrocolumbite coexists with ferrowodginite, and, with increasing evolution, petalite-bearing pegmatites that contain ferrotantalite and wodginite. In individual pegmatites, columbite-tantalite variation is mainly in Tal(Ta + Nb). Minor microlite, antimonian microlite and stibiomicrolite are found replacing earlier phases. Cassiterite is the final M-Ta-bearing oxide to crystallize. Pegmatites belonging to the Mn-suite follow a similar pattern of crystallization, with early manganocolunbite followed by manganotantalite, the latter coexisting with wodginite. Manganocolumbite within individual samples varies appreciably in Mn/(Mn + Fe), whereas the variation in manganotantalite is mainly in Tal(Ta + Nb). In pods rich in "cleavelandite " and
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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 | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".