EXTREME FRACTIONATION AND DEFORMATION OF THE LEUCOGRANITE - PEGMATITE SUITE AT RED CROSS LAKE, MANITOBA, CANADA. IV. MINERALOGY
Bibliographic record
Abstract
Three types of subvertical pegmatitic leucogranites and pegmatites populate the Red Cross Lake pegmatite field, located in a greenstone belt of the Sachigo Subprovince, Manitoba, in the northwestern part of the Archean Superior Province of the Canadian Shield. Most of the leucogranites and pegmatites are geochemically rather primitive, but one of the leucogranites is lithium-enriched, and the most evolved lepidolite-rich pegmatites represent the most fractionated products of granitic differentiation known to date. The lepidolite pegmatites consist mainly of albite, quartz and muscovite to K-, Rb- or Cs-dominant lepidolite, subordinate Rb-rich K-feldspar and spodumene + quartz pseudomorphs after petalite, accessory spessartine, elbaite–rossmanite, beryl, pollucite, fluorapatite, amblygonite, oxide minerals of Ta, Nb, Ti, Sn, Sb and U, and rare zircon, lithiophilite and other phosphates, arsenopyrite, lollingite, stibarsen and bismuth. Along contacts with mafic metavolcanic rocks, a (Ca,Fe,Mg,Ti)- enriched assemblage carries, i.a., K-, Rb- or Cs-based annite to phlogopite dominant over holmquistite, Ca–Mg–Fe-rich tourmaline and garnet, and clinozoisite–epidote. Primary K-feldspar and secondary Rb-dominant feldspar show K/Rb as low as 1.9 and 0.25, respectively. Zoned muscovite-to-lepidolite crystals have K/Rb ≈ 0.09 and K/Cs ≈ 0.02 in the outer Li-rich parts. Spessartine, lithiophilite, elbaite, and (Nb,Ta) oxide minerals are almost devoid of Fe; Nb is locally extremely depleted relative to Ta. Zircon contains ~32.1 wt.% HfO 2 , but wodginite is the main carrier of Zr and Hf. The lepidolite pegmatites underwent extensive shearing leading to mylonitization that did not, however, affect the chemical composition of any minerals except the partially recrystallized and re-equilibrated pollucite.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 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 teacher head, 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".