Mineralogy and petrology of the petalite-subtype Prof pegmatite, Revelstoke, British Columbia, Canada
Bibliographic record
Abstract
Abstract The Prof pegmatite is located NW of Revelstoke, British Columbia, Canada on Boulder Mountain. Due to the abundance of petalite, the pegmatite is classified as a petalite subtype Li-Cs-Ta pegmatite or a Group one pegmatite. The Prof pegmatite contains a suite of minerals indicative of a highly evolved pegmatite melt including petalite, elbaite, lepidolite and Nb–Ta oxides. Four textural zones are present: (1) border; (2) intermediate, including (2.1) graphic texture dominant and (2.2) overgrowth dominant, where diverse minerals form rims around one another; (3) central; and (4) quartz. The border zone has a similar mineralogy to the intermediate zone and is interpreted to represent a chilled margin. The intermediate zone has a feldspar, mica, garnet and dravite–schorl dominant composition. The central zone hosts an evolved pegmatite core, which contains the majority of the lithium mineralisation composed of petalite, elbaite and lepidolite. The tourmaline, Nb–Ta oxides and mica within the pegmatite record the geochemical evolution of the melt from more primitive Fe- and Mg-rich minerals to a Li-, Mn- and Nb-rich assemblage indicative of a highly evolved geochemical system. The various pegmatitic textures and extremely fractionated geochemical composition of the pegmatite indicate that the melt was undercooled and crystallised rapidly. Three phases of metasomatism are recognised in the Prof pegmatite: an albitisation event observed cutting primary orthoclase; followed by a transition to a Na–Li–F-rich event mostly containing secondary albite, trilithionite and elbaites; and a sericitisation event. The Prof pegmatite has a similar mineralogy to known pegmatites at Mount Begbie, 15 km to the south, in particular the notable presence of the rare mineral qitianlingite, petalite, lepidolite and elbaite. Together, these pegmatite bodies form part of an extensive, poorly mapped pegmatite field. Additional work is required to assess the extent and nature of mineralisation within this field.
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".