Ore-Forming Environmental Indicator Minerals from the Sullivan Giant Pb-Zn-Ag Ore Deposit, Canada
Bibliographic record
Abstract
Sullivan Pb-Zn-Ag deposit (British Columbia, Canada) is a classic SEDE X-type massive sulfide deposit, which occurs conformably within clastic metased i mentary rocks of the Middle Proterozoic Aldridge Formation. Several typical mine rals from this deposit are studied, including B-rich (tourmaline), Cl-rich (sc apolite and biotite), Ba-rich (feldspar and mica), and Mn-rich (garnet, chlori te, carbonate and ilmenite) minerals. Tourmaline shows a wide variation of chemi cal compositions, from Mg-rich dravite to Fe-rich schorl and Ca-rich uvite. T he δ- 11B values of the tourmalines are from-11.1 to-2.9‰, which is si milar to the range (-15.4 to-1.7‰) found worldwide in tourmalines from mass ive sulfide deposits and tourmalinites in dominantly clastic metasedimentary ter ranes. Multiple stages of tourmaline formation are distinguished in the Sullivan deposit. Cl-rich scapolites occur in the bedded sulfide ores at Sullivan. The scapolite porphyro blasts are more Ca-rich (EqAn= 40.8～50.9) and Cl-poor (X Cl= 0.38～0.54) than t he fine-grained euhedral scapolite crystals (EqAn= 22.4～35.1 and X Cl= 0. 72～0.8 1) in the same sample. Cl-rich biotites are found only in the bedded sulfide or e s with 0.76 to 1.46 wt% Cl and a limited variation of Mg/(Mg+Fe) ratios (0.34～ 0.37). Other biotites are commonly Cl-poor (0.2 wt%Cl) and have a wider range of Mg/(Mg+Fe) ratios (0.24～0.69). Ba-rich feldspar and muscovite with BaO up to 6.8 wt% also occur within the bedded sulfide ores in association with to urmaline, carbonates, and sulfides. Mn-rich garnets (up to 79% end-member spe ss artine) at Sullivan constitute coticules (spessartine-quartz rocks) and spessar t ine-rich tourmalinites; they also disseminated in sulfide ores and other countr y rocks. Other Mn-rich minerals include chlorite (up to 4.7 wt% MnO), carbonate s (up to 30 wt% MnO), and ilmenite (up to 16.7 wt% MnO). It is suggested that th e existences of aforementioned B-, Cl-, Ba-, and Mn-rich minerals at Sulliva n ar e indicative of possible non-marine evaporite involvement in the ore-forming s ys tem and the bedded sulfide ores were likely precipitated in a dense brine pool i n the Proterozoic sea floor at Sullivan.
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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 | 0.003 |
| Science and technology studies | 0.003 | 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) | 0.002 | 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".