Ore Assemblages, Platinum-Group Minerals, and Behavior of Cl in Low-Sulfide Zones, Vologochan—Pyasinskiy Suites, Norilsk Complex, Russia
Bibliographic record
Abstract
Abstract Ore assemblages in zones of low-sulfide mineralization of the Vologochan−Pyasinskiy intrusion of the Norilsk complex have multicomponent compositions involving Pd, Pd-Pt-(Rh, Ir), Au-Ag, REE, Y, Zr, Th, and U. They were deposited at late stages of crystallization of the ore-bearing zones in the presence of abundant volatile components, especially Cl, which accumulated late in the fluid-saturated medium. Evolutionary trends in the ore zones are documented in the compositions of olivine, orthopyroxene, clinopyroxene, plagioclase, spinel-group minerals, calcic amphiboles, apatite, micas, and pentlandite, among other species. We find (1) examples of monomineralic inclusions of clinopyroxene and plagioclase trapped in a globule of oxide melt, (2) evidence of the possible existence of a melt of anhydrite composition, and (3) aggregates of magnetite deposited along the periphery of grains of hercynite–spinel solid solution. A progressive buildup in Cl is reflected in patterns of compositional zonation in apatite, calcic amphibole, and annitic mica; levels of Cl consistently increase outward. Very efficient differentiation proceeded under oxidizing conditions in the mineralized zones of the Vologochan−Pyasinskiy intrusion. We provide complementary mineralogical data for sulfide-poor ore zones in the western flank of the Oktyabrsky deposit. Our inferences lead to a better understanding of ore genesis and evolution of low-sulfide ore-forming environments associated with the Siberian Traps.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 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 | 0.001 |
| 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".