Merenskyite and Other Precious Metal Minerals In Sulfide Blebs From the Rudniy Ultramafic-Mafic Intrusion, Northwest Mongolia
Bibliographic record
Abstract
Abstract The compositions of PGE and precious metal minerals located in sulfide blebs from the base of the melagabbro unit of the Rudniy ultramafic-mafic intrusion in northwest Mongolia were studied. Sulfide blebs occur in the elongated narrow zone (∼30 × 0.2 m), which extends along the contact with the leucogabbro. There are two layers in this zone, the upper (present throughout the zone) and the lower (present fragmentarily). The layers differ in bleb shape, size, and distribution. The layers also have different types of olivine crystals and PGE mineral abundances, but exhibit nearly identical whole-rock metal contents. Approximately 240 grains of PGE and precious metal minerals were studied, and at least eight different minerals were identified. Melonite group minerals (PtTe 2 –PdTe 2 –NiTe 2 ) dominate the majority of the single and composite grains in blebs from both layers. A correlation exists between the melonite group mineral compositions based on the host mineral and bleb layer. No other PGE minerals were identified in the lower layer. Three Ag phases, hessite (Ag 2 Te), sopcheite (Ag 4 Pd 3 Te 4 ), and telargpalite [(Pd,Ag) 3 Te], and three Sn phases, paolovite (Pd 2 Sn), taimyrite [(Pd,Cu,Pt) 3 Sn], and an unnamed Pt stannotelluride mineral (probably Pt 3 SnTe 4 ), were identified with hessite in the composite grains of the upper layer. A comparison of compositional data obtained from the melonite group and data from other occurrences indicates an uncommonly wide range of compositions, most likely indicating supercooling conditions during crystallization.
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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 | 0.000 | 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) | 0.000 | 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".