Magmatic Ni-Cu-PGE sulphide deposits at convergent margins
Bibliographic record
Abstract
Magmatic Ni-Cu-PGE sulphide deposits hosted by ultramafic-mafic intrusions in convergent-margin tectonic settings are an increasingly important resource worldwide, yet remain poorly understood and underexplored. A compilation of global mineralized intrusions in subduction-related settings underscores their economic potential and reveals mineralogical differences that may reflect parental magma composition and ore-forming processes. Our geochemical and isotopic investigations of two mineralized ultramafic intrusions in the Cordillera, the orthopyroxene-absent Turnagain Alaskan-type intrusion and the orthopyroxenerich Giant Mascot intrusion, emphasize (1) the importance of wall-rock assimilation in promoting sulphide saturation and formation of an immiscible sulphide liquid; and (2) the ability of narrow conduit systems to channel influxes of new metal-laden magma and serve as traps for the collection of upgraded Ni-Cu-PGE sulphides. Processes fundamental to the production of economic Ni-sulphide deposits in the oxidized and hydrous primitive magmas generated at subduction zones are similar to those that have produced worldclass magmatic nickel deposits in other tectonic settings.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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) | 0.003 | 0.001 |
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; both teacher heads agree on what is shown here.
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".