Reinterpretation of the geodynamic evolution and multistage mineralization events of the Nifty copper deposit, Paterson Province, Western Australia through age, textural and geochemical data
Bibliographic record
Abstract
The structurally-controlled Nifty copper deposit in Western Australia is more complex than previously recognised. The earliest sulfide mineralisation represented by pre-ore, framboidal and atoll/sunflower-shaped pyrite is overgrown and replaced by Stage 1 sphalerite, galena, pyrite and chalcopyrite that has characteristics of Clastic-Dominated type Zn-Pb mineralisation. Stage 2 mineralisation is represented by stratiform and disseminated chalcopyrite associated with phengite-chlorite ± dolomite assemblages. Stage 2 mineralisation formed at 278 ± 25 °C before being silicified then cross-cut by Stage 3, structurally controlled, massive, vein and breccia chalcopyrite, pyrite, quartz, dolomite, siderite, and other minor minerals, which formed between 271 ± 44 °C and 295 ± 15 °C. Historic geochronological data combined with new observations reveal that Stage 1 mineralisation formed between 840 Ma and 810 Ma whereas Stage 2 mineralisation may have formed as early as 717 ± 5 Ma. New Re-Os ages of 673.9 ± 3.3 Ma and 664.8 ± 1.7 Ma from Stage 3 pyrite correspond to previously reported U-Pb ages of 675 ± 21 Ma, 665 ± 9 Ma and 648 ± 12 Ma obtained from monazite and apatite extracted from quartz-chalcopyrite veinlets, and overlap with a U–Pb age of 678 ± 12 Ma from titanite in a biotite monzogranite, and the earliest stages of the intrusion of the O’Callaghans Supersuite intrusions. A Rb-Sr age of 619 ± 14 Ma from biotite in a chalcopyrite-quartz vein represents the last stage of copper mineralisation. Whole rock geochemical data and LA-ICPMS analysis support petrographic findings and is used to distinguish the different stages of mineralisation. Importantly, Stage 3 mineralisation records highly anomalous concentrations of both U and Sn, indicating that copper mineralisation involved mixing of an oxidised and a reduced fluid during the mineralisation processes. The ilmenite-stable granites of the O’Callaghans Supersuite are a possible source for Sn at Nifty, but more work is required to substantiate this hypothesis.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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 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".