THE ORIGIN OF GREISEN FLUIDS OF THE FOLEY'S ZONE, CLEVELAND TIN DEPOSIT, TASMANIA, AUSTRALIA
Bibliographic record
Abstract
The Cleveland deposit, located in northwest Tasmania, Australia, was a major tin-producing mine until its closure in 1986. The deposit is contained by the Cambrian Creek Formation, which comprises argillite, quartz, and lithic wacke, basalt lava flows, pyroclastic deposits, calcareous wacke, arenites, and unfossiliferous limestone. Three styles of mineralization occur in the mine sequence. These are carbonate replacement, greisenization of a quartz porphyry dike, and fissure veins. The area in the mine encompassing the dike and the surrounding vein halo is referred to as Foley’s zone. Five major alteration facies are recognized within the dike with distinct zonation between the types. These include sericitized feldspar greisen, quartz-muscovite greisen, quartz-muscovite-topaz greisen, quartz-topaz greisen and quartz ultragreisen. Oxygen, hydrogen, and sulfur isotope data indicate that the hydrothermal fluids producing the bulk of the mineralization in the Foley’s zone veins show narrow ranges in isotopic compositions. Measured δ D (–65 to –85‰) and calculated δ 18O (7.7–10.3‰) values suggest two possible interpretations. First, the fluids may simply be primary magmatic fluids. Secondly, the fluids may have originated from outside an igneous intrusion and undergone isotopic exchange with a large volume of igneous rock at magmatic temperatures. Sulfur data (1.7–4.1‰) are strongly suggestive of a magmatic origin.
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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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.025 | 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; 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".