Rhenium-osmium geochronology of gersdorffite and skutterudite-pararammelsbergite links nickel–cobalt mineralization to the opening of the incipient Meliata Ocean (Western Carpathians, Slovakia)
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Bibliographic record
Abstract
Abstract The multi-orogenic crustal segment of the Central Western Carpathians comprises a Variscan basement that is host to small nickel–cobalt (Ni–Co) arsenide and sulfarsenide mineralizations at Ľubietová-Kolba and Čierna Lehota (Slovakia). Here, we constrain the timing of Ni–Co mineralization by using rhenium-osmium (Re–Os) isotope geochemistry of (1) gersdorffite (NiAsS) after krutovite (NiAs 2 ) at Ľubietová-Kolba, and (2) a mixture of skutterudite-pararammelsbergite (CoAs 3 –NiAs 2 ) from the Čierna Lehota deposit, hosted by metamorphosed carbonaceous rocks. Gersdorffite, which is bereft of common Os, returns a Re–Os model age of 238.2 ± 1.0 (2σ) million years (Ma). Four aliquots of the skutterudite-pararammelsbergite mixture define a robust model 1 isochron at 238.2 ± 12.7 (2σ) Ma (mean square weighted deviates – MSDW = 0.95). A crustal source of Os, and by inference other metals, is inferred from the initial 187 Os/ 188 Os ratio of 0.90 ± 0.01 of this isochron. We conclude that studied Ni–Co mineralizations are related to an extensional tectonic regime and hydrothermal fluid flow in connection with the opening of the Meliata ocean in the Middle Triassic (Ladinian).
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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 it