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 (NiAs₂) at Ľubietová-Kolba, and (2) a mixture of skutterudite-pararammelsbergite (CoAs₃–NiAs₂) 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 ¹⁸⁷Os/¹⁸⁸Os 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).

中西部喀尔巴阡山脉的多造山带地壳部分包括一个华力斯坎基底，该基底在 Ľubietová-Kolba 和 Čierna Lehota（斯洛伐克）有小型镍钴 (Ni-Co) 砷化物和硫砷化物矿化。在这里，我们通过使用（1）在 Ľubietová-Kolba 的 krutovite (NiAs ₂ ) 之后的 gersdorffite (NiAsS) 和 (2) 方钴矿的混合物的铼-锇 (Re-Os) 同位素地球化学来限制 Ni-Co 矿化的时间。 -pararammelsbergite (CoAs ₃ –NiAs ₂) 来自 Čierna Lehota 矿床，由变质的碳质岩组成。Gersdorffite 没有常见的 Os，它返回的 Re-Os 模型年龄为 238.2 ± 1.0 (2σ) 百万年 (Ma)。四等份方钴矿-pararammelsbergite 混合物在 238.2 ± 12.7 (2σ) Ma（均方加权偏差 - MSDW = 0.95）处定义了稳健的模型 1 等时线。Os 的地壳来源，以及其他金属的来源，是从这个等时线的 0.90 ± 0.01的初始¹⁸⁷ Os/ ¹⁸⁸ Os 比率推断出来的。我们得出结论，研究的 Ni-Co 矿化与中三叠世（Ladinian）Meliata 海洋的张开相关的伸展构造状态和热液流动有关。