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南祁连日月山—化隆基性-超基性岩带发育多个与铜镍矿化有关的岩体,岩石类型主要有角闪辉石岩、辉长岩、苏长岩、辉石岩、辉橄岩等,其中裕龙沟基性杂岩体形成于(442.4±1.6)Ma。通过对裕龙沟铜镍矿床稀疏浸染状矿石中硫化物的Re-Os及S同位素物质来源示踪研究,其187Os/188Os初始比值为0.2239～0.2757,γOs为80～123,δ34S为0.8‰～2.4‰,表明其物质来源具有壳-幔混合特征,壳源Os的加入量为20%～28%,地壳物质的加入可能是裕龙沟岩体富集成矿的重要因素。
A number of rock masses related to copper-nickel mineralization are developed in the Riyamiyama-Hualong basic-ultrabasic rock belt of the southern Qilian. The rock types are mainly hornblende, gabbro, tectorite, pyroxenite, Rock, etc., where the Yulongou basic complex body is formed at (442.4 ± 1.6) Ma. By tracing Re-Os and S isotopes of sulfide in sparsely disseminated ores from Yulonggou copper-nickel deposit, the initial ratios of 187Os / 188Os are 0.2239 ~ 0.2757, γOs are 80 ~ 123, and δ34S is 0.8 ‰ ~ 2.4 ‰, indicating that the source rocks have the characteristics of crust-mantle mixing. The addition of crustal source Os is 20% -28%. The addition of crustal material may be an important factor for the enrichment mineralization of Yulongou pluton.