摘要
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。
There are lots of intrusive rocks composed of amphibole pyroxenite, gabbro, norite, pyroxenite and augite peridotite in Riyueshan-Hualong basic-ultrabasic rock belt of South Qilian Mountain, which are related to copper-nickel mineralization. The Yulonggou basic complex was formed at （442.4±1.6） Ma. Re and Os concentrations as well as Os and S isotopic analyses were obtained for sulfides in disseminated sulfide ores from the Yulonggou Cu-Ni deposit, with the purpose of assessing the role of crustal contamination in the formation of the Yulonggou Cu-Ni deposit. The initial ^187Os/^188Os ratios are from 0.2239 to 0.2757, the yos values are from 80 to 123, and the δ34S values are from 0.8‰ to 2.4‰; these data suggest that the ore-forming materials were derived from both the mantle and the crust. The content of crust-derived Os is estimated to be 20%-28%. The crustal contamination might have been one of the most important factors for copper and nickel accumulation in the Yulonggou intrusion.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2012年第6期899-906,共8页
Acta Geoscientica Sinica
基金
中国地质调查局地质调查项目(编号:1212011121088
1212011121092
1212011220897和1212010911032)
国家自然科学基金项目(编号:40772062
41102050)
"十一五"国家科技支撑计划项目(编号:2006BAB01A01)联合资助
