| 南祁连裕龙沟铜镍硫化物矿床Re-Os同位素物质来源示踪研究 |
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| 引用本文：高永宝,李文渊,张照伟,李超,周利敏,郭周平,张江伟,李侃,钱兵,王亚磊,谭文娟.2012.南祁连裕龙沟铜镍硫化物矿床Re-Os同位素物质来源示踪研究[J].地球学报,33(6):899-906. |
| DOI：10.3975/cagsb.2012.06.08 |
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| 基金项目: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) |
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| 中文摘要: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。 |
| 中文关键词:Re-Os同位素 铜镍硫化物矿床 裕龙沟 化隆 南祁连 |
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| Re-Os Isotopic Analysis of the Yulonggou Cu-Ni Sulfide Deposit in the South Qilian Mountain |
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| Abstract: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 γOs 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. |
| keywords:Re-Os isotope Cu-Ni sulfide deposit Yulonggou Hualong South Qilian Mountain |
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