| 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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| 关键词:Re-Os isotope Cu-Ni sulfide deposit Yulonggou Hualong South Qilian Mountain |
| 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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| Re-Os Isotopic Analysis of the Yulonggou Cu-Ni Sulfide Deposit in the South Qilian Mountain |
| 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. |
| GAO Yong-bao,LI Wen-yuan,ZHANG Zhao-wei,LI Chao,ZHOU Li-min,GUO Zhou-ping,ZHANG Jiang-wei,LI Kan,QIAN Bing,WANG Ya-lei,TAN Wen-juan.2012.Re-Os Isotopic Analysis of the Yulonggou Cu-Ni Sulfide Deposit in the South Qilian Mountain[J].Acta Geoscientica Sinica,33(6):899-906. |
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