新疆哈密白石泉铜镍矿区基性—超基性岩的形成时代及其地质意义  

Age of the Baishiqun Mafic-Ultramafic Complex, Hami, Xinjiang and Its Geological Significance

作　　者：吴华[1,2] 李华芹[3] 莫新华[2] 陈富文[3] 路远发[3] 梅玉萍[3] 邓岗[2] 

机构地区：[1]中国地质大学 [2]新疆维吾尔自治区地质矿产勘查开发局第六地质大队,哈密839000 [3]中国地质调查局宜昌地质矿产研究所

出　　处：《地质学报》2005年第4期498-502,共5页Acta Geologica Sinica

基　　金：国家重点基础研究发展规则项目(编号2001CB409810)资助成果。

摘　　要：白石泉铜镍矿床位于中天山地块北缘,沙泉子深大断裂南侧。矿体产于同源同期侵入的中基性—超基性岩体内,其含矿岩石为单辉橄榄岩和斜长橄辉岩。铜镍矿化无论从时间上和空间上都与岩体的侵位密切相关,矿床成因类型为岩浆熔离型铜镍硫化物矿床。锆石SHRIMP微区原位U-Pb年代学研究表明,石英闪长岩的年龄为285±10Ma、辉长闪长岩年龄为284±9Ma和辉长岩年龄为284±8Ma。三者在测定误差范围内十分一致,表明该含矿杂岩体的侵位及矿化作用均发生于晚石炭世末—早二叠世初,成岩成矿的动力学背景为造山期后伸展构造环境。The Baishiquan Cu-Ni deposit is located on the northern margin of the Middle Tianshan Massif and to the south of the Shaquanzi deep-seated fault. Ores distribute in the intermediate-mafic-uhramafic complex of the same source and the same period and usually in clinopyroxene peridotite and plagioclase olivine pyroxenite. Cu-Ni mineralization shows close time-spatial relationship with the mafic-ultramafic complex and formed through magmatic liquation. Zircon SHRIMP U-Pb dating shows that the quartz diorite, gabbro-diorite and gabbro of the orefield has a crystallization age of 285±10Ma, 284±9Ma （95% confidence） and 284±8Ma（95% confidence）, respectively, implying that the intrusion of the complex and related mineralization occurred at the end of the Late Carboniferous and the beginning of the Early Permian and in a post-orogenic extensional dynamic setting.

关 键 词：白石泉铜镍矿 SHRIMP U—Pb年代学 中天山 基性—超基性岩体 超基性岩 铜镍矿 地质意义 形成时代 新疆哈密 

分 类 号：P588.124[天文地球—岩石学] P597.3[天文地球—地质学]