学术
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
吴华[1,3] 李华芹[2] 莫新华[3] 陈富文[2] 路远发[2] 梅玉萍[2] 邓岗[3]
[1]中国地质大学,北京100083 [2]中国地质调查局宜昌地质矿产研究所,443003 [3]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
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。[著者文摘]
文章出处:
《地质学报》-2005年79卷4期 -498-502页
Age of the Baishiqun Mafic-Ultramafic Complex, Hami, Xinjiang and Its Geological Significance
Wu Hua;Li HuaQin;Mo XinHua;Chen FuWen;Lu YuanFa;Mei YuPing;Deng Gang
Abstract:
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.
Key words:
Baishiquan Cu-Ni deposit; SHRIMP U-Pb ages; Middle Tianshan Mt. ; mafic-ultramafic complex
基金资助:
本文为国家重点基础研究发展规则项目（编号2001CB409810）资助成果.
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