矿床地质2017，Vol.36Issue(5)：1185-1196,12.DOI:10.16111/j.0258-7106.2017.05.009
东昆仑夏日哈木铜镍矿床Ⅱ号岩体年代学、地球化学及其意义
Zircon SHRIMP U-Pb geochronology, geochemistry and implications of No.Ⅱ intrusion in Xiarihamu Cu-Ni deposit, East Kunlun Mountains
摘要
Abstract
The Xiarihamu super large nickel deposit is located in the island arc zone in the middle part of the western segment of the East Kunlun orogenic belt.The No.Ⅱ intrusion is mainly composed of gabbro and pyroxenite with mineralization such as limonite,pyrrhotite,pentlandite and chalcopyrite.Major element values of Xiarihamu No.Ⅱ intrusion show sub-alkalic series and are characterized by low SiO2 content (48.12％～50.18％)and low TiO2 content (0.47％ ～0.73％),but high MgO content (13.15％ ～19.59％).The m/f ratios of the rocks range from 3.14 to 3.88,falling into the range of ferrous-ultramafic rocks.LREE-rich trace elements patterns are enriched in LILE and relatively depleted in HFSE (Nb,Ta,Ti).Zircon SHRIMP U-Pb dating of gabbro yielded (424.1 ± 4.6) Ma,suggesting it formed in Silurian.In this paper,the geological characteristics between Xiarihamu No.I and No.[Ⅱ intrusions were compared,which shows the same comagmatic evolution for No.Ⅰ and No.Ⅱ intrusions.Combined with regional tectonic evolution and structural setting of No.Ⅰ in-trusion,the authors conclude that No.Ⅱ intrusion was formed in an island arc setting.关键词
地球化学/构造环境/SHRIMP U-Pb年龄/镁铁质-超镁铁质岩/夏日哈木铜镍矿床/东昆仑Key words
geochemistry/tectonics setting/SHRIMPU-Pb age/mafic-ultramafic intrusion/Xiarihamu Cu-Ni deposit/East Kunlun Mountains分类
天文与地球科学引用本文复制引用
杜玮,姜常义,凌锦兰,周伟,夏明哲,夏昭德..东昆仑夏日哈木铜镍矿床Ⅱ号岩体年代学、地球化学及其意义[J].矿床地质,2017,36(5):1185-1196,12.基金项目
本文得到中国地质调查局地质矿产调查专项(编号:1212011121089)、中央高校基本科研业务费项目(编号:310827172004、310827173401、310827171003)和国家自然科学基金资助项目(编号:41102045)的联合资助 （编号:1212011121089）
