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华北克拉通对Rodinia超大陆裂解的响应——来自贺兰山北段小松山地区辉长岩地球化学、年代学及Hf同位素的新证据
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  • 英文篇名:Response of the North China Craton to the Rodinia supercontinent breakup:New evidence from petrochemistry, chronology and Hf isotope of the gabbro in Xiaosongshan area of northern Helan Mountain
  • 作者:朱强 ; 曾佐勋 ; 李天斌 ; 王成 ; 刘更生
  • 英文作者:ZHU Qiang;ZENG Zuoxun;LI Tianbin;WANG Cheng;LIU Gengsheng;Geological Survey of Anhui Province;Faculty of Earth Science, China University of Geosciences;Huazhong Tectonomechanical Research Center;Ningxia Monitoring Institute of Land and Resources Survey;Geological Survey of Ningxia;
  • 关键词:辉长岩 ; 锆石U-Pb年龄 ; 元素地球化学 ; Hf同位素 ; Rodinia裂解 ; 华北陆块 ; 新元古代
  • 英文关键词:gabbros;;zircon U-Pb age;;element geochemistry;;Hf isotope;;breakup of Rodinia;;North China Craton;;Neoproterozoic
  • 中文刊名:ZQYD
  • 英文刊名:Geological Bulletin of China
  • 机构:安徽省地质调查院;中国地质大学(武汉)地球科学学院;华中构造力学研究中心;宁夏回族自治区国土资源调查监测院;宁夏回族自治区地质调查院;
  • 出版日期:2018-06-15
  • 出版单位:地质通报
  • 年:2018
  • 期:v.37;No.277
  • 基金:安徽省国土资源科技项目《明光市管店—全椒县马厂一带金多金属矿控矿构造研究》(编号:2014-K-6)
  • 语种:中文;
  • 页:ZQYD201806011
  • 页数:12
  • CN:06
  • ISSN:11-4648/P
  • 分类号:113-124
摘要
华北克拉通西缘贺兰山北段小松山地区辉长岩锆石U-Pb年代学、岩石地球化学和锆石Hf同位素的研究结果表明,辉长岩的侵位结晶年龄为835.5±5.3Ma,即形成于新元古代早期,属于板内拉斑玄武岩系列岩石,总体上略富集轻稀土元素、大离子亲石元素Rb、Ba、La,略亏损高场强元素Th、Nb、Zr、Hf等;具有较高的εHf(t)值(5.83~7.87),其单阶段模式年龄tDM1为1075~1155Ma,两阶段模式年龄tDM2为1176~1289Ma。综合研究发现,辉长岩的原始岩浆起源于中元古代富集型地幔,形成于华北陆块西缘的板内伸展环境,说明华北陆块响应了Rodinia超大陆裂解,也是Rodinia超大陆的一部分。
        Zircon LA-ICP-MS U-Pb dating, petrochemistry and zircon Hf isotope study of the gabbros from Xiaoshongshan area of the North Helanshan show that the emplacement crystallization age is 835.5±5.3 Ma, suggesting early Neoproterozoic. The gabbros belong to intraplate tholeiite basalt series, and are slightly rich in LREE, rich in Rb, Ba, La, and slightly depleted in HFSE, Th,Nb, Ta, Zr and Hf; Hf isotopic data of the gabbros show high εHf(t) values(5.83~7.87), the single stage model age tDM1 is 1075~1155 Ma, and the two stage model age tDM2 is 1176~1289 Ma. Comprehensive studies suggest that the magma of gabbros originated from an enriched mantle in the Mesoproterozoic, and was formed in an intraplate extension setting on the western margin of the North China continental blocks. The authors thus infer that this magma event was a response of the North China continental blocksto the breakup of the Rodinia supercontinent. Therefore, it was also a part of the supercontinent.
引文
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