赵鹏彬,李维成,罗乾周,彭海练,李毅,李武杰,张栓厚.内蒙北山鹰嘴红山花岗岩体形成时代及构造环境分析[J].西北地质,2019,52(4):1-13
内蒙北山鹰嘴红山花岗岩体形成时代及构造环境分析
Formation Age and Tectonic Environment of Yingzuihongshan Granite in Beishan, Inner Mongolia
投稿时间:2019-02-05  修订日期:2019-07-27
DOI:
中文关键词:  岩体时代;构造环境;花岗岩;鹰嘴红山;内蒙
英文关键词:formation age;tectonic environment;granite;Yingzuihongshan;Inner Mongolia
基金项目:内蒙古自治区地质勘查基金项目(NMKD2014-09、04-2-KD05)、(06-2-KC24)资助
作者单位E-mail
赵鹏彬 中国地质大学(北京)地球科学与资源学院, 北京 100083
陕西省矿产地质调查中心, 陕西 西安 710068 
 
李维成 陕西省矿产地质调查中心, 陕西 西安 710068 316695416@qq.com 
罗乾周 陕西省矿产地质调查中心, 陕西 西安 710068  
彭海练 陕西省矿产地质调查中心, 陕西 西安 710068  
李毅 陕西省矿产地质调查中心, 陕西 西安 710068  
李武杰 陕西省矿产地质调查中心, 陕西 西安 710068  
张栓厚 陕西省矿产地质调查中心, 陕西 西安 710068  
摘要点击次数: 207
全文下载次数: 218
中文摘要:
      鹰嘴红山岩体位于内蒙古西部北山成矿带东段,岩性主要为黑云母二长花岗岩、似斑状黑云母二长花岗岩及钾长花岗岩。前人对该岩体的形成时代存在志留纪和泥盆纪的不同认识。笔者采用LA-ICP-MS锆石U-Pb定年获得似斑状黑云母二长花岗岩(423.1±1.5)Ma的年龄数据,表明二长花岗岩形成时代为中志留世。鹰嘴红山岩体属钙碱性-高钾钙碱性,过铝质岩石系列;在原始地幔标准化蛛网图中,显示大离子亲石元素Rb、Th、K相对富集,高场强元素Ta、Nb、Zr、Ti相对亏损,Hf相对富集;REE总量较高,HREE微弱分异,LREE分异强烈;在球粒陨石标准化图上显示稀土元素呈右倾型配分模式,轻重稀土元素之间分馏程度较低,Eu强烈亏损(δEu=0.33~0.71)。结合花岗岩岩石成因类型研究和区域研究成果,认为鹰嘴红山花岗岩是在两侧陆块碰撞过程中大陆地壳加厚重熔形成的。
英文摘要:
      Yingzuihongshan pluton is located at the eastern part of Beishan metallogenic belt in western Inner Mongolia, which is mainly consists biotite monzonite, porphyritic biotite monzonite and potassic granite. Previous studies have different views on the formation age of the rock mass, that is, it was formed in Silurian or Devonian. In this paper, the LA-ICP-MS zircon U-Pb dating of porphyritic biotite monzogranite obtains an age data of (423.1±1.5) Ma, indicating that the formation age of monzogranite was formed in Middle Silurian. Yingzuihongshan pluton belongs to calc-alkaline-high potassium calc-alkaline, peraluminous rock series. In primitive mantle normalized spider diagram, the samples are enriched in large ions lithophile elements (Rb, Th, K), while they are depleted in high field strength elements (Ta, Nb, Zr, Ti), with relatively enriched Hf. These rocks are characterized by LREE enrichment and depleted HREE, with obvious Eu anomaly and "right-deviation" REE distribution. Based on the testing data and some previous research results, it's suggested that Yingzuihongshan granite was formed by partial melting of lower crust during the collision stage of continental blocks.
查看全文  查看/发表评论  下载PDF阅读器
关闭