| 东昆仑喀雅克登塔格辉长岩体地球化学研究及大地构造意义 |
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| 引用本文： | 任二峰,张桂林,邱炜,安守文.东昆仑喀雅克登塔格辉长岩体地球化学研究及大地构造意义[J].矿产与地质,2012(4):334-338,343. |
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| 作者姓名： | 任二峰 张桂林 邱炜 安守文 |
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| 作者单位： | 中国科学院青海盐湖研究所;青海省地质调查院;桂林理工大学 |
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| 摘 要： | 对东昆仑喀雅克登塔格地区的辉长岩所进行的时代及地球化学研究发现,该辉长岩为早泥盆世,属钙碱性系列,有向富镁方向演化的特点,岩石稀土总量根据测试精度在28.9×10-6～154×10-6,（La/Yb）N比值大于1,在4.1～5.1之间,表现为岩石显轻稀土富集特征（LREE/HREE在3.52～5.60）,岩石的Sm/Nd在0.23～0.25间,指示来源区可能与亏损地幔有关。δCe值在0.87～1.00,表现为负Ce异常,辉长岩来源于壳幔接合部位或富集型地幔源区.结合玄武岩构造环境判别图解可知,该辉长岩构造环境应是祁漫塔格加里东造山带造山后伸展环境下的产物。
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| 关 键 词： | 辉长岩 地幔源区 构造环境 喀雅克登塔格 |
Study on geochemistry of Gabbro in east Kunlun Kayakedengtage and their tectonic significances |
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| REN Er-feng,ZHANG Gui-lin,QIU Wei,AN Shou-wen.Study on geochemistry of Gabbro in east Kunlun Kayakedengtage and their tectonic significances[J].Mineral Resources and Geology,2012(4):334-338,343. |
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| Authors: | REN Er-feng ZHANG Gui-lin QIU Wei AN Shou-wen |
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| Institution: | 1.Qinghai Institute of Salt Lakes,China Academy of Sciences,Xining 810001,Qinghai; 2.Qinghai Institute of Geological Survey,Xining 810012,Qinghai; 3.Guilin University of Technology,Guilin 541004,Guangxi) |
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| Abstract: | Based on the age and geochemical studies about gabbro in Kayakedengtage of east Kunlun in Qinghai province,the gabbro shows the characteristics of enriched magnesium.The ∑REE contents 28.9×10-6-154×10-6 with the obvious enrichment of LREE（La/Yb）N1（4.1～5.1）（LREE/HREE contents 3.52～5.60）,Sm/Nd of rocks contents 0.23～0.25,they show the characteristics that the source originated from of mantle.However,the δCe belongs to 0.87～1.00,the rich Ce shows negative abnormity,they show the gabbro belong to the place of the joining part of the crust and the enriched mantle.Combined with the basalt tectonic discrimination diagrams,the tectonic environment of the gabbro belongs to the later orogenic belt outspread of Caledonian of Qimantage. |
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| Keywords: | gabbro mantle source tectonic environment Kayakedengtage |
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