| 甘肃红柳沟一带辉长—闪长岩地球化学特征及构造环境探讨 |
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| 引用本文： | 魏志军,黄增保,孙新春.甘肃红柳沟一带辉长—闪长岩地球化学特征及构造环境探讨[J].甘肃地质学报,2010(4):9-12. |
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| 作者姓名： | 魏志军 黄增保 孙新春 |
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| 作者单位： | 甘肃省地质调查院 |
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| 基金项目： | 中国地质调查局区域地质调查项目(200213000020) |
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| 摘 要： | 甘肃红柳沟一带分布大量的辉长—闪长岩,岩体主要由闪长岩组成,岩石的化学成分特点为SiO2介于47.65%～-51.52,Al2O3含量变化较大,TiO2=0.80%～1.17%,较岛弧拉斑玄武岩高(0.83%Pearce,1982),CaO含量较高为10.11%～0.52%,Mg#较低为32.66～33.23,m/f值0.48～0.50,MF=0.62～0.64,属铁质基性岩类。稀土总量较低,亏损高场强元素Ta、Nb、Hf、Zr、Ti及重稀土为特征。地球化学特征显示与板块俯冲碰撞有关,可能代表了哈萨克斯坦板块与塔里木板块早期俯冲的记录。
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| 关 键 词： | 辉长—闪长岩 地球化学特征 海西期 板块早期俯冲碰撞 甘肃红柳沟 |
Gabbro-diorite Geochemistry and Tectonic Setting of Hongliugou Area in Gansu Province |
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| WEI Zhi-jun; HUANG Zeng-bao; SUN Xin-chun.Gabbro-diorite Geochemistry and Tectonic Setting of Hongliugou Area in Gansu Province[J].Acta Geologica Gansu,2010(4):9-12. |
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| Authors: | WEI Zhi-jun; HUANG Zeng-bao; SUN Xin-chun |
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| Institution: | WEI Zhi-jun; HUANG Zeng-bao; SUN Xin-chun (Geological Survey of Gansu Province; Lanzhou 730000; China); |
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| Abstract: | Gabbro-diorite mass which exist in Hongliugou area of Gansu Province is characterized by: SiO2 47.65%～51.52%;TiO2 0.80%～1.17%,higher than the content of island arc tholeiite(0.83%,Pearce,1982);CaO 10.11%～0.52% Mg#32.66～33.23;value of m/f 0.48～0.50,MF=0.62～0.64.It should be iron basic rocks.Geochemical characteristics show the formation of rock originated from the collision and subduction,which may represent records of the early subduction between Kazakhstan Plate and Tarim Plate. |
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| Keywords: | gabbro-diorite geochemical characteristics Hercynian subduction and collision of plate Hongliugou in Gansu |
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