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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
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.
作者姓名:魏志军  黄增保  孙新春
作者单位:甘肃省地质调查院
基金项目:中国地质调查局区域地质调查项目(200213000020)
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。

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
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.
Authors:WEI Zhi-jun; HUANG Zeng-bao; SUN Xin-chun
Institution:WEI Zhi-jun; HUANG Zeng-bao; SUN Xin-chun (Geological Survey of Gansu Province; Lanzhou 730000; China);
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.
Keywords:gabbro-diorite  geochemical characteristics  Hercynian  subduction and collision of plate  Hongliugou in Gansu
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