天水渭北地区花岗岩类的岩石地球化学特征Lithogeochemical Features of Granitiods from the Northern Area of Weihe River in Tianshui, Gansu Province
李永军;栾新东;付国民;李注苍;
摘要(Abstract):
天水渭北地区地处祁连造山带与北秦岭造山带的结合部位。在渭河断裂以北出露广泛的花岗岩类属铝过饱和岩石,为钙碱性岩类。前石炭纪花岗岩类w(Al2O3)/[w(Na2O+K2O+CaO)]值均小于1.1;石炭纪以来岩体w(Al2O3)/[w(Na2O+K2O+CaO)]值大多大于1.1;岩体贫大离子亲石元素如Ba、Rb、Sr、Y、Ta、Be、B、Zr、Nb,低亲硫元素Ga、Cu,而高Mo、Sn、Bi、W等高温热液成矿元素和亲铁元素Se、Cr、Ni、Co。稀土元素显示石炭纪以来岩体形成于稳定大陆环境,前石炭纪岩体的形成环境与造山作用密切相关。
关键词(KeyWords): 花岗岩;地球化学特征;渭北地区;甘肃天水
基金项目(Foundation): 中国地质调查局地质调查项目“天水市幅1:2,5万区域地质调查”(2000130001017])
作者(Author): 李永军;栾新东;付国民;李注苍;
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参考文献(References):
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