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地球学报  2006 

青藏高原东部贡觉盆地新生代火山岩特征及其构造意义

DOI: 10.3975/cagsb.2006.04.02

Keywords: 火山岩,贡觉盆地,构造环境

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Abstract:

藏东贡觉盆地古近纪火山岩形成于印度-欧亚板块碰撞造山后的伸展环境中,火山活动受水平剪切-走滑断裂带控制。火山岩以高SiO2、Al2O3、K2O、Na2O和低MgO、TiO2为特征,属高钾钙碱性中酸性火山岩。火山岩中富集大离子亲石元素(LILE)、轻稀土元素(LREE),亏损高场强元素(HFSE)和一部分相容元素(Co、Ni、V、Sc);无Eu异常但有弱的Ce负异常。火山岩源区可能是经历了壳源混合作用的富集交代地幔。富集组分来自壳源,它们沿古俯冲带以再循环方式进入地幔楔,并与地幔发生交代作用。

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