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地质学报  2004 

东南沿海地区新生代火山作用和地幔柱

, PP. 781-788

Keywords: 新生代火山作用,地幔柱,火山链,太平洋板块俯冲作用,东南沿海

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Abstract:

通过本文的研究表明,东南沿海地区从沿海→内陆(牛头山→闽清→明溪)新生代玄武岩的年龄逐渐变小,具有火山链的特征;微量元素和Sr-Nd同位素特征与洋岛玄武岩(OIB)类似;上地幔具有过热状态和扰动的热结构;地球物理具有低的Vs异常及提供了在该区下面具有地幔柱的CT模式;火山岩具有较高的3He/4He同位素比值,因此提出了研究区下面存在地幔柱。进一步根据火山岩的热动力学参数,从沿海→内陆,随火山岩年龄变小,火山岩的碱性程度逐渐增加,岩浆起源的深度逐渐变深,局部熔融程度逐渐变小等特征,提出了地幔柱的形成是由太平洋板块俯冲诱发,地幔柱位于俯冲带上面,南海的扩张和新生代火山岩的形成是地幔柱作用的结果,并提出地幔柱成因演化模式。

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