陆壳的生成:与赞歧岩类的联系

被引：5

作者：

Yoshiyuki Tatsumi

机构：

[1] InstituteforResearchonEarthEvolution(IFREE),JapanAgencyforMarine-EarthScienceandTechnology(JAMSTEC),Yokosuka-,Japan

来源：

科学通报 | 2008年 / 09期

关键词：

高镁安山岩; 赞歧岩类; 玻安岩; 板片熔融; 陆壳;

D O I：

暂无

中图分类号：

P588.15 [碱性岩];

学科分类号：

070901 ;

摘要：

陆壳的平均成分为中性,而某些典型岛弧岩浆岩也具中性的化学组成,因而,人们认为陆壳应产生于古老的会聚板块边界.中性陆壳形成的一个可能机制是直接产生于上地幔的安山质熔体.产于日本西南Setouchi火山岩带的赞歧岩类包括高镁安山岩(HMA),是俯冲板片熔融及其后的熔体-地幔相互作用的结果.该岩类形成于特殊构造环境(例如,热的岩石圈俯冲进入异常热的上地幔),这种环境可能在太古代时业已存在.富水的高镁安山岩岩浆很可能在地壳内固结形成高镁安山质岩体,然后这些岩体重熔产生了分异的赞歧岩类.目前,高镁安山岩岩浆的形成和分异可能正发生于Izu-Bonin Mariana(IBM)弧-沟系.这是因为:(1)IBM演化初始阶段以高镁安山岩岩浆作用为特征(2)IBM中地壳的波速VP与总体陆壳的波速一致.对具高镁安山质深成岩的VP估计也支持了这一点,但也不能排除英云闪长质岩在该岛弧中部地壳的存在.因此,陆壳的形成也有可能由幔源玄武质岩浆分异而产生.

引用

页码：978 / 990

页数：13

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