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埃达克岩与构造环境

, PP. 101-108

Keywords: 埃达克岩,构造环境,定义,地球化学

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Abstract:

埃达克岩是目前国内学术界争论的焦点之一。埃达克岩的原始定义指的是形成于岛弧环境的高铝高锶而贫重稀土的一类中酸性岩浆岩,而众多事实表明埃达克岩并非都形成在岛弧环境,底侵玄武岩以及下地壳熔融也可以形成埃达克岩。作者认为,岩石命名是一种描述性的表述,不应当与其成因及其形成的构造环境联系起来,实际上,也没有一种岩石固定只形成在一种构造环境。埃达克岩的定义指的是一系列地球化学指标,“年轻的板片熔融”是对Adak岛的埃达克岩的一种解释,并非埃达克岩定义的一部分。

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