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地质通报  2004 

埃达克岩的多样性

, PP. 959-965

Keywords: 埃达克岩,多样性,高镁埃达克岩,TTG,高钾钙碱性埃达克岩,高镁和钾的埃达克岩,钾质埃达克岩

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Abstract:

埃达克岩具有多样性,大体可分为下列几种①典型的埃达克岩(adakite),源于贫K的拉斑玄武岩,大多是由俯冲板片熔融形成的;②高镁埃达克岩(highMgadakite,HMA),以富Mg#和Cr、Ni为特征;③TTG岩套,不同于典型的adakite,太古宙的TTG更富Si和贫Mg;④高钾钙碱性埃达克岩(high-Kcalc-alkalineadakite,HKCAA),以富K和贫Mg、Cr、Ni为特征;⑤高钾和镁的埃达克岩(highKandMgadakite,HKMA);⑥钾质埃达克岩(SuperKadakite,SKA).研究表明,只要达到形成埃达克岩所需要的高压条件,有足够的热源使源区物质发生部分熔融,所形成的熔体即具有埃达克岩的特征.而埃达克岩的多样性则是由于构造环境的差异(消减带或下地壳)、源岩性质的差异(基性岩或酸性岩)、压力的差异(地壳厚度的大小)以及围岩的差异(与地幔或地壳发生混合作用)造成的.

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