汉诺坝辉石岩包体中单斜辉石的微区微量元素组成特征及其地球动力学意义
In situ trace elemental compositions and geodynamic significance of clinopyroxene in pyroxenite xenoliths from Hannuoba
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摘要: 本文对来自汉诺坝玄武岩中的三类辉石岩包体的单斜辉石（Cpx）利用LA—ICP—MS进行了原位微区微量元素分析研究。金云母单斜辉石岩中的单斜辉石具有低Cr,Co和Ni，高CaO、Zr、Hf、Ta和LREE特征，并且具有较低的Mg^#，反映金云母单斜辉石岩可能是经受了后期交代作用的地慢岩浆堆晶产物尖晶石二辉橄榄岩中的石榴辉石岩脉体中的Cpx具有高Na2O低CaO特征，其Ti、Zr、Hf、Y含量明显高于其它石榴辉石岩Cpx中的含量，反映了石榴辉石岩脉体可能是富Na硅酸盐熔体与地幔尖晶石二辉橄榄岩反应的成因，部分石榴辉石岩包体的Cpx具有特征的La富集或微量元素（如Zr、Hf、Ta、Li、P、REE等）环状对称分布特征，暗示华北克拉通北缘可能存在多期次地幔交代富集作用．通过对同一Cpx颗粒中的流体包裹体密集区和干净区域的对比研究，发现Cpx中的流体包襄体不仅富集LILE和LREE，而且HFSE中的Nb、Ta、Zr和P也具有明显的富集特征，LREE和HFSE未发生明显分异，这可能暗示地幔交代流体中含有少量的络阴离子（如F^-和Cl^-等）．
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Key words:
- Hannuoba /
- Pyroxenite xenolith /
- Clinopyroxene /
- LA-ICP-MS /
- Trace elements /
- In situ microanalysis
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