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地质学报  2012 

危地马拉硬玉岩与硬玉化绿辉石岩的岩石学特征及其地质意义

, PP. 198-208

Keywords: 硬玉,硬玉岩,绿辉石岩,流体,交代,危地马拉

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Abstract:

位于北美-加勒比板块俯冲带内的危地马拉硬玉岩区产有硬玉岩、榴辉岩、钠长岩等岩石类型,但绿辉石岩还没有详细报导过。研究样品为该区的硬玉岩和绿辉石岩,前者主要由Jd端元含量较高的硬玉组成,具有粒、柱状镶嵌结构。硬玉晶体具有显著的成分振荡环带,其核部及其背散射电子图像的浅色区Jd端元含量为94.81%~95.48%;暗色区Jd含量大于97.92%。后者绿辉石岩具有交代结构,主要由绿辉石和硬玉组成。其中绿辉石的CaO(9.01%~10.80%)和MgO(6.09%~7.94%)含量较高,FeO(2.84%~4.89%)含量较低;硬玉的CaO、MgO和FeO含量变化范围较大,分别为0.59%~4.30%,0.26%~3.05%,0.76%~2.87%。硬玉岩中流体包裹体的存在,以及绿辉石岩中显著的硬玉交代绿辉石现象说明其成因与缅甸硬玉一样,是硬玉质流体通过结晶-交代作用形成。硬玉岩中硬玉振荡的环带结构反映形成时温度-压力-组份体系存在振荡变化,平直连续的环带边界反映结晶时P-T条件位于硬玉稳定的低温高压区域。该区绿辉石岩的硬玉化作用清楚,能够观察到三期硬玉岩化作用现象,说明绿辉石岩可能是在硬玉岩的形成过程中,硬玉质流体与原岩辉石岩作用的结果,这进一步阐明了俯冲带内硬玉岩区硬玉质流体的广泛透入性与结晶交代作用的多样性。

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