论文部分内容阅读
对山东栖霞具不同结构的“干”尖晶石相橄榄岩进行了全岩化学、微量元素 ,矿物成分和单斜辉石微量元素分析和对比。表明在橄榄岩从粗粒结构向剪切结构的转化中 ,随着变质变形作用的增强存在着复杂的熔 /流体的加入富集和熔体的提取亏损作用 ;交代介质属具强渗透性的 Si O2 不饱和的硅酸盐碳酸岩熔体。同时发现不同结构橄榄岩中单斜辉石的 REE与其全岩的 REE程度有如下的关系 :粗粒结构橄榄岩中矿物与岩石的差别最大 ,但 REE的配分形式可以反映全岩的情况 ;剪切结构橄榄岩中两者的差别较小。其它高度不相容微量元素可能主要赋存在粒间组分或 /和矿物流体包裹体中
The whole rock chemistry, trace elements, mineralogical compositions and clinopyroxene trace elements were analyzed and compared with “dry” spinel peridotites with different structures in Qixia, Shandong Province. The results show that in the transition from coarse-grained structure to shear structure, peridotite has complex melting / fluid addition and enrichment and melt extraction loss with the enhancement of metamorphism and deformation. The metasomatism is of strong permeability Si O2 unsaturated silicate carbonate melt. It is also found that the REE of clinopyroxenes from different types of peridotites has the following relationship with the degree of REE of the whole rock: the difference between mineral and rock in the coarse-grained peridotite is the largest, but the REE species can reflect the whole rock; The difference between the cut-peridotites is small. Other highly incompatible trace elements may predominate in intergranular components or / and mineral fluid inclusions