山东刚玉巨晶的成因——来自矿物包裹体的证据  

Genesis of Megacrystal Corundum from Shandong Province——Evidence from Mineral Inclusions

作　　者：丁振华[1] 

机构地区：[1]厦门大学生命科学学院,福建厦门361005

出　　处：《矿物学报》2009年第4期442-446,共5页Acta Mineralogica Sinica

摘　　要：利用电子探针、扫描电镜分析技术在产自山东碱性玄武岩的刚玉巨晶中发现了尖晶石族氧化物包体,并有许多刚玉、钛铁矿、高硅氧化物、辉石、长石、方解石等包体。这些包体矿物的化学成分明显与该地区相应的巨晶矿物不同,具有深源性的特征。刚玉巨晶具有世代现象,其生长具有明显的阶段性,是在一种高度演化的富含SiO2岩浆中生成,生长过程极其复杂。A great amount of mineral inclusions were found in megacrystal corundum from Shandong Province with methods of electron microprobe analysis, scanning electron microscopy. The mineral inclusions are spinel, tiny corundum, ilmenite, high-silicon oxide, pyroxene, feldspar, calcite, etc. Compared with megacrystal spinel and py- roxene, the inclusions are significantly different in compositiorL Generation and growth strips showed that megacrystal corundum developed with clear phases. Megacrystal corundum formed from one kind of highly evolved magma which contained abundant SiO2, with very complicated genesis.

关 键 词：刚玉 巨晶 包裹体 氧化物 地幔交代作用 

分 类 号：P571[天文地球—矿物学] P578.4[天文地球—地质学]