6 . on the ground of all these research works , we studied the magma crystallization - assimilationary mechanism that works on the shandong sapphire and its bands , we also analysed the relationship between this mechanism and the isolated or open condition 6 、在上述研究基础上，讨论了山东昌乐蓝宝石及其环带形成的岩浆结晶-同化混染联合作用机制及其与封闭开放条件的关系。
The compositions of usual elements and rare earth elements and inclusions of corundum megacrysts related to alkali basalt in changle , shandong province , are analyzed . in the main parts of corundum megacrysts are a large number of fluid - melting inclusions , zircon , ta - columbite inclusions , and in the central crystal core are a large number of melting inclusions . the corundum megacrysts were formed in different periods and different physical chemistry conditions . the crystal core was formed in magma system , and the main parts were formed in inhomogeneously geochemical conditions in which magam and fluid phases coexisted 分析山东昌乐与碱性玄武岩有关的刚玉巨晶不同部位的常量元素、稀土元素及包裹体组成.刚玉巨晶的主体以大量流体?熔体包裹体、锆石、铌(钽)铁矿包裹体为主，而巨晶中的“晶核”部位则以大量的熔体包裹体为主，反映研究区的刚玉巨晶是在不同的阶段形成的.刚玉“晶核”以及“铜皮刚玉”形成于熔体相为主的体系中，而主体刚玉则形成于熔体?流体过渡的急剧变化的不均一的地球化学环境中
4 . three type of basalt is recognized in changle region : a , sapphire - embodied alkli - olivine - basalt of niushan group ( most distributed in fangshan ) , enriched with a large number of mantle - orignated xenoliths with different extent of weathering ; b , alkli - olivine - basalt of niushan group with little sapphire embodied , but contan a few mantle - orignated xenoliths usually samller than that of fangshan , most of the mantle - orignated xenoliths weathered seriously only lefting with some vacant caves , this kind of rock mostly lies in cangshan , taohuashan . and qiaoguan volcanic vent , contain amount of ilmenite ; c , olivine - basalt of yaoshan group , contain neither xenoliths nor sapphire 4 、在昌乐地区区分出三类主要的玄武岩： a ，牛山组含矿的碱性橄榄玄武岩，位于方山，含大量的大小不一的风化蚀变程度不同的地幔岩包体； b ，牛山组几乎不含矿的碱性橄榄玄武岩，含少量地幔岩包体，且包体一般比方山小，多数已经遭严重风化而只留下空洞，含有相当数量的钛铁矿，主要位于北岩南部的苍山，桃花山及乔官火山口。
We have studied the geological and geochemical characteristics of sapphire from shandong changle , comparing this with other sapphire from hainan ect , researching the mechanism of shandong sapphire , especially the mechanism of the sapphire bands , and thus gave the instruction for searching sapphire deposits and changing its color 本文通过对山东昌乐蓝宝石的地质与地球化学研究，结合对海南等其它蓝宝石特征的比较分析，探讨山东昌乐蓝宝石特别是其环带的形成机制，从而为蓝宝石找矿以及蓝宝石的加工和改色提供指导。
Speaking from its outline , shallow and deep color existing alternately is the direct reason why the bands emerged , while the periodical change of the total fe content in the sapphire is the foundmental reason ; in the same band of the same sapphire , the total fe content is nearly the same , so in this sense any spot can respresent the whole band in which the spot lies ; in one sapphire , the deep - color band must contain the higher fe than the shallow one ; the sapphire which exists bands must have a black or a dark blue core , where the fe content is usually higher than other bands . 2 研究表明，山东昌乐的蓝宝石普遍发育环带，从外观上讲，蓝宝石中深浅色度的交替出现是出现环带的直接原因，而总fe含量的近周期性变化是形成蓝宝石环带的根本原因；同一蓝宝石的同一环带，其总fe的含量几乎相同，所以该环带上的任何一个成分点都可以代表整条环带的成分；同一蓝宝石的不同环带，颜色越深，含fe越高，颜色越浅，含fe则越低；凡出现环带的蓝宝石，其核部总是深黑色或者蓝黑色，而其含铁量一般都比其它部位高。
