云南麻栗坡祖母绿生长环带特征  

Characteristic of Growth Zone of Emerald from Malipo,Yunnan Province

作　　者：邹妤[1] 孙婉洁 赵旭刚[1] 王蝶[3] 

机构地区：[1]昆明理工大学城市学院,昆明650051 [2]中国地质大学(北京)珠宝学院,北京100083 [3]昆明理工大学国土资源学院,昆明650093

出　　处：《硅酸盐通报》2017年第2期419-424,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(41502087);国家岩矿化石标本资源共享平台项目

摘　　要：利用宝石学、背散射电子图像和电子探针方法对云南麻栗坡祖母绿"生长环带"的颜色分带与化学组分的对应关系进行研究,并探讨其生长环带现象产生的原因。结果表明:云南麻栗坡祖母绿生长环带特征明显,生长环带颜色的差异与微量元素的种类和含量有关;属于典型的富Na、Mg、V、贫Cr型祖母绿,且绿色与Cr^(3+)、V^(3+)有关,并且Cr^(3+)、V^(3+)含量越高,祖母绿颜色越深;Cr^(3+)、V^(3+)含量差异直接导致了生长环带现象,产生深绿环带和浅绿环带,同时生长环带与生长期次有关,具有多期性特征。Corresponding relationship between the growth zone of Malipo emeralds from Yunnan and the chemical composition was studied by gemological,backscattered electron images and electron probe method. The forming reasons of growth zone were researched in this paper. The study shows that it is fairly common to observe the growth zone of malipo emerald from Yunnan. It is the content and species difference in trace elements between samples that caused the distinction in the color of growth zone. It is verified that Malipo emerald belongs to the type which is rich in vanadium,sodium and magnesium and poor in chrome. The green colour is related to the high content of impurity ion such as Cr^3＋and V^3＋.The difference of content in chromium and vanadium leads to the feature of growth zone,the deep green rim and light green core. The growth zone is related to the growth stages. Forming of Malipo emerald from Yunnan is characterized by multiple stages.

关 键 词：祖母绿 生长环带 电子探针 云南麻栗坡 

分 类 号：X703[环境科学与工程—环境工程]