三维荧光光谱在蓝宝石成因及产地指示作用中的研究——以斯里兰卡和老挝蓝宝石为例

Research of Geographical Origin of Sapphire Based on Three-Dimensional Fluorescence Spectroscopy:A Case Study in Sri Lanka and Laos Sapphires

判别蓝宝石成因及产地是宝石学研究中的重要内容,区分蓝宝石属于变质岩型或玄武岩型通常需要使用光谱学分析、内含物分析、化学成分分析结合的方法。选取斯里兰卡变质岩型蓝宝石和老挝玄武岩型蓝宝石进行研究。两地蓝宝石的紫外-可见-近红外吸收光谱测试、化学成分分析结果分别符合变质岩型和玄武岩型蓝宝石的基本特征。三维荧光光谱测试表明,斯里兰卡变质岩型蓝宝石出现了发射波长为540~560和560~580nm的荧光,O_(2)-Ti^(4+)导致的420~440nm荧光和Cr^(3+)导致的694nm荧光;老挝玄武岩型蓝宝石只出现了O_(2)-Ti^(4+)导致的发射波长为418nm的荧光,且强度很弱。两种蓝宝石的主要区别是斯里兰卡变质岩型蓝宝石总体荧光强度较强,且拥有发射波长为540~560和560~580nm的两段荧光。

Determination of the geographic origin of blue Sapphire is important in gemological research.Metamorphic Sapphires from Sri Lanka and basalt-related Sapphires from Laos are tested.UV-Vis-NIR chemical analysis fits the basic characteristics of Metamorphic and basalt-related Sapphires.Three-dimensional fluorescence spectroscopy revealed distinct fluorescence at around 420 to 440 nm,540 to 560 nm,560 to 580 nm and 694 nm of Metamorphic Samples.Meanwhile,basalt-related samples present fluorescence at 418 nm.In this research,the main difference between the two types of Sapphires is that metamorphic samples present strong fluorescence.Besides,fluorescence at 540 to 560 nm,560 to 580 nm occurs only in metamorphic Sapphires.