坦桑尼亚温扎红宝石的宝石学及谱学特征  

Gemmological and Spectral Characteristics of Ruby from Winza,Tanzania

作　　者：郑一梦 裴景成[1,2] 赖潇静 ZHENG Yimeng;PEI Jingcheng;LAI Xiaojing(Gemmological Institute,China University of Geosciences,Wuhan 430074,China;Hubei Gems and Jewelry Engineering Technology Research Center,Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)珠宝学院,湖北武汉430074 [2]湖北省珠宝工程技术研究中心,湖北武汉430074

出　　处：《宝石和宝石学杂志（中英文）》2024年第4期1-11,共11页Journal of Gems & Gemmology

基　　金：国家自然科学基金项目(42002041)。

摘　　要：坦桑尼亚温扎地区产出透明度高、颜色亮度高、色彩饱和度高且常产出粒度大的红宝石,但针对坦桑尼亚温扎红宝石的系统研究较少。利用常规宝石学仪器、激光剥蚀电感耦合等离子体质谱仪、紫外-可见光分光光度计、傅里叶变换红外光谱仪、拉曼光谱仪和三维荧光光谱仪对10颗产自坦桑尼亚温扎的红宝石样品进行系统性的研究与分析。结果显示,坦桑尼亚温扎红宝石含有韭闪石包裹体、气液包裹体、蓝色色区和具有生长间断的负晶包裹体,蓝色色区与较高的Ti元素含量有关,具有产地意义;温扎红宝石具有高Cr和高Fe的特征,两种元素的含量均超过500×10^(-6),并具有Ti、Mg、V、Ni、Ga等微量元素;紫外-可见光光谱显示清晰的Cr谱,同时也呈现出Fe和Ti的影响;几乎所有样品的红外光谱均可见特征的3160 cm^(-1)处吸收峰,常伴随着3240 cm^(-1)和2420 cm^(-1)吸收峰(称为“3160组”),为温扎红宝石的特征峰;拉曼光谱显示散射峰与[AlO_(6)]基团的伸缩、弯曲振动有关,由对称弯曲振动(O-Al-O_(bend))引起的416 cm^(-1)处吸收峰显示最强的光谱特征;三维荧光光谱中显示4个清晰的荧光峰,以λ_(ex)=408 nm/λ_(em)=694 nm峰为最强。Rubies produced in the Winza region of Tanzania are highly transparent,have high colour brightness,high colour saturation and are often produced in large grain sizes,but few systematic studies have been carried out on the rubies from Winza,Tanzania.Systematic study and analysis of 10 ruby samples from Winza,Tanzania were carried out using conventional gemmological instruments,laser ablation inductively coupled plasma mass spectrometry,ultraviolet-visible spectrophotometer,Fourier transform infrared spectroscopy,Raman spectrometry and 3D fluorescence spectrometer.The results show that the rubies from Winza,Tanzania,contain pargasite inclusions,gas-liquid inclusions,blue colour zones,and negative crystal inclusions.The blue colour zone is associated with higher Ti elemental content and is of provenance significance.Rubies from Winza are characterized by high Cr and high Fe,all of which exceed 500×10^(-6)and that it also contains trace elements such as Ti,Mg,V,Ni,and Ga.The UV-Vis spectrum shows a clear Cr spectrum and also exhibits the influence of Fe and Ti.The 3160 cm^(-1)absorption peak that is visible in almost all samples,is often accompanied by 3240 cm^(-1)and 2420 cm^(-1)absorption peaks,called the“3160 group”.Raman spectra show scattering peaks related to the stretching and bending vibrations of the[AlO_(6)]group,with absorption peak at 416 cm^(-1)caused by symmetric bending vibrations(O-Al-O_(bend))showing the strongest spectral features.3D fluorescence spectra show 4 clear fluorescence peaks and theλ_(ex)=408 nm/λ_(em)=694 nm peak is the strongest one.

关 键 词：红宝石 宝石学特征 化学成分 谱学特征 坦桑尼亚温扎 

分 类 号：TS93[轻工技术与工程]