摘要:
在实地考察和分析前人资料的基础上, 简要地介绍了山东昌乐锆石的产出特征。通过常规的宝石学测试方法、X-射线荧光光谱分析和激光剥蚀电感耦合等离子体质谱仪(LA-ICP-MS)对该地区锆石的物理性质、内外部特征及化学成分进行了研究。结果表明, 该地区锆石粒度较大, 整体透明度较好, 颜色呈深浅不一的褐色, 以深褐色为主; 主要由ZrO2和SiO2组成, 微量元素主要有Fe, Ti, P, Sc, Ni等杂质元素, 还有部分放射性元素和稀土元素; 放射性元素主要为U和Th, Th/U比值均大于0.4(1个数据例外); 稀土元素以富钇族元素为特征, 富集HREE, 明显的Ce正异常(2～13), 微弱的Eu负异常(0.69～0.76)。另外, 昌乐锆石放射性核素的放射性比活度非常低。综合特征表明, 昌乐锆石是一种具有利用价值的宝石资源。
Abstract:
In this paper, the occurrence characteristics of the zircon from Changle, Shandong Province are introduced briefly on the basis of the spot investigation of the author and the previous work of other researchers. The physical properties, the internal and external features and the chemical compositions are studied by using the conventional gemmological methods, X-ray fluorescence analysis(XRF)and LA-ICP-MS. The results show that the zircon generally has good transparency and it is big grain with brown of different shades, mostly dark brown. The main chemical compositions are ZrO2 and SiO2. The trace elements are composed of impurity elements which are mainly Fe, Ti, P, Sc, Ni and so on, radioactive elements such as U and Th, and rare earth elements. Most of Th / U ratios are higher than 0.4( with one exception). REEs are characterized by yttrium group and rich in HREEs. The zircon has pronounced positive Ce anomalies and slightly negligible Eu anomalies. In addition, the specific radioactivity of radioactive elements of zircon from Changle is very low. All the characteristics mentioned above show that the zircon from Changle is a gem resource with its value in use.
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