一类青田石蓝星的微结构及宝石学特征新议  

A new opinion of the microstructure and gemological characteristics of blue star mineral in one kind of Qingtian stone

作　　者：俞丹燕 方诗彬 严俊 严雪俊 盛嘉伟 张俭 YU Danyan;FANG Shibin;YAN Jun;YAN Xuejun;SHENG Jiawei;ZHANG Jian(Zhejiang Fangyuan Test Group Co.,Ltd.,Hangzhou 310013,Zhejiang,China;Wenzhou Institute of Science and Technology,Zhejiang University of Technology,Wenzhou 325024,China;College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou 310014,Zhejiang,China)

机构地区：[1]浙江方圆检测集团股份有限公司,浙江杭州310013 [2]浙江工业大学温州科学技术研究院,浙江温州325024 [3]浙江工业大学材料科学与工程学院,浙江杭州310014

出　　处：《矿产与地质》2020年第3期498-504,共7页Mineral Resources and Geology

基　　金：国家自然科学基金(51604242);浙江省自然科学基金(LY18E020015,LY1E020015);温州市基础性工业科技项目(G20180003)共同资助。

摘　　要：采用傅里叶变换显微红外光谱、X射线粉晶衍射、扫描电子显微镜结合X射线能量色散能谱首次就一类具有青黄色“地”的青田石蓝星矿物组成、晶型及微结构形貌予以较系统地探究。结果表明:该类具有青黄色“地”的蓝星主体矿物组成为绢云母,其邻近的黄色围岩主体矿物为叶蜡石,其中绢云母与叶蜡石存在较明显的分区特征而非混生,该发现与前人所报道的蓝星的“地”的主体物相为伊利石的结论迥异。同时,其中蓝色“星”的矿物组成为蓝线石,但其微观形貌特征并非呈现为前人曾报道的柱状或放射状针形结构,红外光谱表明该类蓝星中的蓝线石与标准的蓝线石的特征吸收峰位存在一定的频率位移。此外,首次发现在该类蓝线石中含有重晶石相,其中的重晶石的形成机制有待分析。Fourier transform microscopic infrared spectroscopy,X-ray powder diffraction,scanning electron microscopy and X-ray energy dispersive energy spectroscopy are applied for the first time to explore the mineral composition,crystal form and microstructure of Qingtian stone and blue star,one kind with the green and yellow"Di",systematically.The result shows that the main mineral composition of this type of blue star with greenish yellow"Di"is sericite,and the main mineral of its adjacent yellow wall rock is pyrophyllite.There is an obvious zonation of sericite and pyrophyllite distribution rather than mixture.This finding is quite different from the conclusion that the main body of Blue Star’s“Di”is illite by the predecessors.At the same time,the blue star mineral composition is the dumortierite,but its microstructure feature is not presented as the columnar or radioactive acicular structure reported by the previous researchers.The infrared spectrum indicates that the dumortierite in this type of blue star has a certain frequency shift to the characteristic absorption peak position of the standard dumortierite.In addition,it is found for the first time that this type of dumortierite contains a barite phase,and the formation mechanism of the barite remains to be analyzed in the future.

关 键 词：矿物学 青田石 蓝星 矿物组成 绢云母 蓝线石 显微红外光谱 

分 类 号：P578.958[天文地球—矿物学] O657.33[天文地球—地质学]