中国辽宁复县金刚石中新发现的碳化钛矿物

TiC Inclusion First Found in Diamond from Fuxian,Liaoning of China

在我国辽宁复县金刚石中首次发现了碳化钛(TiC)矿物包裹体。该矿物包裹体呈板状,颗粒大小为50μm×35μm×8μm。碳化钛矿物的颗粒表面平整,成分纯净,能谱和电子探针分析确定其仅由Ti和C两种元素组成。利用CCD单晶衍射仪对碳化钛矿物进行了单晶德拜衍射,获得了该矿物包裹体的衍射数据,证实为碳化钛矿物包裹体。结构分析表明,产出于金刚石中的包裹体矿物碳化钛同时存在立方结构和菱面体结构两套衍射,根据X射线结构分析结果与前人对于TiC高压实验资料的对比,认为该金刚石包裹体矿物碳化钛原始形成的压力超过18 GPa。

The titanium carbide（TiC） mineral inclusions have been found for the first time in diamond from Fuxian,Liaoning of China,appearing plate,particle size of about 50 μm×35 μm×8 μm.Spectroscopy and electron microprobe analysis show only two kinds of Ti and C elements and flat surface on the TiC mineral.CCD single crystal diffraction analysis confirmed the inclusion to be titanium carbide mineral inclusion based on the mineral inclusion Debye diffraction data.Cubic structure and rhombohedral structure simultaneously exist in the titanium carbide（TiC） on the basis of crystal structural analysis.It is suggested that the formation pressure of titanium carbide mineral in diamond is 18 GPa higher,contrasting this analysis result to TiC high-pressure experiment results reported in previous relevant publications.