锆石变生特性及其类型划分

METAMICT FEATURES OF ZIRCON AND ITS DIVISION OF TYPES

利用物理测试方法，如Ｘ衍射和红外光谱等方法，测定锆石结构的完整性，进而划分锆石类型。文中指出，随着锆石的结晶程度变差而衍射峰变弱，甚至消失。在红外分析中利用图谱上的６１０ｃｍ（－１）处的吸收峰的变化确定锆石的变生程度是既方便又经济的有效方法，根据该处的吸收峰参数计算出变生系数（Ｈ／Ｍ），从而引出锆石从全结晶形态到强变生状态的变化特征，以达到解决它们有关问题的目的。

The completeness of zircon texture is determined by using physical determination method such as X-ray diffraction analysis and infrared absorption spectroscopy so as to divide the types of zircon. This paper points out that the diffraction peak becomes weak even disappears with the zircon's degree of crystalization getting poorer. In the infrared absorption spectroscopic analysis,the change of the absorption peak at 610cm-1 on the spectrogram can be used to determine the metamict degree of zircon,which is a convenient,economical and effective method. The metamict coefficient(H/M) is calculated in accordance with the absorption peak parameter at that place,thus leading to the changing characteristics of the zirconfrom the form of full crystalization to strong metamictization so that the aim of solving problems related with them can be achieved.