黑云母的红外光谱研究

关于云母族矿物的红外光谱研究,国内外一些学者曾做过不少工作。笔者就近年来所收集到的一些产自宁芜地区、南岭地区花岗岩类岩石中27个黑云母样品,进行了红外光谱测定,确定了某些特征吸收峰的偏移及其与化学组分之间的关系,并探讨了黑云母矿物中主要金属阳离子的相互置换和

On the Study of the Infrared Spectra of Biotite

The infrared spectra of 27 biotite samples, collected from various granitic bodies of southeastern China including Nanling and middle and lower Yangtse Valley, were obtained on four different types of infrared spectrometers. The res- ults are well correlated. According to Fosters classification all the samples can be divided info two sexier-Mg-biotite and Fe2+ -biotite. The MFA values (Mg/ Mg+Fe23 +Fe3+ +Mn+ivAl) of the Mg-biotite range from 0.01 to 0.20, while those of the Fe2+ -biotite from 0.4 to 1.40. The shift of some characteristic ab- sorption bands in consequence of their chemical compositions is determined and discussed. The substitution of the major cations for each other is also discussed and referd to their crystal structure. The investigation shows that it is possible to indicate and estimate the ca- tion contents in the octahedral sites and the ratio of Al/ Si in the tetrahedral sites of biotite by means of the infrared spectrometry.