生物成因与无机成因文石的FTIR光谱区别  

THE FTIR SPECTRA DIFFERENCE BETWEEN BIOGENIC AND ABIOGENIC ARAGONITES

作　　者：张刚生[1] 李浩璇[2] 

机构地区：[1]清华大学材料科学与工程系,北京100084 [2]广西大学化学化工学院,广西南宁530004

出　　处：《矿物岩石》2006年第1期1-4,共4页Mineralogy and Petrology

基　　金：广西教育厅科研基金资助项目(批准号:200420-6)

摘　　要：对16种贝壳交叉页片层中生物成因文石的FT IR谱进行测量,并与无机成因文石进行对比和统计分析后,首次发现生物成因与无机成因文石的FT IR光谱有明显可区分的特征,生物成因文石2ν带(面外弯曲振动)频率平均值为863.4 cm-1,而无机成因文石该带的平均值为855.5 cm-1,两者频率位移达7.9 cm-1。因此文石的2ν带可作为指纹带鉴别生物和无机成因文石。The FTIR spectra of biogenic aragonites in crossed lamellar layers of 16 species of mollusk shells were statistically analyzed and compared with those of abiogenic aragonites which include the geological and synthetic aragonites. It is firstly observed that the internal vibration frequencies of carbonate ions of biogenic aragonite are clearly different from those of abiogenic aragonites. Particularly,the frequency of v2 band （out-of-plane bending of carbonate ions） in biogenic aragonites with a mean value of 863.4 cm^-1 is clearly higher than that of abiogenic aragonites with a mean value of 855.5 cm^-1. The mean frequency shift of v2 band between these two kinds of aragonite is up to 7.9 cm^-1 ,so it is suggested that the v2 band can be used as a fingerprint band to discriminate the biogenic and the abiogenic aragonites.

关 键 词：文石 FTIR光谱 面外弯曲振动 频率位移 

分 类 号：P575.4[天文地球—矿物学]