摘要
根据不同地区和时代84件碳酸盐样品的阴极发光和Fe,Mn元素分析,在本次研究使用的仪器和实验条件下,方解石和白云石的阴极发光性与其Fe,Mn含量之间存在如下关系:Mn<40μg/g(ppm)时,其阴极发光性主要受Mn的绝对含量控制,当Mn<20μg/g时,不具阴极发光;Fe>5000μg/g时,其阴极发光性与Fe的绝对含关系更为密切,当Fe>10000μg/g时,不具阴极发光;Mn>40μg/g,Fe<5000μg/g时,其阴极发光性受Fe/Mn比值的显著控制,此时当Fe/Mn<7时,具强的阴极发光,30>Fe/Mn>7时,具中等强度的阴极发光,Fe/Mn>30时,具弱的阴极发光。两个热液碳酸岩中单晶白云石样品的阴极发光性和稀土元素含量间的关系说明,碳酸盐矿物的阴极发光性可能还与某些稀土元素的存在有关,它们可能是某些样品具低激活电压和长发光余辉的原因。
Eighty-six carbonate samples,from Sichuan,Guizhou and Shanxi,ranging in age of Ordovician,Carboniferous and Permian,were analysed for iron and manganese by atomic absorption spectrophotometry and observed under luminoscope. The results show the following.
1. Cathodoluminescence of carbonate minerals is mainly controlled by the absolute amount of manganese when the concentration of manganese is below 40 μg/g. Carbonate containing manganese less than 20μg/g will not luminesce.
2. Cathodoluminescence of carbonate minerals is mainly controlled by the absolute amount of iron when the concentration of iron is above 5 000μg/g. Carbonate containing iron more than 10000μg/g will not luminesce.
3. Cathodoluminescence of carbonate minerals is obviously controlled by Fe/Mn ratios when the concentration of manganese is above 40μg/g and concentration of iron is below 5 000μg/g . The samples with Fe/Mn ratios more than 30 display a generally weak luminescence, with Fe/Mn ratios less than 7 displlay a generally bright luminescence,and with Fe/Mn ratios between 7 and 30 display a generally moderate luminescence.
In addition,the cathodoluminescence of carbonate minerals could be related to some rare earth elements which perhaps is the results of lower activated voltage and longer afterglow duration of some samples.
出处
《矿物岩石》
CAS
CSCD
1992年第4期74-79,共6页
Mineralogy and Petrology
基金
国家自然科学基金(48970116)的资助
关键词
碳酸盐矿物
阴极发光性
铁
锰
含量
carbonate mineral
cathodoluminescence
activator
quencher
