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为进一步研究富锶文石的晶体结构、颜色成因和矿物成因 ,采用振动光谱、EMPA和SEM对富锶文石进行了测试和分析。红外光谱、拉曼光谱测试分析表明 ,由于富锶文石存在着锶与钙的类质同像现象 ,其红外光谱和拉曼光谱中CO2 -3 的v1、v2 、v3 、v44种振动模式波数介于文石和碳酸锶矿之间 ,与文石、碳酸锶矿等文石型碳酸盐振动光谱特征一致 ,并且文石的v4存在分裂峰。EMPA面扫描发现Ca2 + 、Sr2 + 的分布与富锶文石内部环带的分布存在一致性。由于CuO含量较少 ,分布规律不明显。SEM分析发现在环带之间存在空隙 ,各环带中富锶文石结晶程度和晶体表面特征不一 ,不同颜色和形态的环带反复生长。生长过程中 ,流体成分中各种元素的含量、温度和压力的变化造成不同颜色环带的形成 ,反映了该富锶文石是经过不同时期沉积形成的
In order to further study the crystal structure, color and mineral origin of strontium-rich aragonite, the strontium-enriched aragonite was tested and analyzed by vibrational spectroscopy, EMPA and SEM. The results of IR and Raman spectroscopy show that the strontium and calcium isomorphism exists in strontium rich aragonite. The wavenumber of vibration modes v1, v2, v3 and v4 of CO2 -3 in IR and Raman spectrum Between aragonite and strontium carbonate, and aragonite, strontium carbonate and other aragonite carbonate vibration spectral characteristics consistent, and the presence of aragonite v4 split peak. The distribution of Ca2 + and Sr2 + in EMPA surface scan is consistent with that of the strontium aragonite. Due to the low content of CuO, the distribution is not obvious. SEM analysis found that there are gaps between the rings, the bands of strontium aragonite-rich crystals and the crystal surface features vary, and the rings of different colors and shapes grow repeatedly. During the growth process, the content of various elements in the fluid composition, the changes in temperature and pressure cause the formation of different color annuli, reflecting that the strontium-rich aragonite is deposited through different periods of deposition