Raman Spectra Study on Silicate Melt Structure at Basaltic Composition Region
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摘要: 采用半导体脉冲激光光源和时间分辨探测技术, 对Ab -An -Di相图同结线附近处于玄武岩成分区的2个硅酸盐样品进行了升温过程的Raman光谱研究.研究了该成分区域中玻璃-晶体-熔体高温下的相转变、升温过程及其熔体的特征光谱的变化特点.发现高温熔体结构与低温玻璃结构存在明显区别, 晶体对熔体结构有继承性.同时观察到了Ab12 An3 6Di52在熔态时的分相作用, 可能反映了该组分液态不混溶的发生.通过对高频区的解谱, 初步探索了体系中各结构单元的种类及含量与温度的关系.Abstract: Two silicate glass samples at basaltic composition region, which are near the cotectic-line in Ab-An-Di phase diagram, were studied by high-temperature Raman spectroscopy using pulsed semiconductor laser and time-resolved detection technique from 298 K to 1 673 K. Temperature-dependent characteristic spectra and phase transition of glass, crystal and melt were observed. It is obvious that there exist some differences between the structure of glass and melt. The heredity of crystal structure from melt structure is also discussed. The melt phase separation of Ab12An36Di52, occurred in the high-temperature melt state, is studied, which reveals a very important immiscible feature in magmatic process. The types and relative contents of the different structure units correlative to temperature are discussed by Gaussian deconvolution of the high-frequencies spectrum region.
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Key words:
- silicate melt /
- high-temperature Raman spectroscopy /
- melt structure /
- crystallization
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图 1 2个样品在Ab-An-Di三元相图中的位置(等值线单位为℃)
Fig. 1. Positions of two samples in Ab-An-Di ternary phase diagram
图 2 Ab10An29Di61样品的升温Raman光谱
Fig. 2. Raman spectra of glass, crystal and melt of Ab10An29Di61
图 3 Ab12An36Di52样品的升温Raman光谱
Fig. 3. Raman spectra of glass, crystal and melt of Ab12An36Di52
图 4 Ab10An29Di61样品在温度298 K高频区解谱图
Fig. 4. Gaussian deconvolution of stretch vibrational band at 298 K of Ab10An29Di61
图 5 Ab10An29Di61样品在温度1 573 K高频区解谱图
Fig. 5. Gaussian deconvolution of stretch vibrational band at 1 573 K of Ab10An29Di61
表 1 硅酸盐熔体的成分和有关参数
Table 1. Silicate melt composition and related parameters
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